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Storm News
[Index][Aussie-Wx] |
Australian Weather Mailing List Archives: Thursday, 8 April 1999 |
From Subject
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001 Bodie_27 at postmaster.co.uk UNISYS site & web browser
002 Jimmy Deguara [jimmyd at ozemail.com.au] Fwd: Tropical cyclones between Australia and Fiji
003 Paul_Mossman at agd.nsw.gov.au Enough to make you scream!
004 Jimmy Deguara [jimmyd at ozemail.com.au] Enough to make you scream!
005 Paul_Mossman at agd.nsw.gov.au Enough to make you scream!
006 Jimmy Deguara [jimmyd at ozemail.com.au] Enough to make you scream!
007 "Terry Bishop" [dymprog at mpx.com.au] Orange Weather.
008 Lindsay [writer at lisp.com.au] In reply to the humour from Jane,..
009 Lindsay [writer at lisp.com.au] Fwd: Re: Tornado Rotation
010 Lindsay [writer at lisp.com.au] RE: Tornado Rotation
011 Lindsay [writer at lisp.com.au] Fwd: Re: Tornado Rotation
012 Lindsay [writer at lisp.com.au] Major rainfall.
013 Jimmy Deguara [jimmyd at ozemail.com.au] Fwd: Re: Tornado Rotation
014 Blair Trewin [blair at met.Unimelb.EDU.AU] Fwd: Re: Tornado Rotation
015 Paul_Mossman at agd.nsw.gov.au Fwd: Re: wHAT WE CAN EXPECT YEAR 2000
016 John Woodbridge [jrw at pixelcom.net] RE: Pigs Squeeling & Tornado Rotation
017 Matt Smith [disarm at braenet.com.au] homebush minimum
018 Blair Trewin [blair at met.Unimelb.EDU.AU] Heavy rain at Nullagine
019 Blair Trewin [blair at met.Unimelb.EDU.AU] homebush minimum
020 Jimmy Deguara [jimmyd at ozemail.com.au] homebush minimum
021 Paul_Mossman at agd.nsw.gov.au Any data available from Gwenda yet?
022 Anthony Cornelius [cyclone at stealth.com.au] Any data available from Gwenda yet?
023 Blair Trewin [blair at met.Unimelb.EDU.AU] Any data available from Gwenda yet?
024 Blair Trewin [blair at met.Unimelb.EDU.AU] Enough to make you scream!
025 Blair Trewin [blair at met.Unimelb.EDU.AU] Fwd: Re: Tornado Rotation
026 Blair Trewin [blair at met.Unimelb.EDU.AU] Fwd: Re: Tornado Rotation
027 "Nandina Morris" [nandina at alphalink.com.au] RE: Tornado Rotation
028 Paul_Mossman at agd.nsw.gov.au Any data available from Gwenda yet?
029 Anthony Cornelius [cyclone at stealth.com.au] Tornado Density
030 Blair Trewin [blair at met.Unimelb.EDU.AU] Yugoslav web site still alive
031 "RODNEY AIKMAN" [raikman at hotmail.com] Tornado Density
032 wbc at ozemail.com.au (Laurier Williams) Any data available from Gwenda yet?
033 "Michael Thompson" [michaelt at ozemail.com.au] RE: Tornado Rotation
034 "Michael Thompson" [michaelt at ozemail.com.au] Fwd: Re: Tornado Rotation
035 "Michael Thompson" [michaelt at ozemail.com.au] Fwd: Re: wHAT WE CAN EXPECT YEAR 2000
036 "Michael Thompson" [michaelt at ozemail.com.au] Fwd: Re: Tornado Rotation
037 "Michael Thompson" [michaelt at ozemail.com.au] Back then
038 "Ben Tichborne" [tich at netaccess.co.nz] NZ weather etc
039 Blair Trewin [blair at met.Unimelb.EDU.AU] RE: Tornado Rotation
040 "Michael Thompson" [michaelt at ozemail.com.au] RE: Tornado Rotation
041 "Michael Thompson" [michaelt at ozemail.com.au] Bangladesh Hailstorm
042 Jimmy Deguara [jimmyd at ozemail.com.au] Bangladesh Hailstorm
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001
From: Bodie_27 at postmaster.co.uk
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To: aussie-weather at world.std.com
Date: Wed, 7 Apr 1999 15:38:36 +0100
Subject: Re: aus-wx: UNISYS site & web browser
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Hey Jimmy..
I've been following the forecast showalter index on UNISYS for about 3
months now, and i wouldn't say that the index figures themselves are of
much use to us, but i find it's uselfull in quickly identifying areas where
storms are possible.. there has not been a time when there have been storms
somewhere, and there wasn't an area of blue (The showalter Values) there..
The mean Relative Humidity between 850-500 makes it allot easier than going
through the levels individualy on the raw data sites too..
The maps are painfully small unless you zoom in on them, i looked around
and found a browser called "opera" that lets you zoom in on webpages up to
1000%.. takes the hassle out of saving the image and doing this in a
graphics program and whatnot.. you can download it from here:
http://tucows.kewl.com.au/web95.html
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002
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Date: Thu, 08 Apr 1999 08:07:20 +1000
To: aussie-weather at world.std.com
From: Jimmy Deguara [jimmyd at ozemail.com.au]
Subject: aus-wx: Fwd: Tropical cyclones between Australia and Fiji
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
I hope others on the list particularly those in Qld can help with this
information request. I wonder who Gary is?? Michael won't be happy with that.
Jimmy Deguara
>From: "Murray Finlayson"
>To:
>Cc:
>Subject: Tropical cyclones between Australia and Fiji
>Date: Wed, 7 Apr 1999 23:52:51 +1000
>X-Mailer: Microsoft Internet Mail 4.70.1155
>
>Hi Gary and Jimmy,
>
>hoping you can help. I am not a storm chaser - far from it!! On the
>contrary in fact.
>
>I am crewing on a 38 foot yacht in the Coffs Harbour to Suva race starting
>on May 15th and am looking for information regarding weather conditions in
>that area for that time of year. I have been through the Australian Severe
>Weather web site, which was useful but only goes as far back as July last
>year.
>
>Any idea where I could get data on the May/June time of year over the last
>10-20 years?
>
>Any advice would be greatly welcomed.
>
>Kind regards,
>Murray Finlayson
----------------------------------------------------------------------------
---------------
Jimmy Deguara
Vice President ASWA
from Schofields, Sydney
e-mail: jimmyd at ozemail.com.au
homepage with Michael Bath
http://www.australiansevereweather.simplenet.com/
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003
From: Paul_Mossman at agd.nsw.gov.au
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To: aussie-weather at world.std.com
Date: Thu, 8 Apr 1999 07:57:32 +1000
Subject: aus-wx: Enough to make you scream!
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Reply-To: aussie-weather at world.std.com
Howdy all. Been a quiet night I see - where is all the email?
Was watching the Today show this morning when Monty Dwyer made me scream!
He deliberately said (just to annoy all us storm freaks) that Darwin was
copping a great storm this morning! Dammn!! Not fair! Its enough to make
you wanna live there!
Paul.
(Currently enjoying the fast life at Port Macquarie ??)
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004
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Date: Thu, 08 Apr 1999 08:44:44 +1000
To: aussie-weather at world.std.com
From: Jimmy Deguara [jimmyd at ozemail.com.au]
Subject: Re: aus-wx: Enough to make you scream!
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Yes. He mentioned that as 7:30pm. And it has been developing for a few
hours into a fairly massive system too. Does that make you feel better. We
will see what happens with this cyclone coming through over the next few days
Jimmy Deguara
At 07:57 8/04/99 +1000, you wrote:
>
>
>Howdy all. Been a quiet night I see - where is all the email?
>
>Was watching the Today show this morning when Monty Dwyer made me scream!
>He deliberately said (just to annoy all us storm freaks) that Darwin was
>copping a great storm this morning! Dammn!! Not fair! Its enough to make
>you wanna live there!
>
>Paul.
>(Currently enjoying the fast life at Port Macquarie ??)
>
>
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> -----------------------jacob at iinet.net.au------------------------------
----------------------------------------------------------------------------
---------------
Jimmy Deguara
Vice President ASWA
from Schofields, Sydney
e-mail: jimmyd at ozemail.com.au
homepage with Michael Bath
http://www.australiansevereweather.simplenet.com/
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005
From: Paul_Mossman at agd.nsw.gov.au
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To: aussie-weather at world.std.com
Date: Thu, 8 Apr 1999 08:59:11 +1000
Subject: Re: aus-wx: Enough to make you scream!
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Hey Jimmy!
One thing that has been interesting, and probably mentioned '00's of times
is the on-appearance of TC's in the Coral sea this year. While the NW
Australian coast has had a bumper year (this is what No. 4 that has
crossed?) we have had only 1 cross at Cairns. What the hell is happening?
Wheres our excitement??
I dont hold much hope with that ex-TC giving us any joy unless its powerful
enough to move that high. And with the high level shear that has been
eating it I doubt it will even go past adelaide - probably sling southwards
and die a quick death. However I noticed this morning another trough
forming to our west dipping down for the gulf areas. With the decent
activity happening there at the moment it may bring us a final summery
burst of supercells! Then again it may give us another decent rain event as
well.
Paul.
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006
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Date: Thu, 08 Apr 1999 09:11:59 +1000
To: aussie-weather at world.std.com
From: Jimmy Deguara [jimmyd at ozemail.com.au]
Subject: Re: aus-wx: Enough to make you scream!
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Hi Paul,
My comments more dwell on the fact that the system itself will bring rain
over this part. High cloud has already been streaming across. We are in the
path of the cloud mass. Really, don't think a high as a system... It is
more a result of cooler air at the surface causing subsidence of the air.
That can easily change, weaken in terms of its influence, re-establish
further south. Remember that the jet stream tend to have more of an impact
of the weather systems especially in the formations of lows. I like the dip
in the cloud mass and also the tightening of the winds in a wind tunnel
effect which causes divergence. We will see what happens anyway but I just
like the fact that the cyclone has weakened dramatically and is heading
towards us.
Jimmy Deguara
At 08:59 8/04/99 +1000, you wrote:
>
>
>Hey Jimmy!
>
>One thing that has been interesting, and probably mentioned '00's of times
>is the on-appearance of TC's in the Coral sea this year. While the NW
>Australian coast has had a bumper year (this is what No. 4 that has
>crossed?) we have had only 1 cross at Cairns. What the hell is happening?
>Wheres our excitement??
>
>I dont hold much hope with that ex-TC giving us any joy unless its powerful
>enough to move that high. And with the high level shear that has been
>eating it I doubt it will even go past adelaide - probably sling southwards
>and die a quick death. However I noticed this morning another trough
>forming to our west dipping down for the gulf areas. With the decent
>activity happening there at the moment it may bring us a final summery
>burst of supercells! Then again it may give us another decent rain event as
>well.
>
>Paul.
>
>
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> -----------------------jacob at iinet.net.au------------------------------
----------------------------------------------------------------------------
---------------
Jimmy Deguara
Vice President ASWA
from Schofields, Sydney
e-mail: jimmyd at ozemail.com.au
homepage with Michael Bath
http://www.australiansevereweather.simplenet.com/
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007
From: "Terry Bishop" [dymprog at mpx.com.au]
To: "Aussie-weather" [aussie-weather at world.std.com]
Subject: aus-wx: Orange Weather.
Date: Thu, 8 Apr 1999 09:57:59 +1000
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Hi All,
A fantastic day for those who like blue sky. No clouds at all.
At 10.00 16C, 70%, 1023, NE/ENE 0-10 Knots.
Terry.
mailto:dymprog at mpx.com.au
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008
Date: Tue, 06 Apr 1999 16:07:46 -0700
From: Lindsay [writer at lisp.com.au]
X-Mailer: Mozilla 3.0 (Win16; I)
To: aussie-weather at world.std.com
Subject: Re: aus-wx: In reply to the humour from Jane,..
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
I must admit Jimmy, i'm a storm watcher rather than a chaser. Then
again, you do get to watch a fair bit of action from here.
Lindsay
Jimmy Deguara wrote:
>
> Hi Jimmy here,
>
>
> I like number 8 - he he he hoo hoo ha ha ha.
>
> Now come on guys - admit it. You must at least relate to some of these
> or you are whimps of storm chasers. It is all in the blood. We cannot
> help it. We are always full of thousands of excuses just to get
> around the same thing and boy are we good at fooling others, even each
> other at times just to get to a storm.
>
> Jimmy Deguara
> -------------------------------------------------------------------------------------------
> Jimmy Deguara
> Vice President ASWA
> from Schofields, Sydney
> e-mail: jimmyd at ozemail.com.au
> homepage with Michael Bath
> http://www.australiansevereweather.simplenet.com/
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009
Date: Tue, 06 Apr 1999 16:19:47 -0700
From: Lindsay [writer at lisp.com.au]
X-Mailer: Mozilla 3.0 (Win16; I)
To: aussie-weather at world.std.com
Subject: Re: aus-wx: Fwd: Re: Tornado Rotation
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Buladelah F5? Do tell Michael.
Lindsay
Michael Thompson wrote:
>
> It kind of fits my theory of population density, it seems tornado siteings
> are driving the statistics.
>
> Imagine if you had a population density in eastern Australia the same as
> England, not only would we have lots more seen, we would have lots more
> damage. Imagine the Bulahdelah F5 in an area as densely populated as the UK.
>
> Michael
>
> -----Original Message-----
> From: Kevin Phyland
> To: aussie-weather at world.std.com
> Date: Monday, 5 April 1999 17:29
> Subject: RE: aus-wx: Fwd: Re: Tornado Rotation
>
> >Hi every1,
> >
> >Actually, I recall vaguely that England has the most tornadoes per sq.
> >km. (believe it or not, Ripley!)
> >
> >Kevin from Wycheproof.
> >
> >
> >>From: "truffles at xenon.net"
> >>Reply-To: aussie-weather at world.std.com
> >>To: "'aussie-weather at world.std.com'"
> >>Subject: RE: aus-wx: Fwd: Re: Tornado Rotation
> >>Date: Mon, 5 Apr 1999 11:55:02 +-1000
> >>
> >>Hi all!
> >>
> >>As far as the percentages go, I recall info from a documentary, giving
> >the breakup as - the US with 70% of all tornadoes, with the Bangladesh
> >(forgotten the actual country) area with the next 10%, followed by
> >Australia at 8%, & the remainder split with England and a couple of
> >other small countries..... ???
> >>
> >>rals
> >>Brisbane
> >
> >Get Your Private, Free Email at http://www.hotmail.com
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> > message.
> > -----------------------jacob at iinet.net.au------------------------------
> >
>
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010
Date: Wed, 07 Apr 1999 09:36:55 -0700
From: Lindsay [writer at lisp.com.au]
X-Mailer: Mozilla 3.0 (Win16; I)
To: aussie-weather at world.std.com
Subject: Re: aus-wx: RE: Tornado Rotation
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Reply-To: aussie-weather at world.std.com
Michael,
I'd be interested in your or your fathers reflections on the lack of
snowfalls in Hillend these days compared to "Back Then."
It's a pet interest of mine :-)
Lindsay
Michael Thompson wrote:
>
> Thanks for your comments David, the Hargraves damage would have been in the
> 1930's some time, so we are talking a long way back. Interesting enough my
> in my fathers 15 years at Hill End he said he never saw very large hail. On
> the other hand snowfalls were often heavy, so much more than what seems to
> be the case today.
>
> Hail the size of small watermelons in China ! we are talking serious stuff,
> only a supercell could produce goodies like that.
>
>
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011
Date: Tue, 06 Apr 1999 16:01:58 -0700
From: Lindsay [writer at lisp.com.au]
X-Mailer: Mozilla 3.0 (Win16; I)
To: aussie-weather at world.std.com
Subject: Re: aus-wx: Fwd: Re: Tornado Rotation
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Meteorology Today by C Donald Ahrens, also has a good section and
pictures on Tornados. It's in most libraries, and Dymocks should have
it. I've got the fifth edition. nealry 600 pages of weather, .
Lindsay.
Greg CURTIS wrote:
>
> Apart from the logic in his statement 98% of tornadoes occur in the US
> of A and 2 % occur in oz - this means that tornadoes do not occur
> anywhere else? Not.
>
> The other interesting item in the email was rotation direction.
>
> I am reading a book at the moment called Under the Whirlwind by Jerrine
> & Arjen Verkaik (described at veteran tornado chasers) On page 103 it
> says
>
> About 1% of all tornadoes spin anti cyclonically (counterclockwise
> looking up) Anticyclonic tornadoes are usually weaker, short lived, and
> unlikely to have wall clouds.
>
> BTW This book is not a bad read, and looks at the experiences of a
> number of people who suffered from the 20 April 1996 tornadoes in
> Canada. A lot of detail and interviews and some general severe weather
> stuff as well.
>
> (Available at the Ashgrove library rals)
>
> Greg Curtis
> Brisbane
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012
Date: Tue, 06 Apr 1999 16:11:45 -0700
From: Lindsay [writer at lisp.com.au]
X-Mailer: Mozilla 3.0 (Win16; I)
To: aussie-weather at world.std.com
Subject: Re: aus-wx: Major rainfall.
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For April, Blackheath has had 89mm to 6pm on the 4/4 at my station, more
than we had for all of March.
Lindsay.
Jimmy Deguara wrote:
>
>
And Paul, I was proud of my 70 - 80mm of rain in the past several days.
> Schofields NW Sydney
> Date Rainfall
> Thursday, 1 April 1999 R 0.6
> Friday, 2 April 1999 21.0
>
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013
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Date: Thu, 08 Apr 1999 11:18:08 +1000
To: aussie-weather at world.std.com
From: Jimmy Deguara [jimmyd at ozemail.com.au]
Subject: Re: aus-wx: Fwd: Re: Tornado Rotation
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
This tornado occurred in 1970 1st January
TORNADO, 2800 ACRES AFFECTED, INCREDIBLE DAMAGE..... It levelled an
estimated 1 million or so trees and the damage path at one stage was
estimated to be about 1.6km wide... the infamous 1 mile wide beast.
Here is the account from December AMOS Bulletin which quoted information
from Shanahan 1985 I can't find who wrote the article itself so I cannot
quote the author (Blair)
" The most dramatic event of the period was the Bulahdelah tornado. This
tornado, according to Shanahan (1985) the most intense documented in the
Australian meteorological litereature, struch the Bulahdelah State Forest
in the early afternoon, leaving a swathe 22 kilometetres long and up to
1.6km wide, and destrying an estimated 1 million trees. The path of the
storm crossed an unpopulated area, preventing any loss of life. Severe
thunderstorms and large hail were reported elsewhere along the northern NSW
coast, and a house was blown from its foundations at Fredrickton, near
Kempsey...."
It occurred on a typical system that brought cold air and snow falls the
day after down to 1200m in the Snowys.
Gee I wish I was chasing that day!!!! I was only 3 but someone could have
driven me there.....
If people recall the system (which I have discussed) that eventually lead
to the Sydney 1994 bushfires had similarities to this 1970 system as on the
26th December 1993, supercells developed near Wyong and one further to the
N. The Wyong event produced hail to a depth of up to half a metres deep!!!
Here is a link to the storm from 70km away (yes I know I have showed it
before) and yes I did mention that it was using a 28mm wide angle lens and
still took two photos to fit the beast. I bet there was a little bit of a
jetstream that day.
With this URL you can change the number at the end if you wish to view all
the photos that day the numbers range from 01 to 11
The interesting photos are the last 5 or so ie jd07, jd08, jd09, jd10, jd11
http://www.australiansevereweather.simplenet.com/photography/photos/1993/122
6jd01.jpg
At 16:19 6/04/99 -0700, you wrote:
>Buladelah F5? Do tell Michael.
>
>
>
>Lindsay
>
>Michael Thompson wrote:
>>
>> It kind of fits my theory of population density, it seems tornado siteings
>> are driving the statistics.
>>
>> Imagine if you had a population density in eastern Australia the same as
>> England, not only would we have lots more seen, we would have lots more
>> damage. Imagine the Bulahdelah F5 in an area as densely populated as the UK.
>>
>> Michael
>>
>> -----Original Message-----
>> From: Kevin Phyland
>> To: aussie-weather at world.std.com
>> Date: Monday, 5 April 1999 17:29
>> Subject: RE: aus-wx: Fwd: Re: Tornado Rotation
>>
>> >Hi every1,
>> >
>> >Actually, I recall vaguely that England has the most tornadoes per sq.
>> >km. (believe it or not, Ripley!)
>> >
>> >Kevin from Wycheproof.
>> >
>> >
>> >>From: "truffles at xenon.net"
>> >>Reply-To: aussie-weather at world.std.com
>> >>To: "'aussie-weather at world.std.com'"
>> >>Subject: RE: aus-wx: Fwd: Re: Tornado Rotation
>> >>Date: Mon, 5 Apr 1999 11:55:02 +-1000
>> >>
>> >>Hi all!
>> >>
>> >>As far as the percentages go, I recall info from a documentary, giving
>> >the breakup as - the US with 70% of all tornadoes, with the Bangladesh
>> >(forgotten the actual country) area with the next 10%, followed by
>> >Australia at 8%, & the remainder split with England and a couple of
>> >other small countries..... ???
>> >>
>> >>rals
>> >>Brisbane
>> >
>> >Get Your Private, Free Email at http://www.hotmail.com
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>> > message.
>> > -----------------------jacob at iinet.net.au------------------------------
>> >
>>
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>
>
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Jimmy Deguara
Vice President ASWA
from Schofields, Sydney
e-mail: jimmyd at ozemail.com.au
homepage with Michael Bath
http://www.australiansevereweather.simplenet.com/
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014
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Fwd: Re: Tornado Rotation
To: aussie-weather at world.std.com
Date: Thu, 8 Apr 1999 11:31:29 +1000 (EST)
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>
> This tornado occurred in 1970 1st January
>
> TORNADO, 2800 ACRES AFFECTED, INCREDIBLE DAMAGE..... It levelled an
> estimated 1 million or so trees and the damage path at one stage was
> estimated to be about 1.6km wide... the infamous 1 mile wide beast.
>
> Here is the account from December AMOS Bulletin which quoted information
> from Shanahan 1985 I can't find who wrote the article itself so I cannot
> quote the author (Blair)
I wrote this account (it's a regular column). Shanahan is the best
reference. It's a Meteorological Note (a Bureau publication), so it
probably won't be easy to find outside the Bureau library system, but
I'd expect the regional offices will all have a copy.
> " The most dramatic event of the period was the Bulahdelah tornado. This
> tornado, according to Shanahan (1985) the most intense documented in the
> Australian meteorological litereature, struch the Bulahdelah State Forest
> in the early afternoon, leaving a swathe 22 kilometetres long and up to
> 1.6km wide, and destrying an estimated 1 million trees. The path of the
> storm crossed an unpopulated area, preventing any loss of life. Severe
> thunderstorms and large hail were reported elsewhere along the northern NSW
> coast, and a house was blown from its foundations at Fredrickton, near
> Kempsey...."
>
> It occurred on a typical system that brought cold air and snow falls the
> day after down to 1200m in the Snowys.
Many stations in the region roughly defined by the Murray-Darling
basin recorded their lowest January maximum on this day.
> Gee I wish I was chasing that day!!!! I was only 3 but someone could have
> driven me there.....
Wouldn't have helped me much - I hadn't been born. (I did, however,
make my appearance - just - in time for Canberra's lowest minimum on
record, -10.0 on 11 July 1971).
It's interesting that several recent decades have got off to a
meteorologically spectacular start - 1970 was the best of them, but
1960 (the real Australian record high at Oodnadatta on the 3rd, and
a major cold outbreak in SW WA), 1980 (heavy rain and flooding in
SE Australia after a hot late December) and 1990 (extreme heat in
southern NSW and northern Victoria on the 3rd) weren't bad either -
to say nothing of 1900 (the New Year period of 1900 is one of only
5 instances of 3 consecutive 40+ days at Melbourne, and Nhill reached
46 C on 31 December 1899). What can we expect in 2000?
Blair Trewin
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015
From: Paul_Mossman at agd.nsw.gov.au
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To: aussie-weather at world.std.com
Date: Thu, 8 Apr 1999 11:50:30 +1000
Subject: Re: aus-wx: Fwd: Re: wHAT WE CAN EXPECT YEAR 2000
Sender: aussie-weather-approval at world.std.com
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Blair :- Its gunna be supercell & Tornado year!! The BOM better get some
sort of Tornado warning ready now!
Regards, Paul.
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016
From: John Woodbridge [jrw at pixelcom.net]
To: "'aussie-weather at world.std.com'" [aussie-weather at world.std.com]
Subject: RE: aus-wx: RE: Pigs Squeeling & Tornado Rotation
Date: Thu, 8 Apr 1999 11:51:36 +1000
Organization: Pixel Components
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Hi David & others,,
Sorry, I couldn't help it, this tickled my sense of humour...
Hey, maybe we could all have a couple pigs in our backyards with a
microphone to record the volume of squeeling as an indicator of storm
severity...
Seriously...
I have an Time/Life "Earth" book, published in 1962 which mentions that the
USA gets about 150 Tornadoes per year. I also have a Time/Life "Storm"
book, published in 1982 which mentions that the USA gets around 640
Tornadoes per year. So one can assume that the 4 fold apparent increase
over a 20 year period is due to the increased population, better
intelligence via doppler radar etc., increased public awareness, etc..
The latter book states that the U.K. reports about 60 tornadoes per year
(which given the small size of the U.K. is certainly noteworthy, albeit
that they are 'coldies'), 10 tornadoes per year on average recorded over a
25 year period for Italy (!!) and that Australia reports an average of 14.6
(the .6 must have been a willy willy, he he) but it does go onto mention
that the figure for Australia may be low because of the sparseness of the
population, ho hum.
Other stats mentioned in this erstwhile publication are that over a 30 year
period the continental U.S. reported a total of 19,312 tornadoes. In the
peak month of May an average of 5 tornadoes per day clobber the place, and
that over the last 50 years, approx 9,000 good folks have been wasted by
these things.
I guess the question as to what is a genuine "tornado" arises. My
understanding is that it is a member of a family of vortex structures which
range from small dust devils (willy willy;s in W.A. parlance), through
waterspouts, landspouts, gustnadoes, to F5 monsters (I exclude tropical
cyclones, which I have seen included in this group, for structural
reasons). They all have some things in common, which include normal
direction of rotation (99% being anticlockwise in the Northern hemisphere
and Clockwise in the southern), ground level inflow, rotating updraft,
etc.. My guess is that strength basically relates to diameter and rate of
updraft acceleration. The latter is dependent on many factors such as
lapse rates, upper level divergence, shear, etc.. A really decent
supercell thunderstorm hosts the most violent updrafts & hence given the
right conditions, can spawn the strongest tornadoes.
But we shouldn't discount other agents. I have seen small willy willy's in
Perth's suburbs with diameters of 10m and debris height to 50m easily pull
4" branches off street trees, take iron sheets off roofs and rip flyscreen
doors off their hinges. These are a frequent daily occurrence in summer (I
would guess 1 per sq km), usually just preceeding the arrival of the sea
breeze (I'm not suggesting these are tornadoes). Going further in-land to
the wheatbelt area, I have seen massive willy willy's with diameters 50+m
and debris heights many hundreds of meters. These things at a distance
appear as stationary pillars in a cloudless sky. They are easily able to
uproot trees and demolish outbuildings (I am suggesting that these might be
considered tornadoes). Similar levels of damage can occur with gustnadoes,
waterspouts moving in-land etc..
Not sure where I am going with all this, but it sure is a good rave...
If we were to say that a tornado is any vortex capable of producing F0 or
better (worse??) damage, then my guess is that Australia has at least 250
per year. If we were to say that a tornado is only a vortex associated
with the main updraft of a rotating supercell, then it probably may well be
less than 25 per year.
Jrw.
>Snip
the south inland side of China. He was a
vet over there and mentioned to me some big
hail (in the small watermelon category)
storms in that area some of which killed
pigs b4 the locals got a chance - around
four storms per year he said would produce
smaller hail around golfball size which
would get the pigs squeeling but didn't do
too much damage. He said tornadoes occured
but not that often
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017
X-Sender: disarm at braenet.com.au (Unverified)
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Date: Thu, 08 Apr 1999 12:19:28 +1000
To: aussie-weather at world.std.com
From: Matt Smith [disarm at braenet.com.au]
Subject: aus-wx: homebush minimum
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Hi Everyone
I was looking at the "current temps" on the BoM page late last night around
12-1am and saw that it was 6.2 degrees at Homebush, yet at 11pm it was
around 11 degree's, i just checked the 9am NSW weather bulletin on the BoM
page and apparently it got down to -8,.. obviously some faulty equipment i
imagine, would have been great if it were true though !!
Matt Smith
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018
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Heavy rain at Nullagine
To: aussie-weather at world.std.com
Date: Thu, 8 Apr 1999 12:15:46 +1000 (EST)
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>
> Where's Nullagine?
>
> I've just written this up for the Aust Weather News, and I didn't see
> any comment on it on aussie-wx. It's datelined 27 March:
>
> >An area of storms which developed late last night brought heavy rain to the Pilbara region of Western Australia this morning.
> >Nullagine Post Office, 200km southeast of Port Hedland, reported 192mm in the 24 hours to 9am, most of which would have fallen
> >after midnight. If confirmed, this would be Nullagine's heaviest daily rainfall since records began in 1897, the previous highest fall
> >being 153.2mm. Other heavy falls were Carlindi Station, 70km ESE of Port Hedland with 112mm and Yarrie Station, 170km ESE of
> >Port Hedland, with 86mm.
>
> The surrounding falls, and the mass of rapidly developing high-topped
> cloud in the region on the IR satpix at the time give some credence to
> this figure. Any ideas, Blair?
I'm just catching up with mail after a week away.
While the picture will be a bit clearer once the non-real-time stations
come in, I see no reason to doubt the Nullagine figure, given the
other 80+ falls and the meteorological situation. (I am surprised
their previous record was as low as 153, although Nullagine is a bit
far inland to get the really serious action from tropical cyclones).
Blair
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019
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: homebush minimum
To: aussie-weather at world.std.com
Date: Thu, 8 Apr 1999 12:18:04 +1000 (EST)
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>
> Hi Everyone
>
> I was looking at the "current temps" on the BoM page late last night around
> 12-1am and saw that it was 6.2 degrees at Homebush, yet at 11pm it was
> around 11 degree's, i just checked the 9am NSW weather bulletin on the BoM
> page and apparently it got down to -8,.. obviously some faulty equipment i
> imagine, would have been great if it were true though !!
>
> Matt Smith
One of the occupational hazards of AWSs - Mangrove Mountain recorded
a couple of -30s a few days ago. One of my jobs in my current project
at the Bureau is to try to get these types of 'observations' out of
the system before they get too close to the public eye...
-8 in the Sydney region isn't completely fanciful though - it
happened at Richmond in July 1970.
Blair Trewin
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020
X-Sender: jimmyd at pop.ozemail.com.au
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Date: Thu, 08 Apr 1999 12:31:33 +1000
To: aussie-weather at world.std.com
From: Jimmy Deguara [jimmyd at ozemail.com.au]
Subject: Re: aus-wx: homebush minimum
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Yes, people in our area have mentioned so much of that winter (1970). The
water pipes burst many times in the market gardens and also froze. Outside
pipes also froze in households that were exposed to the cold and so had no
water during the mornings. There were many, many minimums in the negatives
that winter but that was the cold one -8.3C..
Jimmy Deguara
At 12:18 8/04/99 +1000, you wrote:
>>
>> Hi Everyone
>>
>> I was looking at the "current temps" on the BoM page late last night around
>> 12-1am and saw that it was 6.2 degrees at Homebush, yet at 11pm it was
>> around 11 degree's, i just checked the 9am NSW weather bulletin on the BoM
>> page and apparently it got down to -8,.. obviously some faulty equipment i
>> imagine, would have been great if it were true though !!
>>
>> Matt Smith
>One of the occupational hazards of AWSs - Mangrove Mountain recorded
>a couple of -30s a few days ago. One of my jobs in my current project
>at the Bureau is to try to get these types of 'observations' out of
>the system before they get too close to the public eye...
>
>-8 in the Sydney region isn't completely fanciful though - it
>happened at Richmond in July 1970.
>
>Blair Trewin
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Jimmy Deguara
Vice President ASWA
from Schofields, Sydney
e-mail: jimmyd at ozemail.com.au
homepage with Michael Bath
http://www.australiansevereweather.simplenet.com/
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021
From: Paul_Mossman at agd.nsw.gov.au
X-Lotus-Fromdomain: NSW_AG
To: aussie-weather at world.std.com
Date: Thu, 8 Apr 1999 12:36:50 +1000
Subject: Re: aus-wx: Any data available from Gwenda yet?
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Can you help Blair?
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022
Date: Thu, 08 Apr 1999 13:19:09 +1000
From: Anthony Cornelius [cyclone at stealth.com.au]
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Subject: Re: aus-wx: Any data available from Gwenda yet?
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Paul - Try http://www.abc.com.au they have news reports that sometimes
have figures. They also archive some wx reports, they've got a pile of
stuff on TC Vance! Just goto the "Weather" section or for Gwenda, some
of the latest info will be in 'top stories.' They (news reports) also
tell you what colour alerts areas are on, so this may be useful at
times, as I know there's been many a time when I've wondered what type
of alert an area is on.
As for the official figures...not sure. But apparently, Port Hedland
was litterally unscathed.
Anthony Cornelius
Paul_Mossman at agd.nsw.gov.au wrote:
>
> Can you help Blair?
>
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023
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Any data available from Gwenda yet?
To: aussie-weather at world.std.com
Date: Thu, 8 Apr 1999 14:35:16 +1000 (EST)
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>
>
>
> Can you help Blair?
>
I don't know anything (yet) that isn't either on the Bureau external
web page or in the media. In particular, the hourly METAR reports
aren't archived centrally (which means I can't access them easily),
so Laurier probably has a better idea of peak winds than I do.
The bits I can confirm are that:
- Port Hedland came out basically unscathed. Gwenda weakened
considerably before landfall (it made landfall as a Category 2)
and also turned east. It crossed the coast about 60km east of
Port Hedland and has stalled since. Most models seem to suggest it
will decay in the Pilbara with no significant impact on southern WA
(perhaps a few millimetres here and there, but nothing like Vance or
even Elaine).
- Port Hedland got 132mm, and there were falls of up to 180 in the
region.
- the most interesting aspect of the cyclone was how relatively cold
the temperatures in it were. Port Hedland was at 19-20 degrees for
most of yesterday and ended up with a max of 21, an April record low
by some margin. (25 is more characteristic of tropical cyclones).
Newman was at 15 (with rain) at 0900 today (after a max of 18
yesterday) and could well be looking at another max in the teens
today. (21 is notably cool for Port Hedland even in winter; the town
averages only about 0.6 days/year with maxima < 20).
Judging by the WA Main Roads web site, there doesn't seem to be much
flooding yet. This may change, especially if there's further rain
today.
Blair Trewin
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024
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Enough to make you scream!
To: aussie-weather at world.std.com
Date: Thu, 8 Apr 1999 14:38:08 +1000 (EST)
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>
>
>
> Howdy all. Been a quiet night I see - where is all the email?
>
> Was watching the Today show this morning when Monty Dwyer made me scream!
> He deliberately said (just to annoy all us storm freaks) that Darwin was
> copping a great storm this morning! Dammn!! Not fair! Its enough to make
> you wanna live there!
Darwin recorded 85mm to the 24 hours to 0900, 84mm of which fell in
the 3 hours between 0600 and 0900, so it must have been quite
impressive.
Blair Trewin
(who couldn't resist a smile when the 'Advocate' in Tasmania referred
to a 'deluge' on Monday which brought Devonport 5mm in 10 minutes. In
Darwin that's drizzle).
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025
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Fwd: Re: Tornado Rotation
To: aussie-weather at world.std.com
Date: Thu, 8 Apr 1999 14:40:50 +1000 (EST)
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>
> Buladelah F5? Do tell Michael.
>
>
As mentioned earlier on this thread, this was written up in the AMOS
Bulletin (in December 1996 IIRC).
The tornado went through an area of the Bulahdelah State Forest on
the afternoon on January 1, 1970. From damage surveys it was confirmed
as being at least an F4, possibly an F5. Fortunately it came nowhere
near any population centre.
There was a Meteorological Note written on the subject in 1985, and
it was also discussed in a book on Australian tornadoes, whose title
I have forgotten.
Blair Trewin
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026
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Fwd: Re: Tornado Rotation
To: aussie-weather at world.std.com
Date: Thu, 8 Apr 1999 14:46:59 +1000 (EST)
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>
> This is a multi-part message in MIME format.
>
> ------=_NextPart_000_0016_01BE8056.F3D33300
> Content-Type: text/plain;
> charset="iso-8859-1"
> Content-Transfer-Encoding: quoted-printable
>
> Hi Les
>
> Unfortunately our BOM most senior staff are seeing the UK Met Office =
> as an example to follow. New Zealand is also another ideal that our =
> present government looks too.
>
It's probably more accurate to say that the present government and
elements within the bureaucracy look to the UK and NZ as ideals.
Those who were at the opening day of the AMOS conference will have
heard speeches by Roger Beale (head of the Department of the
Environment and Heritage, the Bureau's parent department) and John
Zillman (the Bureau director). Essentially Roger Beale was very much
in favour of further commercialisation and John Zillman got stuck into
those views in no uncertain manner. I'm printing both speeches in
full in the April AMOS Bulletin (including the bits that John Zillman
ran out of time to say, which are considerably more controversial
than anything he did say) - all the more reason to join up :-)
I don't think we'll see an NZ-style dismemberment of the Bureau as
long as the Nationals are in the Coalition (the last time this was
threatened was in the infamous 'Fightback' in 1993), but there is
certainly pressure for some form of commercialisation.
Blair Trewin
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027
To: aussie-weather at world.std.com
From: "Nandina Morris" [nandina at alphalink.com.au]
Subject: Re: aus-wx: RE: Tornado Rotation
Date: Thu, 08 Apr 99 15:05:55 PDT
Sender: aussie-weather-approval at world.std.com
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Lindsay - I gotta tell you - nuffin's the same as 'back then!
Cheers,
Nandina
nandina at alphalink.com.au
----------
> Michael,
>
> I'd be interested in your or your fathers reflections on the lack of
> snowfalls in Hillend these days compared to "Back Then."
>
> It's a pet interest of mine :-)
>
>
> Lindsay
>
> Michael Thompson wrote:
> >
> > Thanks for your comments David, the Hargraves damage would have been in the
> > 1930's some time, so we are talking a long way back. Interesting enough my
> > in my fathers 15 years at Hill End he said he never saw very large hail. On
> > the other hand snowfalls were often heavy, so much more than what seems to
> > be the case today.
> >
> > Hail the size of small watermelons in China ! we are talking serious stuff,
> > only a supercell could produce goodies like that.
> >
> >
>
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028
From: Paul_Mossman at agd.nsw.gov.au
X-Lotus-Fromdomain: NSW_AG
To: aussie-weather at world.std.com
Date: Thu, 8 Apr 1999 15:14:32 +1000
Subject: Re: aus-wx: Any data available from Gwenda yet?
Sender: aussie-weather-approval at world.std.com
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Thankyou Blair. I dont have access to internet at work - thats why I ask.
Paul.
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029
Date: Thu, 08 Apr 1999 15:26:40 +1000
From: Anthony Cornelius [cyclone at stealth.com.au]
X-Mailer: Mozilla 4.5 [en] (Win98; I)
X-Accept-Language: en
To: aussie-weather at world.std.com
Subject: Re: aus-wx: Tornado Density
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Hi all + John,
> Not sure where I am going with all this, but it sure is a good rave...
>
> If we were to say that a tornado is any vortex capable of producing F0 or
> better (worse??) damage, then my guess is that Australia has at least 250
> per year. If we were to say that a tornado is only a vortex associated
> with the main updraft of a rotating supercell, then it probably may well be
> less than 25 per year.
>
> Jrw.
I think I'd have to disagree with you here mate...if we did include all
vorticies capable of F0 damage or greater, I'm fairly sure we'd be in
the 1000's. Dust devils are certainly very common, and many can give F0
damage (remembering that F0 really is very weak starting at B8<62km/h>)
and that the definition of a B8 wind is small twigs breaking off
trees/shrubs. I've witnessed a dust devil to cause "F0 damage" at 36C,
so one could assume that as a *general rule of thumb* there would be
many others, especially in the 'outback.' I think almost everyone I've
talked to who as gone 'out west' has said they've seen a dust devil.
Dust devils can be very strong though, they have caused near F3 damage
before!
As for tornadoes...Ira (from Perth) was telling me that there have been
250 tornado tracks (8.3 a year on average) in WA over the past 30
years. This is quite significant really, when you consider that there
are a multitude of tornadoes that go unreported! Most of the tornadoes
that occur in WA (in particular the SW corner) occur from the strong
cold frontal systems that pass through in winter. Tasmania also gets
many strong cold fronts, and one would wonder how many frontal/squall
line tornadoes they receive in a year. And then in summer, NE NSW/SE
QLD and into central QLD at times, right down the east coast ... this is
probably the largest unknown in my opinion. One can only begin to
imagine how many actually occur, I've sat down a countless number of
times looking at sat pics and think
"holy s$$t I wonder what's happening there!" when seeing huge
thunderstorms on sat pics. As I said in a previous email, I believe
that 300-400 tornadoes a year in Australia would be my approximate
estimate. You also mentioned about the definition of a tornado, here is
the best definition that I could find (From "Significant Tornadoes" by
Thomas P. Grazulis: "A tornado is a violently rotating column of air, a
vortex, spawned by a thhunderstom, in contact with both the thundercloud
and the ground, often accompanied by a funnel shaped cloud, progressing
over the land in a narrow path. The damage pattern usually shows the
convergent swirling winds, but can be very complex after the formation
of multiple vorticies. The damage pattern may show no convergence at
all if the tornado is moving forward at speed equal to the speed of
rotation, or if the axis of rotation is tilted." It then goes on to say
" This definition does now allow fire whirls, most waterspouts or dust
devils to be called tornadoes" I would assume "most waterspous" is
there because some thunderstorms form tornadoes over water (called
'tornadic waterpouts' for obvious reasons) This implies that a
supercell doesn't have to have to be present for a tornado, and would
thus allow "frontal/squall line tornadoes" to be in the definition.
Any thoughts anyone? Any other estimates?
Anthony Cornelius
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030
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: aus-wx: Yugoslav web site still alive
To: aussie-weather at world.std.com (Aussie Weather)
Date: Thu, 8 Apr 1999 16:23:11 +1000 (EST)
X-Mailer: ELM [version 2.4 PL23]
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
I was somewhat surprised to find that one of the better European
meteorological office web sites, the Yugoslav one, is still alive and
well. Perhaps they want to give NATO some help on where to drop their
bombs?
(It's at http://www.meteo.yu, and is one of the few places around
where you can find model output - pressure and precipitation - for
Europe on the web).
Blair Trewin
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031
X-Originating-Ip: [203.43.44.180]
From: "RODNEY AIKMAN" [raikman at hotmail.com]
To: aussie-weather at world.std.com
Subject: Re: aus-wx: Tornado Density
Date: Thu, 08 Apr 1999 00:03:29 PDT
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Hi Anthony
I feel that this is the best tornado definition that I have
come across. Nature is often to untidy to be making distinctions
between various types of 'funnels'; the same would apply to the
thundestorm / moist convection systems spawning them.
Rod Aikman
Bendigo
>From: Anthony Cornelius
>Reply-To: aussie-weather at world.std.com
>To: aussie-weather at world.std.com
>Subject: Re: aus-wx: Tornado Density
>Date: Thu, 08 Apr 1999 15:26:40 +1000
>
>Hi all + John,
>
>
>> Not sure where I am going with all this, but it sure is a good
rave...
>>
>> If we were to say that a tornado is any vortex capable of producing
F0 or
>> better (worse??) damage, then my guess is that Australia has at
least 250
>> per year. If we were to say that a tornado is only a vortex
associated
>> with the main updraft of a rotating supercell, then it probably may
well be
>> less than 25 per year.
>>
>> Jrw.
>
>I think I'd have to disagree with you here mate...if we did include
all
>vorticies capable of F0 damage or greater, I'm fairly sure we'd be in
>the 1000's. Dust devils are certainly very common, and many can give
F0
>damage (remembering that F0 really is very weak starting at
B8<62km/h>)
>and that the definition of a B8 wind is small twigs breaking off
>trees/shrubs. I've witnessed a dust devil to cause "F0 damage" at
36C,
>so one could assume that as a *general rule of thumb* there would be
>many others, especially in the 'outback.' I think almost everyone
I've
>talked to who as gone 'out west' has said they've seen a dust devil.
>Dust devils can be very strong though, they have caused near F3
damage
>before!
>
>As for tornadoes...Ira (from Perth) was telling me that there have
been
>250 tornado tracks (8.3 a year on average) in WA over the past 30
>years. This is quite significant really, when you consider that
there
>are a multitude of tornadoes that go unreported! Most of the
tornadoes
>that occur in WA (in particular the SW corner) occur from the strong
>cold frontal systems that pass through in winter. Tasmania also gets
>many strong cold fronts, and one would wonder how many frontal/squall
>line tornadoes they receive in a year. And then in summer, NE NSW/SE
>QLD and into central QLD at times, right down the east coast ... this
is
>probably the largest unknown in my opinion. One can only begin to
>imagine how many actually occur, I've sat down a countless number of
>times looking at sat pics and think
>"holy s$$t I wonder what's happening there!" when seeing huge
>thunderstorms on sat pics. As I said in a previous email, I believe
>that 300-400 tornadoes a year in Australia would be my approximate
>estimate. You also mentioned about the definition of a tornado, here
is
>the best definition that I could find (From "Significant Tornadoes"
by
>Thomas P. Grazulis: "A tornado is a violently rotating column of air,
a
>vortex, spawned by a thhunderstom, in contact with both the
thundercloud
>and the ground, often accompanied by a funnel shaped cloud,
progressing
>over the land in a narrow path. The damage pattern usually shows the
>convergent swirling winds, but can be very complex after the
formation
>of multiple vorticies. The damage pattern may show no convergence at
>all if the tornado is moving forward at speed equal to the speed of
>rotation, or if the axis of rotation is tilted." It then goes on to
say
>" This definition does now allow fire whirls, most waterspouts or
dust
>devils to be called tornadoes" I would assume "most waterspous" is
>there because some thunderstorms form tornadoes over water (called
>'tornadic waterpouts' for obvious reasons) This implies that a
>supercell doesn't have to have to be present for a tornado, and would
>thus allow "frontal/squall line tornadoes" to be in the definition.
>
>Any thoughts anyone? Any other estimates?
>
>Anthony Cornelius
>
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032
From: wbc at ozemail.com.au (Laurier Williams)
To: aussie-weather at world.std.com
Subject: Re: aus-wx: Any data available from Gwenda yet?
Date: Thu, 08 Apr 1999 07:21:56 GMT
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On Thu, 8 Apr 1999 14:35:16 +1000 (EST), Blair Trewin
wrote:
>I don't know anything (yet) that isn't either on the Bureau external
>web page or in the media. In particular, the hourly METAR reports
>aren't archived centrally (which means I can't access them easily),
>so Laurier probably has a better idea of peak winds than I do.
>
I'll have the Port Hedland METARs, Blair, but as they're not in the
standard AWS format, I'll have to manually extract them from the day's
file. The 3-hourly SYNOPS from Port Hedland are fairly uneventful:
7th 1200 WST wind 120 degrees/23 knots, temp 19.3 bar 1006.0 24mm in 3
hours
7th 1500 130/22 19.3 1003.9 25/3
7th 1800 140/22 19.4 1003.5 12/3
7th 2100 140/33 19.5 1002.1 25/3
8th 0000 150/40 18.4 997.7 30/3
8th 0300 160/26 18.2 1000.1 16/3
METARs from main Aussie centres are available for the past 24 hours
from http://www-das.uwyo.edu/surface/sfctime.html -- you key in the
four-letter aviation code for the location and can get a text list
like that below (only more nicely formatted), or a meteogram. What's
available for Port Hedland (YPPD) is this. Times are UTC, temp and dew
point Fahrenheit, barometer is shown as ALT, visibility in miles. R+
is heavy rain.
ID TIME T TD RH DIR SPD GST ALT SLP VIS CIL COV WX MAX MIN PR6
PR24 SC
YPPD 0459 66 64 94 120 23 33 968 2.5 70 OVC R
YPPD 0553 66 66 100 120 22 35 965
YPPD 0700 66 66 100 130 22 32 962 2.5 70 OVC R
YPPD 0855 66 66 100 130 22 32 962 2.5 70 OVC R
YPPD 1000 66 66 100 140 22 962 4 10 SCT R-
YPPD 1100 68 66 94 140 25 959 5 10 SCT R-
YPPD 1200 68 66 94 130 27 959 2.5 10 SCT R
YPPD 1253 68 66 94 130 30 43 959 1.2 15 BKN R+
YPPD 1400 66 66 100 140 35 46 956 4 10 OVC R-
YPPD 1500 66 66 100 140 38 52 950 1.9 15 OVC R
YPPD 1600 64 64 100 150 40 51 945 0.9 15 BKN R+
YPPD 1655 64 64 100 150 37 49 947 1.9 15 BKN R
YPPD 1800 64 64 100 150 35 48 950 90 BKN
YPPD 1900 64 63 94 160 25 35 953 6 22 BKN L-
YPPD 2000 64 63 94 170 20 953 22 BKN
YPPD 2100 64 63 94 170 20 959 18 BKN
YPPD 2200 66 63 88 170 16 962 10 BKN
YPPD 2300 66 63 88 170 16 965 10 BKN L-
YPPD 0000 66 63 88 160 16 965 10 BKN
YPPD 0100 66 63 88 150 16 968 15 BKN
YPPD 0200 66 64 94 160 15 971 15 BKN
YPPD 0300 68 63 83 150 16 968 15 BKN
YPPD 0400 70 64 83 150 14 968 15 BKN
YPPD 0500 70 64 83 170 13 968 13 FEW
YPPD 0600 73 64 73 160 13 968 17 BKN
This gives a peak gust of 52 knots sometime between 14 and 15z or 2200
to 2300 WST, and a minimum barometer of 994.5 (not 945!) at midnight
WST.
It's possible my data has more SPECI observations of interest, so I'll
look through it and report back.
--
Laurier Williams
Australian Weather Links and News
http://www.ozemail.com.au/~wbc/
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033
From: "Michael Thompson" [michaelt at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: Re: aus-wx: RE: Tornado Rotation
Date: Thu, 8 Apr 1999 17:54:51 +1000
X-Mailer: Microsoft Outlook Express 4.72.3110.1
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He is 70 so he has a wealth of memory, I will ask him about some more
notable events.
One that I do not share belief in is that he swears blind that it snowed one
Christmas Day at Hill End, I first heard this story about 30 years ago, and
he brings it up every now and then.
Michael
-----Original Message-----
>Michael,
>
>I'd be interested in your or your fathers reflections on the lack of
>snowfalls in Hillend these days compared to "Back Then."
>
>It's a pet interest of mine :-)
>
>
>Lindsay
>
>Michael Thompson wrote:
>>
>> Thanks for your comments David, the Hargraves damage would have been in
the
>> 1930's some time, so we are talking a long way back. Interesting enough
my
>> in my fathers 15 years at Hill End he said he never saw very large hail.
On
>> the other hand snowfalls were often heavy, so much more than what seems
to
>> be the case today.
>>
>> Hail the size of small watermelons in China ! we are talking serious
stuff,
>> only a supercell could produce goodies like that.
>>
>>
>
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034
From: "Michael Thompson" [michaelt at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: Re: aus-wx: Fwd: Re: Tornado Rotation
Date: Thu, 8 Apr 1999 17:56:33 +1000
X-Mailer: Microsoft Outlook Express 4.72.3110.1
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In the 1970's sometime, I know very little myself, but it is a widely know
event. I will see if I can dig up some further info.
Michael
-----Original Message-----
>Buladelah F5? Do tell Michael.
>
>
>
>Lindsay
>
>Michael Thompson wrote:
>>
>> It kind of fits my theory of population density, it seems tornado
siteings
>> are driving the statistics.
>>
>> Imagine if you had a population density in eastern Australia the same as
>> England, not only would we have lots more seen, we would have lots more
>> damage. Imagine the Bulahdelah F5 in an area as densely populated as the
UK.
>>
>> Michael
>>
>> -----Original Message-----
>> From: Kevin Phyland
>> To: aussie-weather at world.std.com
>> Date: Monday, 5 April 1999 17:29
>> Subject: RE: aus-wx: Fwd: Re: Tornado Rotation
>>
>> >Hi every1,
>> >
>> >Actually, I recall vaguely that England has the most tornadoes per sq.
>> >km. (believe it or not, Ripley!)
>> >
>> >Kevin from Wycheproof.
>> >
>> >
>> >>From: "truffles at xenon.net"
>> >>Reply-To: aussie-weather at world.std.com
>> >>To: "'aussie-weather at world.std.com'"
>> >>Subject: RE: aus-wx: Fwd: Re: Tornado Rotation
>> >>Date: Mon, 5 Apr 1999 11:55:02 +-1000
>> >>
>> >>Hi all!
>> >>
>> >>As far as the percentages go, I recall info from a documentary, giving
>> >the breakup as - the US with 70% of all tornadoes, with the Bangladesh
>> >(forgotten the actual country) area with the next 10%, followed by
>> >Australia at 8%, & the remainder split with England and a couple of
>> >other small countries..... ???
>> >>
>> >>rals
>> >>Brisbane
>> >
>> >Get Your Private, Free Email at http://www.hotmail.com
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>> >
>>
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035
From: "Michael Thompson" [michaelt at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: Re: aus-wx: Fwd: Re: wHAT WE CAN EXPECT YEAR 2000
Date: Thu, 8 Apr 1999 18:00:45 +1000
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Yikes, imagine a severe storm hitting the Olympics....not out of season, in
fact any storm at that time of year has to be a hail worry.
Michael
-----Original Message-----
>
>Blair :- Its gunna be supercell & Tornado year!! The BOM better get some
>sort of Tornado warning ready now!
>
>Regards, Paul.
>
>
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036
From: "Michael Thompson" [michaelt at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: Re: aus-wx: Fwd: Re: Tornado Rotation
Date: Thu, 8 Apr 1999 18:14:05 +1000
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Thanks for setting things straight Blair, I too work for the Commonwealth
Gov, ( well sort of, it's being corporatised ), and I just presumed that
the BOm heads are under contract and basically have to toe the government
line or no contract renewal.
I am encouraged by what you said about AMOS conference.
Michael
-----Original Message-----
>> This is a multi-part message in MIME format.
>>
>> ------=_NextPart_000_0016_01BE8056.F3D33300
>> Content-Type: text/plain;
>> charset="iso-8859-1"
>> Content-Transfer-Encoding: quoted-printable
>>
>> Hi Les
>>
>> Unfortunately our BOM most senior staff are seeing the UK Met Office
=
>> as an example to follow. New Zealand is also another ideal that our =
>> present government looks too.
>>
>It's probably more accurate to say that the present government and
>elements within the bureaucracy look to the UK and NZ as ideals.
>
>Those who were at the opening day of the AMOS conference will have
>heard speeches by Roger Beale (head of the Department of the
>Environment and Heritage, the Bureau's parent department) and John
>Zillman (the Bureau director). Essentially Roger Beale was very much
>in favour of further commercialisation and John Zillman got stuck into
>those views in no uncertain manner. I'm printing both speeches in
>full in the April AMOS Bulletin (including the bits that John Zillman
>ran out of time to say, which are considerably more controversial
>than anything he did say) - all the more reason to join up :-)
>
>I don't think we'll see an NZ-style dismemberment of the Bureau as
>long as the Nationals are in the Coalition (the last time this was
>threatened was in the infamous 'Fightback' in 1993), but there is
>certainly pressure for some form of commercialisation.
>
>Blair Trewin
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037
From: "Michael Thompson" [michaelt at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: aus-wx: Back then
Date: Thu, 8 Apr 1999 18:10:15 +1000
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I used to be a firm believer of the "back then" theory, that was until the
last 2 summers. I must be getting old, but here in the southern Illawarra I
have never slept on top of the bed so much as before as the summer of 97/98,
and to a lesser extent this past one.
In fact when I looked at some old records I kept from the 1980's there were
2-3 years were the hottest summer temp was only 30C, mind you I live 1.5km
from the ocean, and 200m from Lake Illawarra's SE shore, therefore a hot NW
has to blow across 5km of lake to reach me.
With severe storms it is easy to fall into the back then, but these last 2
seasons in the Illawarra have been duds.
Michael
-----Original Message-----
Lindsay - I gotta tell you - nuffin's the same as 'back then!
Cheers,
Nandina
nandina at alphalink.com.au
----------
> Michael,
>
> I'd be interested in your or your fathers reflections on the lack of
> snowfalls in Hillend these days compared to "Back Then."
>
> It's a pet interest of mine :-)
>
>
> Lindsay
>
> Michael Thompson wrote:
> >
> > Thanks for your comments David, the Hargraves damage would have been in
the
> > 1930's some time, so we are talking a long way back. Interesting enough
my
> > in my fathers 15 years at Hill End he said he never saw very large hail.
On
> > the other hand snowfalls were often heavy, so much more than what seems
to
> > be the case today.
> >
> > Hail the size of small watermelons in China ! we are talking serious
stuff,
> > only a supercell could produce goodies like that.
> >
> >
>
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> -----------------------jacob at iinet.net.au------------------------------
>
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038
From: "Ben Tichborne" [tich at netaccess.co.nz]
To: [aussie-weather at world.std.com]
Subject: aus-wx: NZ weather etc
Date: Thu, 8 Apr 1999 20:45:44 +1200
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Hello again
Back again after a few months break, and one of NZ's hottest summers ever
- which continued through March (the second hottest March on record). La
Nina was supposed to bring down some tropical cyclones (in the tradition of
Fergus and Drena of 96/97) but we only got Frank, which reached the country
in a much weakened state (but which gave some welcome rain to dry
Canterbury).
Seems like winter cold has already reached parts of Australia in recent
weeks. I'm curious if anyone has heard of any summer snowfalls in the
central tablelands of NSW (Orange, Katoomba etc), if such events have ever
occurred.
Further to the tornado discussion, tornadoes have occurred in most parts
of NZ, but are most common in western areas of the North Island from
Taranaki northwards. These areas are exposed to squally storm systems
coming in from the Tasman Sea.
Such tornadoes cannot rival those in the US, and only rarely have they
caused fatalities, but they still periodically leave a trail of
destruction, if they hit any built up areas.
Ben Tichborne
Christchurch
New Zealand
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039
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: RE: Tornado Rotation
To: aussie-weather at world.std.com
Date: Thu, 8 Apr 1999 18:46:15 +1000 (EST)
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>
> He is 70 so he has a wealth of memory, I will ask him about some more
> notable events.
>
> One that I do not share belief in is that he swears blind that it snowed one
> Christmas Day at Hill End, I first heard this story about 30 years ago, and
> he brings it up every now and then.
Boxing Day 1968? (probably not at Hill End - what elevation is it? -
but possibly on nearby peaks? - numerous Central Tablelands stations
above 900m recorded sub-10 maxima and minima in the 2-4 range).
Blair Trewin
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040
From: "Michael Thompson" [michaelt at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: Re: aus-wx: RE: Tornado Rotation
Date: Thu, 8 Apr 1999 21:54:22 +1000
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Sorry Blair, my 30 year ago reference was referring to when my father first
told me, the actual date would be back when he was a child, around 1930's at
a guess.
Michael
-----Original Message-----
>> He is 70 so he has a wealth of memory, I will ask him about some more
>> notable events.
>>
>> One that I do not share belief in is that he swears blind that it snowed
one
>> Christmas Day at Hill End, I first heard this story about 30 years ago,
and
>> he brings it up every now and then.
>Boxing Day 1968? (probably not at Hill End - what elevation is it? -
>but possibly on nearby peaks? - numerous Central Tablelands stations
>above 900m recorded sub-10 maxima and minima in the 2-4 range).
>
>Blair Trewin
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041
From: "Michael Thompson" [michaelt at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: aus-wx: Bangladesh Hailstorm
Date: Thu, 8 Apr 1999 21:56:36 +1000
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Just heard on ABC radio that a hailstorm in Bangladesh has killed 6 people,
no description of size, nor whether there was tornadoes or not.
Michael Thompson
http://thunder.simplenet.com
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042
X-Sender: jimmyd at pop.ozemail.com.au
X-Mailer: QUALCOMM Windows Eudora Pro Version 4.1
Date: Thu, 08 Apr 1999 21:58:40 +1000
To: aussie-weather at world.std.com
From: Jimmy Deguara [jimmyd at ozemail.com.au]
Subject: Re: aus-wx: Bangladesh Hailstorm
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Probably a supercell... We will see as it is starting to fire in the
Northern Hemisphere
Jimmy Deguara
At 21:56 8/04/99 +1000, you wrote:
>Just heard on ABC radio that a hailstorm in Bangladesh has killed 6 people,
>no description of size, nor whether there was tornadoes or not.
>
>Michael Thompson
>http://thunder.simplenet.com
>
>
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----------------------------------------------------------------------------
---------------
Jimmy Deguara
Vice President ASWA
from Schofields, Sydney
e-mail: jimmyd at ozemail.com.au
homepage with Michael Bath
http://www.australiansevereweather.simplenet.com/
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| Document: 990408.htm
Updated: 13 April 1999 |
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