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Storm News
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Australian Weather Mailing List Archives: Wednesday, 21 July 1999 |
From Subject
--------------------------------------------------------------------------------------
001 "Marty" [martyp at dynamite.com.au] St Elmo's Fire special on telly
002 Lindsay [writer at lisp.com.au] Snow
003 Lindsay [writer at lisp.com.au] Snow
004 Michael Scollay [michael.scollay at telstra.com. Charlotte Pass 3pm Obs of 20/7/1999 suspect...
005 Chas & Helen Osborn [hosborn at tassie.net.au] Strahan Wx
006 "Nick Sykes" [nsykes at labyrinth.net.au] Squalls to 60knots!!!!
007 Chas & Helen Osborn [hosborn at tassie.net.au] Strahan Wx
008 Paul_Mossman at agd.nsw.gov.au Strahan Wx
009 Blair Trewin [blair at met.Unimelb.EDU.AU] Charlotte Pass 3pm Obs of 20/7/1999 suspect...
010 Blair Trewin [blair at met.Unimelb.EDU.AU] Charlotte Pass 3pm Obs of 20/7/1999 suspect...
011 Don White [donwhite at ozemail.com.au] Charlotte Pass 3pm Obs of 20/7/1999 suspect...
012 Michael Bath [mbath at ozemail.com.au] Fwd: cyclone history
013 John Woodbridge [jrw at pixelcom.net] RE: aus-wx July rainfall
--------------------------------------------------------------------------------------
001
From: "Marty" [martyp at dynamite.com.au]
To: "Aussie Weather Mailing List" [aussie-weather at world.std.com]
Subject: aus-wx: St Elmo's Fire special on telly
Date: Wed, 21 Jul 1999 03:11:29 +1000
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Hi folks,
Supernatural is an interesting new television documentary series on the ABC at
8pm AEST on Fridays.
This week's feature is on St Elmo's Fire.
Cheers,
Marty.
Brisbane, Australia
martyp at dynamite.com.au
Images of Canberra: http://www2.dynamite.com.au/martyp
Lightning Photos: http://www2.dynamite.com.au/martyp/lightning
ICQ: 11790565
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002
Date: Wed, 21 Jul 1999 05:55:52 -0700
From: Lindsay [writer at lisp.com.au]
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To: aussie-weather at world.std.com
Subject: Re: aus-wx: Snow
Sender: aussie-weather-approval at world.std.com
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Light sleet/snow here Laurier at 6am Wednesday, - light is the operative
word.
Lindsay
Laurier Williams wrote:
>
> Oops -- my mistake. It filed itself out of view. Doh!
>
> Might get some light snow here at Blackheath tonight. Mt Boyce is
> reporting temps around 3 degrees and falling, with a 15 to 25 knot WSW
> wind. May be enough to let some of the showers that have been falling
> out Oberon way all day drift across here overnight and early morning
> and fall as snow.
>
> Laurier
>
> On Tue, 20 Jul 1999 10:50:15 GMT, wbc at ozemail.com.au (Laurier
> Williams) wrote:
>
> >Oberon reported light snow during today (only 0.6mm in the raingauge,
> >though), and the Bowral observer added a note to the 3pm ob that there
> >had been past sleet. Snow depth at Charlotte Pass is up to 95cm at 3pm
> >today from 80cm yesterday at 9am and 50cm at 9am Sunday, which should
> >make the skiers happier.
> >
> >All the models are bringing a secondary development ENE under Tasmania
> >into the Tasman during Thursday, but vary in what they're doing with
> >colder air aloft. GASP and the EC bring the 536 thickness line right
> >up to middle NSW with 850hPa temps down to -3, though the GASP doesn't
> >have much precipitation forecast. Both US models are more circumspect,
> >though last night's AVN has a very nice little southerly jet shooting
> >up the western side of the surface low. All in all I think the
> >prospect for some snow in Vic and NSW on Thursday is pretty good
> >(which I'm cursing, because I'll be in Sydney...), but I don't think
> >the quantity will be too much.
> >
> >******** Apologies if this comes through twice. I sent it 3 hours ago
> >and it still hasn't shown up on the list *********
>
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003
Date: Wed, 21 Jul 1999 05:52:35 -0700
From: Lindsay [writer at lisp.com.au]
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To: aussie-weather at world.std.com
Subject: Re: aus-wx: Snow
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Sounds good Laurier,
I'll be here, I think. It's Wednesday morning and I've been up since
4:00am.
Light sleet falling in Blackheath with the passing of low, very small
clouds. It's mostly clear skies here though. It's quite beautiful, I'll
look up and there's virtually no cloud but sleet is falling
intermittantly.
It's around 2 degrees.
Lindsay Pearce.
Laurier Williams wrote:
>
> Oberon reported light snow during today (only 0.6mm in the raingauge,
> though), and the Bowral observer added a note to the 3pm ob that there
> had been past sleet. Snow depth at Charlotte Pass is up to 95cm at 3pm
> today from 80cm yesterday at 9am and 50cm at 9am Sunday, which should
> make the skiers happier.
>
> All the models are bringing a secondary development ENE under Tasmania
> into the Tasman during Thursday, but vary in what they're doing with
> colder air aloft. GASP and the EC bring the 536 thickness line right
> up to middle NSW with 850hPa temps down to -3, though the GASP doesn't
> have much precipitation forecast. Both US models are more circumspect,
> though last night's AVN has a very nice little southerly jet shooting
> up the western side of the surface low. All in all I think the
> prospect for some snow in Vic and NSW on Thursday is pretty good
> (which I'm cursing, because I'll be in Sydney...), but I don't think
> the quantity will be too much.
>
> --
> Laurier Williams
> Australian Weather Links and News
> http://www.ozemail.com.au/~wbc/
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> -----------------------jacob at iinet.net.au------------------------------
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004
Date: Wed, 21 Jul 1999 10:29:07 +1000
From: Michael Scollay [michael.scollay at telstra.com.au]
Organization: Telstra Strategy & Research
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To: aussie-weather at world.std.com
Subject: Re: aus-wx: Charlotte Pass 3pm Obs of 20/7/1999 suspect...
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Laurier Williams wrote:
>
> On Tue, 20 Jul 1999 19:11:23 +1000, Keith Barnett
> wrote:
>
> >I wonder if the observer simply omitted a minus sign in front of the 4?
> >
> Quite likely...
[snip]
> Methinks that obs from the ski resorts may sometimes play second
> fiddle to many other activities.
That conclusion confirms that the snow must have been good
I can confirm the 10mm Perisher recorded from our ski lodge
obs that also reported an increased snow-depth on the verandah
from the early birds who cleared some 20cm off from Monday night
to 8:30am. They had to clear another 15-20cm off at 17:00. Given
that the verandah in question is somewhat sheltered, 10mm (say
10cm of snow 9-3) is a reasonable measure.
Problem with snow/rain guages in these conditions are caused by
snow blowing almost horizontal at 30kph. Most seems to eddy
around the guage with the odd flake landing on the heated
surface. A better measure of snow precipitation is a marked-up
course comprising both open and sheltered areas that is measured
by hand (like Spencers Creek) or to find a spot out of the wind
where the snow has a better chance to land in the guage. None
of the obs spots in the Snowy Mountains (except perhaps
Cabrumurra that I havn't seen) are in particularly sheltered
areas. Thredbo AWS is perhaps the worst offender in this
regard perched near the top of the escarpment. Perisher's
is OK but the temperature recorded there would sometimes be
affected by the near passing of snow cats and waste heat
from the Perisher Centre in particular conditions. Bugger-all
snow accumulates in most snow guages during strong SW/W/NW
winds. Drop the wind speed to below say, 20kph and the snow
guage starts working properly.
,-_|\ Michael Scollay mailto:michael.scollay at telstra.com.au
/ \ Telstra Technology 7/255 Elizabeth St. Sydney NSW 2000
\_,^._* Strategy & Research snail: Locked Bag 6764 GPO Sydney 1100
v Sydney NSW Australia +61 2 9298 5891P +61 2 9298 5820F
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005
Date: Wed, 21 Jul 1999 10:51:48 +1000
From: Chas & Helen Osborn [hosborn at tassie.net.au]
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Subject: aus-wx: Strahan Wx
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Hello Everyone
Rain overnight 6mm . We now have frequent showers, some with soft hail.
We have a Gale warning current and snow is expected down to 600m by
tonight.
Temp now 9C.
Out at the airport at 1030am WNW at 32 knots QNH 1000
OBSERVATIONS: 0900 hours on Wednesday, 21/07/1999
CAPE SORELL WIND WNW 20KT
RAIN
** WAVERIDER SIGNIFICANT WAVE HEIGHT 4.3m
MAXIMUM HEIGHT OVER THE PAST 3 HRS 7.9m
AVERAGE PERIOD 11s
LOW ROCKY POINT WIND NW 25KT
This site is about halfway down the coast between Strahan and Maatsuyker
Is
MAATSUYKER IS WIND NNW 37KT
SEA ROUGH HEIGHT 2.5-4M
SWELL SW HEAVY HEIGHT OVER 5M
VISIBILITY 10km SHOWERS
Chas
Strahan Tasmania
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006
From: "Nick Sykes" [nsykes at labyrinth.net.au]
To: [aussie-weather at world.std.com]
Subject: aus-wx: Squalls to 60knots!!!!
Date: Wed, 21 Jul 1999 14:07:46 +1000
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Hi all
Looks like it's going to be a rough 24hr period in the SE with a vigorous
front moving up from the SW, from a deepening low to the S of Tassie.
Numerous wind warnings have been issued for Victorian and Tasmanian coastal
Waters.
Currently in Melbourne the wind has really started to freshen, from the NW,
squalls are expected with and behind the front.
BUREAU OF METEOROLOGY
VICTORIAN REGIONAL OFFICE
Forecast for Bass Strait and Victorian Coastal Waters
issued at 1210 hours on Wednesday the 21st of July 1999 valid until midnight
Thursday
Synoptic Summary
Another cold front and low pressure system, embedded in a vigorous west to
southwesterly airstream will cross Tasmania late today and tonight.
Warnings
A Gale warning is current for all Victorian waters and for northern
Tasmanian
waters.
Forecast
WESTERN BASS STRAIT:
Westerly wind increasing to 25/35knots this afternoon with squalls to
45knots
then tending more southwesterly tonight at similar strength. Southwesterlies
tomorrow easing to 15/25knots by the afternoon, with further easing likely
at
night. Seas 4 to 5 metres abating to 2 to 3 metres tomorrow afternoon.
West/southwesterly swell 4 to 6 metres. Showers reducing visibility to 3nm.
NORTHERN BASS STRAIT:
West/northwesterly wind 25/35knots, reaching 40knots in the south, tending
west/southwesterly overnight at 30/40knots with squalls reaching 50knots.
Southwest wind tomorrow easing to 20/30knots by the afternoon and 15/25knots
by
evening. Seas 3 to 5 metres, reaching 6 metres overnight then abating
gradually
to 2 to 4 metres tomorrow. West/southwesterly swell 3 to 4 metres. Showers
reducing visibility to 2nm.
EASTERN BASS STRAIT:
West/northwesterly wind 25/35knots, increasing to 35/45knots late today and
overnight with squalls reaching 60knots and tending west/southwesterly.
West/southwest wind easing to 20/30knots Thursday afternoon. Seas 3 to 4
metres increasing 4 to 6 metres offshore tonight and locally reaching 7
metres
in the far east, then abating 3 to 4 metres later tomorrow. Southwesterly
swell
rising 2 to 3 metres.
SOUTHERN BASS STRAIT:
Westerly winds 25/35knots reaching 40 knots at times in the west, ahead of a
southwesterly change of 30/40knots late today, locally stronger at times in
the
west. Southwest winds gradually moderating to become 15/25knots later
tomorrow.
Seas 4 to 5 metres reaching 6 metres in the west. Northwest swell to 3
metres.
Outlook for Bass Strait for Friday
West/southwesterly wind, fresh to strong at first in the east but easing to
be
generally moderate.
Squalls to 60knots forecast for Eastern Bass Srait!!!!
Nick Sykes
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007
Date: Wed, 21 Jul 1999 14:15:40 +1000
From: Chas & Helen Osborn [hosborn at tassie.net.au]
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Subject: aus-wx: Strahan Wx
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Hello Everyone
Just in from the airport 2pm WSW 33G53KT QNH0997 Temp 9C.
Chas
Strahan Tasmania
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008
From: Paul_Mossman at agd.nsw.gov.au
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Date: Wed, 21 Jul 1999 14:41:17 +1000
Subject: Re: aus-wx: Strahan Wx
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Thats damn windy there Chas!
Breezy here but not to bad with lovely blue sky.
Paul at Port Macquarie
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009
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Charlotte Pass 3pm Obs of 20/7/1999 suspect...
To: aussie-weather at world.std.com
Date: Wed, 21 Jul 1999 17:30:18 +1000 (EST)
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>
> On Tue, 20 Jul 1999 19:11:23 +1000, Keith Barnett
> wrote:
>
> >I wonder if the observer simply omitted a minus sign in front of the 4?
> >
> Quite likely. The reported max was +4, and the reported 3pm dry bulb
> and dew points +4.1 and +2.1 respectively. Minuses all round would
> seem more likely. Of interest, too, is that the observer reported (a)
> present weather fine, (b) past weather fine with variable cloud, and
> (c) zero rainfall. Perisher reported 10mm precip 9 to 3, with cont mod
> snow at 3pm and past snow. Crackenback auto reported 0.8mm 9 to 3 with
> a 30 knot WNW wind. Also of interest is that the Perisher observer
> reported continuous moderate snow but a visibility of 20km.
Actually, minus signs all round would be impossible - this would leave
the dew point higher than the dry bulb.
I'm suspicious that a previous day's obs may have been transmitted by
mistake.
Having said that, under the right conditions Charlottes Pass (a
relatively sheltered valley site) CAN have significantly warmer max
temps than the much more exposed sites at Cabramurra and Crackenback
- but (a) those right conditions involve relatively calm winds, which
certainly wasn't the case yesterday and (b) Perisher is similarly
situated, so if there were a genuine difference one would expect
Perisher to be around 2, at least.
(Something else that could make a difference - although, again, more
under calm conditions - would be if the Charlottes Pass screen is
over bare ground for whatever reason, and the other screens are over
snow. I have no idea whether this is the case or not).
> Methinks that obs from the ski resorts may sometimes play second
> fiddle to many other activities.
I agree entirely. The quality of obs from the alpine areas is, frankly,
an embarrassment - only Cabramurra comes close to being a long-term
record of reasonable quality (and it's significant that this is run
by the hydro people, not the ski resorts). This will improve as the
automatic stations acquire a reasonable length of record - but this
will take a fair bit of time. (It will also require the stations to
be well-maintained).
I'm about to post elsewhere in this thread regarding snowfall
measurements.
Blair Trewin
>
> --
> Laurier Williams
> Australian Weather Links and News
> http://www.ozemail.com.au/~wbc/
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>
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010
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Charlotte Pass 3pm Obs of 20/7/1999 suspect...
To: aussie-weather at world.std.com
Date: Wed, 21 Jul 1999 17:34:26 +1000 (EST)
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Michael Scollay wrote:
> That conclusion confirms that the snow must have been good
> I can confirm the 10mm Perisher recorded from our ski lodge
> obs that also reported an increased snow-depth on the verandah
> from the early birds who cleared some 20cm off from Monday night
> to 8:30am. They had to clear another 15-20cm off at 17:00. Given
> that the verandah in question is somewhat sheltered, 10mm (say
> 10cm of snow 9-3) is a reasonable measure.
>
> Problem with snow/rain guages in these conditions are caused by
> snow blowing almost horizontal at 30kph. Most seems to eddy
> around the guage with the odd flake landing on the heated
> surface. A better measure of snow precipitation is a marked-up
> course comprising both open and sheltered areas that is measured
> by hand (like Spencers Creek) or to find a spot out of the wind
> where the snow has a better chance to land in the guage. None
> of the obs spots in the Snowy Mountains (except perhaps
> Cabrumurra that I havn't seen) are in particularly sheltered
> areas. Thredbo AWS is perhaps the worst offender in this
> regard perched near the top of the escarpment. Perisher's
> is OK but the temperature recorded there would sometimes be
> affected by the near passing of snow cats and waste heat
> from the Perisher Centre in particular conditions. Bugger-all
> snow accumulates in most snow guages during strong SW/W/NW
> winds. Drop the wind speed to below say, 20kph and the snow
> guage starts working properly.
Cabramurra is a very exposed site as well.
Snow measurement is a MAJOR problem everywhere where there is
significant snowfall, not least because separating falling and
blowing snow becomes very difficult in some situations. There's
quite a bit in the scientific literature regarding the impact of
changes in snow gauges on the precipitation record, especially in
Russia (I can dig out references if anyone is interested). I'm
also aware of an experiment in Finland where a large number (20-30?)
of different types of snow gauges were set up in a single level
field and the differences in snow catch between some gauges were
upwards of 50%.
Blair Trewin
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011
Date: Wed, 21 Jul 1999 20:38:53 +1000
From: Don White [donwhite at ozemail.com.au]
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To: aussie-weather at world.std.com
Subject: Re: aus-wx: Charlotte Pass 3pm Obs of 20/7/1999 suspect...
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
The other interesting thing to note about this observation in question
in the wind - 130/30 when others in the area were 230 or 300. Also, the
direction of movement of the low cloud was given as from Se at 1500 ft -
all seems to much to be put down to observor error - but there appears
to be no other valid reason
Don White
Blair Trewin wrote:
>
> >
> > On Tue, 20 Jul 1999 19:11:23 +1000, Keith Barnett
> > wrote:
> >
> > >I wonder if the observer simply omitted a minus sign in front of the 4?
> > >
> > Quite likely. The reported max was +4, and the reported 3pm dry bulb
> > and dew points +4.1 and +2.1 respectively. Minuses all round would
> > seem more likely. Of interest, too, is that the observer reported (a)
> > present weather fine, (b) past weather fine with variable cloud, and
> > (c) zero rainfall. Perisher reported 10mm precip 9 to 3, with cont mod
> > snow at 3pm and past snow. Crackenback auto reported 0.8mm 9 to 3 with
> > a 30 knot WNW wind. Also of interest is that the Perisher observer
> > reported continuous moderate snow but a visibility of 20km.
>
> Actually, minus signs all round would be impossible - this would leave
> the dew point higher than the dry bulb.
>
> I'm suspicious that a previous day's obs may have been transmitted by
> mistake.
>
> Having said that, under the right conditions Charlottes Pass (a
> relatively sheltered valley site) CAN have significantly warmer max
> temps than the much more exposed sites at Cabramurra and Crackenback
> - but (a) those right conditions involve relatively calm winds, which
> certainly wasn't the case yesterday and (b) Perisher is similarly
> situated, so if there were a genuine difference one would expect
> Perisher to be around 2, at least.
>
> (Something else that could make a difference - although, again, more
> under calm conditions - would be if the Charlottes Pass screen is
> over bare ground for whatever reason, and the other screens are over
> snow. I have no idea whether this is the case or not).
>
> > Methinks that obs from the ski resorts may sometimes play second
> > fiddle to many other activities.
>
> I agree entirely. The quality of obs from the alpine areas is, frankly,
> an embarrassment - only Cabramurra comes close to being a long-term
> record of reasonable quality (and it's significant that this is run
> by the hydro people, not the ski resorts). This will improve as the
> automatic stations acquire a reasonable length of record - but this
> will take a fair bit of time. (It will also require the stations to
> be well-maintained).
>
> I'm about to post elsewhere in this thread regarding snowfall
> measurements.
>
> Blair Trewin
>
> >
> > --
> > Laurier Williams
> > Australian Weather Links and News
> > http://www.ozemail.com.au/~wbc/
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> > with "unsubscribe aussie-weather your_email_address" in the body of your
> > message.
> > -----------------------jacob at iinet.net.au------------------------------
> >
>
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012
X-Sender: mbath at pop.ozemail.com.au
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Date: Wed, 21 Jul 1999 20:55:45 +1000
To: aussie-weather at world.std.com
From: Michael Bath [mbath at ozemail.com.au]
Subject: aus-wx: Fwd: cyclone history
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Does anyone have info on this event. If so please repsond to the list and
to Bronwyn at the address below.
cheers, Michael
>From: Bronwyn.Jones at DWNPLAZA.NCOM.nt.gov.au
>Date: Wed, 21 Jul 1999 12:30:04 +0930
>Subject: cyclone history
>To: " - (052)mbath(a)ozemail.com.au"
>
>Michael,
>
>I'm researching a "storm" that affected a sailing ship that arrived in
>Rockhampton on March 6th, 1874 (having left London Nov. 1873). Apparently it
>was pretty bad to the extent the ship sustained quite a lot of damage.
>I've been up to the "Tropical Cyclones in Australia" internet site to see what
>historical data the site held - unfortunately the data is only as far back as
>1907. This site provided your address if we had any questions.
>Do you know if cyclone activity was recorded pre 1907 and if it was where
could
>I access this data?
>
>Thank-you for your time,
>Bronwyn
>
>Darwin NT
>
>
============================================================
Michael Bath Wollongbar, N.Rivers NSW mbath at ozemail.com.au
http://australiansevereweather.simplenet.com/
http://www.lightningphotography.com/
http://www.severeweather.asn.au/
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-----------------------jacob at iinet.net.au------------------------------
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013
From: John Woodbridge [jrw at pixelcom.net]
To: "'aussie-weather at world.std.com'" [aussie-weather at world.std.com]
Subject: aus-wx: RE: aus-wx July rainfall
Date: Wed, 21 Jul 1999 22:40:19 +1000
Organization: Pixel Components Pty Ltd
X-Mailer: Microsoft Internet E-mail/MAPI - 8.0.0.4211
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Hi Anthony,
Responding to this, 54mm so far this July at Mt. Crosby, of which a large
percentage was recorded on the first day or the month (32mm). Good rain
for this time of year!!
Winter is back... Ipswich (read Amberley) was reported as min 1C last
night, I recorded 6.5C. Tonight will be a bit cooler with 0C forecast.
John.
>snip
Subject: aus-wx: Weak line of Showers + T'storms yesterday evening
Did anyone receive anything nice? So far, I've had 97.4mm for July -
well above the July average of 62mm, but nowhere as much as our NE NSW
counterparts.
Anthony from Brisbane
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-----------------------jacob at iinet.net.au------------------------------
| Document: 990721.htm
Updated: 24 July 1999 |
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