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Storm News
[Index][Aussie-Wx] |
Australian Weather Mailing List Archives: Thursday, 30 March 2000 |
From Subject
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001 "John Woodbridge" [jrw at pixelcom.net] Fort Worth Tornado
002 "John Woodbridge" [jrw at pixelcom.net] BSCH Picture Update
003 Matt Smith [disarm at braenet.com.au] BSCH Picture Update
004 Anthony Cornelius [cyclone at flatrate.net.au] Fort Worth
005 "Jane ONeill" [cadence at rubix.net.au] SAD - today's medical thought
006 Blair Trewin [blair at met.Unimelb.EDU.AU] Fort Worth
007 "W.A. (Bill) Webb" [billwebb at tpgi.com.au] Climate site
008 winnie w tong [wtong02 at ccsf.cc.ca.us] USA-weather/aussie-weather
009 Miguel de Salas [mm_de at postoffice.utas.edu.au Slow Satpics
010 Lindsay [writer at lisp.com.au] Obs at Katoomba and Mt Boyce
011 Michael Scollay [michael.scollay at telstra.com. Slow Satpics
012 Lindsay [writer at lisp.com.au] Very high mean minima this March
013 Ben Quinn [bodie at flatrate.net.au] [Fwd: Extreme Weather Video?]
014 Blair Trewin [blair at met.Unimelb.EDU.AU] Lack of cold days in Melbourne
015 Blair Trewin [blair at met.Unimelb.EDU.AU] Very high mean minima this March
016 Blair Trewin [blair at met.Unimelb.EDU.AU] Obs at Katoomba and Mt Boyce
017 Michael Scollay [michael.scollay at telstra.com. Please Note my New Contact Details...
018 Ira Fehlberg [jra at upnaway.com] BSCH Picture Update wall clouds
019 "Leslie R. Lemon" [lrlemon at compuserve.com] BSCH Picture Update wall clouds
--------------------------------------------------------------------------------------
001
From: "John Woodbridge" [jrw at pixelcom.net]
To: [aussie-weather at world.std.com]
Subject: RE: aus-wx: Fort Worth Tornado
Date: Thu, 30 Mar 2000 00:14:04 +1000
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Awesome footage on the late night news. I was particularly impressed with
the shot of trashed hi rise buildings being illuminated by what must have
been a phenomenal lightning show.
Here at Mt. Crosby, no tornadoes, but at midnight the temp is 24C and 68% RH
making it the warmest night since Feb 12th.
John.
>snip
For information regarding today's Fort Worth tornado go to
http://www.storm-track.com/
We'll have some images up on MSC shortly of the event.
Jane ONeill
ASWA - Victoria
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002
From: "John Woodbridge" [jrw at pixelcom.net]
To: [aussie-weather at world.std.com]
Subject: RE: aus-wx: BSCH Picture Update
Date: Thu, 30 Mar 2000 00:19:32 +1000
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Hi Anthony,
mmm yes, Maybe too small for a Meso I think, but that is just my opinion.
Regards
>snip
Also, is what I believe to be a possible mesocyclone - this is captured
from video footage, the URL is:
http://bsch.simplenet.com/anthony/capture/Jan5/KS040.JPG
Although some people certainly have differing opinions on this
particular capture!
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003
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Date: Thu, 30 Mar 2000 07:47:18 +1000
To: aussie-weather at world.std.com
From: Matt Smith [disarm at braenet.com.au]
Subject: Re: aus-wx: BSCH Picture Update
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1st one id say 100% wall cloud.
2nd one hmm was it rotating ? If it was i would say yes, maybe.
Matt
>
>
>> http://www.bsch.simplenet.com/pictures/damien/05-01-2000a.htm
>
>I believe this is certainly a Wall Cloud, and a rather nice one (IMO).
>
>Also, is what I believe to be a possible mesocyclone - this is captured
>from video footage, the URL is:
>http://bsch.simplenet.com/anthony/capture/Jan5/KS040.JPG
>
>Although some people certainly have differing opinions on this
>particular capture!
>--
>Anthony Cornelius
>Queensland Coordinator of the Australian Severe Weather Association
>(ASWA)
>(07) 3390 4812
>14 Kinsella St
>Belmont, Brisbane
>QLD, 4153
>Please report severe thunderstorms on our Queensland severe thunderstorm
>reporting line on (07) 3390 4218 or by going to our homepage at
>http://www.severeweather.asn.au
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> -----------------------jacob at iinet.net.au------------------------------
>
>
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004
Date: Thu, 30 Mar 2000 09:06:11 +1000
From: Anthony Cornelius [cyclone at flatrate.net.au]
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To: aussie-weather at world.std.com
Subject: Brisbane's One Month of Late Summer? (Was --> Re: aus-wx: Fort Worth
Tornado)
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Hi John and all,
John Woodbridge wrote:
> Here at Mt. Crosby, no tornadoes, but at midnight the temp is 24C and 68% RH
> making it the warmest night since Feb 12th.
Is it just me, or has March appeared to be the warmest month since 98/99
summer? Temperatures appear to have consistantly been around the 28C
mark, and nights have been warmer, around 18-21C. Dec and Jan were
certainly much cooler (except for our 5 days of summer during the
heatwave in Jan), with most of the days around 26C, and nights appeared
to be around 16-18C. February was similar, but I think the daytime
temps were marginally warmer, and night-time temps were also slightly
warmer, especially towards the end of the month.
Any thoughts/opinions? Blair, do you have any averages?
Currently 9am here, 28.4C here (27C at the AP), DP of 20C, and the
pressure is 1019hPa rising. Yesterday coastal DP's were much more
summer like, sitting around 22C. It was 57.4C in my car after sitting
in the Sun for a few hours at work :-)
--
Anthony Cornelius
Queensland Coordinator of the Australian Severe Weather Association
(ASWA)
(07) 3390 4812
14 Kinsella St
Belmont, Brisbane
QLD, 4153
Please report severe thunderstorms on our Queensland severe thunderstorm
reporting line on (07) 3390 4218 or by going to our homepage at
http://www.severeweather.asn.au
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005
From: "Jane ONeill" [cadence at rubix.net.au]
To: "Aussie Weather" [aussie-weather at world.std.com]
Subject: aus-wx: SAD - today's medical thought
Date: Thu, 30 Mar 2000 09:27:39 +1000
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Ive borrowed this article and modified it for the southern hemisphere -
could be enough to help us all get through the coming Stratocu chase days
that are lurking just around the corner.
(thanks to Weather.com for the original article
http://www.weather.com/health/laurus/solutions.html )
Maybe we need to come up with some suggestions of our own......
Jane ONeill
ASWA - Victoria
-----------------------------------------------------------
Solutions
Minimize its symptoms - try these tips.
If you have mild SAD symptoms:
Let in light. Try letting more light into your home by keeping the curtains
and blinds open, by sitting near windows and looking outside frequently
(what us??? why on earth would we want to look outside at the sky???), by
turning on lights on cloudy days, and by going out to socialize as often as
you can (.....no that doesn't mean spending the entire winter off your
face!!!).
Take a walk on sunny winter days....and cloudy winter days, and through
sleet, hail & snow...guaranteed to make SDS withdraw for a short period
while you recover from pneumonia!!. Increase your exposure to sunlight, take
a walk at midday when the sun is usually brightest.
Go north. Make a yearly winter vacation to the Caribbean or another warm
place (I like this suggestion!!! Caribbean will do me nicely - Darwin in the
dry definitely won't though - I'll stick with Sc rather than Darwin in July
thank you).
If you have moderate to severe SAD symptoms:
Practice phototherapy. Set up a light box at home to supplement the season's
short supply of sunlight. Purchase the type that's portable and is the size
of a suitcase. Within a week or two of sitting under or near the light box
for at least 30 minutes a day, most sufferers see a marked improvement in
their symptoms........alternatively, you could inhabit a place like the one
I found last weekend while exploring our sunny bayside suburb of St
Kilda..." St Kilda Laundrette and Solariium"
Eat the right foods. Nutritionists suggest eating foods that can help your
body cope with winter's lack of sunlight. Winter is not the time to cut back
on complex and fibre containing carbohydrates, such as fruits, vegetables,
beans, nuts, and seeds. Steer clear of sweets, they can adversely affect
blood sugar levels. (oh well, that's blown the normal stormchasers' diet of
McDonalds & chocolate totally out the window!!)
You may also want to take some supplements. Supplements that may help
include calcium/magnesium and B vitamins. (no, not alcohol)
If you have severe SAD symptoms:
See your doctor(or move to the USA during our winter).
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006
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: Brisbane's One Month of Late Summer? (Was --> Re: aus-wx: Fort Worth
To: aussie-weather at world.std.com
Date: Thu, 30 Mar 2000 10:02:41 +1000 (EST)
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> Is it just me, or has March appeared to be the warmest month since 98/99
> summer? Temperatures appear to have consistantly been around the 28C
> mark, and nights have been warmer, around 18-21C. Dec and Jan were
> certainly much cooler (except for our 5 days of summer during the
> heatwave in Jan), with most of the days around 26C, and nights appeared
> to be around 16-18C. February was similar, but I think the daytime
> temps were marginally warmer, and night-time temps were also slightly
> warmer, especially towards the end of the month.
>
> Any thoughts/opinions? Blair, do you have any averages?
>
The relevant means are:
January 2000 max 28.2 min 19.6 (both dragged up by the mid-month
heatwave)
February 2000 max 27.7 min 20.0
March 2000 max 27.8 min 19.8 (to date)
(all figures are provisional, as I'm only going off rounded daily
temps).
The March values are still only average (max temp anomaly -0.3, min
temp anomaly +0.3). The anomalies for January and February were
-1.0/-1.4 and -1.2/-0.8 respectively.
Blair Trewin
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007
From: "W.A. (Bill) Webb" [billwebb at tpgi.com.au]
To: "Wx Aus" [aussie-weather at world.std.com]
Subject: aus-wx: Climate site
Date: Thu, 30 Mar 2000 09:49:44 +1000
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Hi List,
For those interested in climate, have a gander at
http://topex-www.jpl.nasa.gov/
Apologies to those who know of it already
Bill
Proserpine
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008
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Date: Wed, 29 Mar 2000 16:52:00 -0800 (PST)
From: winnie w tong [wtong02 at ccsf.cc.ca.us]
To: aussie-weather at world.std.com
cc: wtong02 at ccsf.cc.ca.us
Subject: aus-wx: USA-weather/aussie-weather
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Hi anybody,
I have been lived in California almost 20 years. It is one of the states
of Unites States. I know that in summer is not too hot and in winner is not
too cold. It is very nice weather all year, but it has a problem that there
is a earthquake happened in the Bayarea, San Francisco and other cities
around the westcoast.
I think that there are a lot of people living in Australia. I have never
been there for traveling. I think that there are very nice places and nice
weather to live.
Can you tell me about the country?
Thank You!
\ ) ( /
\ ) ( /
\ ) ( /
'"'"'
( )
( 0 0 )
( () )
-_--_-
----**88**-------------------- -- ----------------8888******
" My Lovely Pet "
Winnie Tong
Free-lance Photographer
(510)587-3361
wtong02 at ccsf.cc.ca.us
---------------------- O:-)
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009
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Date: Thu, 30 Mar 2000 11:29:57 +1000
To: aussie-weather at world.std.com
From: Miguel de Salas [mm_de at postoffice.utas.edu.au]
Subject: aus-wx: Slow Satpics
Sender: aussie-weather-approval at world.std.com
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I don't know if this problem has affected anybody else:
I usually download the GMS-5 images kept at
http://www.npmoc.navy.mil/satimages/
As I have a fast connection, they usually download in a few seconds.
However, in the last week or so, they've been excruciatingly slow.
Anyone else had this problem?
Miguel de Salas
School of Plant Science,
University of Tasmania,
PO Box 252-55, Sandy Bay, Hobart
Tasmania, Australia, 7001.
mailto://mm_de at postoffice.utas.edu.au
My Moths Page:
http://members.xoom.com/migueldes/moths/moths.html
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010
Date: Wed, 29 Mar 2000 04:45:38 -0800
From: Lindsay [writer at lisp.com.au]
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To: aussie-weather at world.std.com
Subject: aus-wx: Obs at Katoomba and Mt Boyce
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For Laurier, Blair, Don, Mark and others interested,
The maximum temps given for Mount Boyce AWS and Katoomba Composite on
Monday 27th of March were 21.3 and 19.5 respectively. Interesting to see
Katoomba so much cooler than Mt Boyce.
I had 18.5 at my place although my readings (strictly amateur, of
course) are only to the nearest half degree. It was actually around 18.7
at my place, I think, on that day.
Any thoughts?
Lindsay P.
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011
Date: Thu, 30 Mar 2000 11:55:17 +1000
From: Michael Scollay [michael.scollay at telstra.com.au]
Organization: Telstra Strategy & Research
X-Mailer: Mozilla 4.7 [en] (X11; U; SunOS 5.5.1 sun4m)
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To: aussie-weather at world.std.com
Subject: Re: aus-wx: Slow Satpics
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Miguel de Salas wrote:
>
> I don't know if this problem has affected anybody else:
>
> I usually download the GMS-5 images kept at
> http://www.npmoc.navy.mil/satimages/
>
> As I have a fast connection, they usually download in a few seconds.
> However, in the last week or so, they've been excruciatingly slow.
>
> Anyone else had this problem?
Archive logs show the usual NPMOC congestion times and rate
downloads from 1KB/s to 70.4KB/s. Last night was slow time
but there is no record of lost images in the archive due to
congestion reasons. I'm in Sydney on a very fast link that
gets up to 240KB/s ftp downloads/uploads to simplenet, so
I'd say that your congestion problem is a combination of
local and remote NPMOC server reasons. Without seeing a log
of http stderr codes (usually suppressed in the browser but
logged from the archive scripts), it's impossible to tell
for sure, but in my experience, the usual 'net congestion
reasons are probably to blame in your case.
Michael Scollay mailto:mscollay at telstra.com
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012
Date: Wed, 29 Mar 2000 03:57:33 -0800
From: Lindsay [writer at lisp.com.au]
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To: aussie-weather at world.std.com
Subject: Re: aus-wx: Very high mean minima this March
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Blair,
How's the mean minima records going for Canberra, Sydney, Melbourne etc
for March? Especially Canberra.
Lindsay P.
Blair Trewin wrote:
>
> Melbourne, Canberra and Sydney are all currently running above
> their previous records for highest March mean minima:
>
> Melbourne 16.9 (previously 16.8, 1974)
> Canberra 15.3 (previously 13.6, 1983)
> Sydney 19.6 (previously 19.3, 1956/68/83)
>
> With the climatological cooling later in the month I'd be surprised
> if Melbourne and Sydney broke their records, but Canberra should (an
> average of 10.5 for the rest of the month would be enough). The
> Canberra value is particularly impressive because there is no
> significant urbanisation signal there (the airport is well outside
> the city boundaries).
>
> Blair Trewin
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> -----------------------jacob at iinet.net.au------------------------------
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013
Date: Thu, 30 Mar 2000 11:55:54 +1000
From: Ben Quinn [bodie at flatrate.net.au]
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To: aussie-weather at world.std.com
Subject: aus-wx: [Fwd: Extreme Weather Video?]
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Hi Everyone,
I thought some people may be interested in this:
--
Ben Quinn
The Brisbane Storm Chasers Homepage (BSCH)
http://www.bsch.simplenet.com
The Australian Weather Pages Webring
http://www.bsch.simplenet.com/webring/index.htm
NEMAS (North East Media of Atmospheric Science) Weather Education Pages
http://www.nemas.net/edu/index.htmReceived: by warpcore (mbox bodie)
(with Cubic Circle's cucipop (v1.31 1998/05/13) Thu Mar 30 07:47:53 2000)
X-From_: jpevar at realtv1.com Thu Mar 30 05:25:32 2000
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Date: Wed, 29 Mar 2000 11:24:03 -0800
Subject: Extreme Weather Video?
From: "Jeremy Pevar" [jpevar at realtv1.com]
To: bodie at flatrate.net.au
Mime-version: 1.0
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Ben,
Hi. My name is Jeremy Pevar, I'm a researcher with the syndicated
television program RealTV. I just came across your web site and
was wondering if you had any cool extreme weather video footage?
RealTV pays competitive licensing fees for all footage used on
the show and will cover all dubbing and shipping costs. If you
have footage that you think may be good for RealTV, please let me
know.
Thanks...Jeremy Pevar
------------------------------------------------------------------
Jeremy Pevar | RealTV
jpevar at realtv1.com | www.realtv1.com
tel: (323)860-5173 | tel: (323)860-0100
fax: (323)860-0101 | (888)732-5882
------------------------------------------------------------------
014
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: aus-wx: Lack of cold days in Melbourne
To: aussie-weather at world.std.com (Aussie Weather)
Date: Thu, 30 Mar 2000 12:25:42 +1000 (EST)
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For those in Melbourne who have been wondering where all the cool days
have gone, it may be of interest to know that there has not been a
day with a maximum temperature in the bottom 5% of records for the
particular time of year since May 15 last year. As such an event
would be statistically expected once every 20 days, this is a fairly
significant streak.
Said streak may well come to an end shortly, as some of the models,
especially the ECMWF, are looking promising for a significant cold
outbreak on Tuesday (subject to all the usual caveats). The threshold
for the 5% level in early April is around 16.
There has been only one day under 20 in Melbourne in March - not a
record (1956 and 1971 - both, interestingly, La Nina years - reached
20 on every day) but close.
Blair Trewin
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015
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Very high mean minima this March
To: aussie-weather at world.std.com
Date: Thu, 30 Mar 2000 13:44:40 +1000 (EST)
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>
> Blair,
>
> How's the mean minima records going for Canberra, Sydney, Melbourne etc
> for March? Especially Canberra.
>
>
> Lindsay P.
>
>
> Blair Trewin wrote:
> >
> > Melbourne, Canberra and Sydney are all currently running above
> > their previous records for highest March mean minima:
> >
> > Melbourne 16.9 (previously 16.8, 1974)
> > Canberra 15.3 (previously 13.6, 1983)
> > Sydney 19.6 (previously 19.3, 1956/68/83)
> >
Updates as of this morning, with 1 day remaining:
Melbourne 15.8
Canberra 13.7
Sydney 19.0
Canberra needs around 10 to equal the record, 13 to break it. Current
forecast for tonight is 9, so they may not quite make it.
One record that will certainly go comes from WA, which has had another
very cool month. Kalgoorlie's mean max for the month so far is 24.0,
5.7 below average and 2.4 below the existing record of 26.4, set in
1975 and 1984 - quite an impressive margin given the 103-year length
of record! (the first 50 are from the post office, but the small
difference between the post office and airport during the 11 years
of overlap suggests that nothing pre-1942 was below the 1984 mark).
(For this record to remain intact, it would have to average 60 over
the last two days of the month!),
Blair Trewin
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016
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Obs at Katoomba and Mt Boyce
To: aussie-weather at world.std.com
Date: Thu, 30 Mar 2000 13:47:53 +1000 (EST)
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>
> For Laurier, Blair, Don, Mark and others interested,
>
> The maximum temps given for Mount Boyce AWS and Katoomba Composite on
> Monday 27th of March were 21.3 and 19.5 respectively. Interesting to see
> Katoomba so much cooler than Mt Boyce.
>
1.8 degrees on a single day is well within the range of the difference
that could be reasonably expected. In homogeneous terrain with a
dense station network the 99th percentile of the temperature difference
between a given site and its nearest neighbour is typically 2.5-3
degrees; more in complex topography or data-sparse areas.
(For this reason, 4 degrees is about the smallest error reasonably
detectable by spatial analysis).
Blair Trewin
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017
Date: Thu, 30 Mar 2000 17:25:22 +1000
From: Michael Scollay [michael.scollay at telstra.com.au]
Organization: Telstra Strategy & Research
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To: Aussie Weather [aussie-weather at world.std.com]
Subject: aus-wx: Please Note my New Contact Details...
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Hi Aussie-Weather people,
As "michael.scollay at telstra.com.au", I will be unsubscribing from
Aussie-Weather from late tomorrow until some time in May. This is
because I am leaving my current employer, Telstra.
The ASWA Archive will also stop tomorrow but I will be able to
field both outstanding and new requests up until tomorrows date
late in May. All records have been kept...let's hope that the
backup tapes work:-)
If you wish to contact me by E-Mail, please place the following
address in your address book mailto:mscollay at telstra.com
I will relish any of those really good posts being sent directly
to this address.
I will only log into "telstra.com" in an ad-hoc manner so please
don't rely on E-Mail to contact me. Both my home number and my
mobile number is listed in the Electronic White Pages found at
http://www.whitepages.com.au/wp/search.jhtml - Just plug in my
name etc. with the suburb "Lindfield", "capital city", NSW.
Finally, for ASWA members, Issue 17 of Storm News is being
"published" right now and will be mailed-out early next week.
I will be producing the mailing list tomorrow, so if there is
a problem with your physical mail address in the ASWA records,
let me know ASAP and I'll fix it before producing address labels.
Michael Scollay mailto:mscollay at telstra.com
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018
X-Sender: jra at upnaway.com
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Date: Thu, 30 Mar 2000 17:41:42 +0800
To: aussie-weather at world.std.com
From: Ira Fehlberg [jra at upnaway.com]
Subject: aus-wx: BSCH Picture Update wall clouds
Sender: aussie-weather-approval at world.std.com
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The best way of identifying wall clouds is to look at where abouts the
feature is in regards to the rest of the storm. The wall cloud is always
under the main updraught but in front of the RFD. Obvioulsy Damien would be
able to tell us this.
eg's
http://members.xoom.com/wastorms/170498-16.html
http://www.braenet.com.au/~disarm/thunderstruck/pictures/jan30-5.htm
http://www.braenet.com.au/~disarm/thunderstruck/pictures/nov3.htm
in all these pis you can see the RFD in the background. A HP supercell
model is at
www.inflowimages.com/hpsc.jpg
Ira Fehlberg
At 07:47 30/03/00 +1000, you wrote:
>
>1st one id say 100% wall cloud.
>
>2nd one hmm was it rotating ? If it was i would say yes, maybe.
>
>Matt
>
>>
>>
>>> http://www.bsch.simplenet.com/pictures/damien/05-01-2000a.htm
>>
>>I believe this is certainly a Wall Cloud, and a rather nice one (IMO).
>>
>>Also, is what I believe to be a possible mesocyclone - this is captured
>>from video footage, the URL is:
>>http://bsch.simplenet.com/anthony/capture/Jan5/KS040.JPG
>>
>>Although some people certainly have differing opinions on this
>>particular capture!
>>--
>>Anthony Cornelius
>>Queensland Coordinator of the Australian Severe Weather Association
>>(ASWA)
>>(07) 3390 4812
>>14 Kinsella St
>>Belmont, Brisbane
>>QLD, 4153
>>Please report severe thunderstorms on our Queensland severe thunderstorm
>>reporting line on (07) 3390 4218 or by going to our homepage at
>>http://www.severeweather.asn.au
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>> message.
>> -----------------------jacob at iinet.net.au------------------------------
>>
>>
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> -----------------------jacob at iinet.net.au------------------------------
>
>
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019
Date: Thu, 30 Mar 2000 08:49:21 -0500
From: "Leslie R. Lemon" [lrlemon at compuserve.com]
Subject: aus-wx: BSCH Picture Update wall clouds
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Ira Fehlberg wrote:
> The best way of identifying wall clouds is to look at where abouts the
> feature is in regards to the rest of the storm. The wall cloud is always
> under the main updraught but in front of the RFD. Obviously Damien would
be
> able to tell us this.
>
> eg's
> http://members.xoom.com/wastorms/170498-16.html
> http://www.braenet.com.au/~disarm/thunderstruck/pictures/jan30-5.htm
> http://www.braenet.com.au/~disarm/thunderstruck/pictures/nov3.htm
> in all these pis you can see the RFD in the background. A HP supercell
> model is at
> www.inflowimages.com/hpsc.jpg
You are quit right in pointing out the relationship of the wall cloud to
the main cumulonimbus tower and overshooting dome. Often there is a slope
to these features from cloud base to overshooting dome. However, in each
of these excellent examples we can see a region of sunlight and lack of
precip to the rear. This can be but is not necessarily the RFD. Remember
that the Rear Flank Downdraft (RFD) is just that, a downdraft (downdraught,
[S]). Normally, and in the most obvious cases associated with the "Classic
Supercell", the RFD is an 'escarpment' or evaporation and dissipation of
low cloud in the cloud base to the rear or right (or north when in front of
the approaching storm in the southern hemisphere, left or south in the
northern hemisphere). As one watches, you can often see descending and
evaporating cloud tags on the edges of the escarpment and this region can
frequently be seen to elongate as a region of clearing that rotates from
the rear of the rain free cloud base and wall cloud around this updraft
base. In fact, the hook echo, when present, is often detected as the
descending precip within this elongated and wrapping escarpment.
With the HP supercell, the RFD is very frequently not so obvious because
the region of the RFD is typically filled with very heavy precip (rain and
hail) and thus one can not see and 'escarpment' of cloud base. Instead the
region of the RFD is identified by this region of heavy precip which wraps
from the rear around, and sometimes obscuring the wall cloud and rain free
cloud base from view.
In all of these cases I don't see the obvious escapement or elongated
wraping region around the updraft base. You may be correct, but I just
don't see the more obvious characteristics or signs of the downdraft.
However, your points were very well taken in noting the location of the
wall cloud relative to the rest of the storm. Yours was a very good post.
Les
************************
Leslie R. Lemon
Radar, Severe Storms, & Research Meteorologist
Tel. 816-373-3533, 816-213-3237
E-Mail: lrlemon at compuserve.com
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| Document: 000330.htm
Updated: 03 June 2000 |
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