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Storm News
[Index][Aussie-Wx] |
Australian Weather Mailing List Archives: Wednesday, 1 December 1999 |
From Subject
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001 "The Weather Co." [twc at theweather.com.au] Re: Borroloola Storms
002 Paul.Mossman at DWNNICH.OCA.nt.gov.au Re: Borroloola Storms
003 Lindsay [writer at lisp.com.au] Highest Public Pools in Australia?
004 Michael Scollay [michael.scollay at telstra.com. Highest Public Pools in Australia?
005 Patrick_Tobin at ama.com.au Chase update
006 Ben Quinn [bodie at flatrate.net.au] Chase Update
007 Paul.Mossman at DWNNICH.OCA.nt.gov.au Large storm building
008 Ben Quinn [bodie at flatrate.net.au] Chase Update
009 wbc at ozemail.com.au (Laurier Williams) November weather
010 "Ben Tichborne" [tich at netaccess.co.nz] More NZ storms and flooding
011 "Mark Hardy" [mhardy at magna.com.au] Automatic Radar Image Analysis - resend
012 Paul Mossman [paulmoss at tpgi.com.au] November weather
013 Michael Scollay [michael.scollay at telstra.com. Automatic Radar Image Analysis - resend]
014 Michael Scollay [michael.scollay at telstra.com. ASWA Archive Requests...Update
015 "Pearce" [r_pearce at Dingoblue.net.au] First chase a failure
016 Paul Mossman [paulmoss at tpgi.com.au] First chase a failure
017 Paul Graham [tornado at hobbiton.org] First chase a failure
--------------------------------------------------------------------------------------
001
From: "The Weather Co." [twc at theweather.com.au]
To: "Maillist Weather doods" [aussie-weather at world.std.com]
Subject: aus-wx: Re: Borroloola Storms
Date: Wed, 1 Dec 1999 08:43:44 +1100
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Howdy,
How about them Borroloolans:
186 mm yesterday (30/11/99) - record daily rainfall for Nov (Monthly avge
43mm)
122 mm in 92 min from 4:53 pm to 6:25 pm
37 mm in 10 min at 5 pm
and the proper wet season is still to come
Brett Dutschke
__________________
The Weather Company
Level 2, 7 West Street
North Sydney 2060
Phone: (02) 9955 7704
Fax: (02) 9955 1536
twc at theweather.com.au
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002
From: Paul.Mossman at DWNNICH.OCA.nt.gov.au
To: " - *aussie-weather at world.std.com" [aussie-weather at world.std.com]
Subject: Re: aus-wx: Re: Borroloola Storms
Date: Wed, 1 Dec 1999 07:38:08 +0930
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Howdy Brett & all.............
Yeah I was watching that storm on radar yesterday arvo - seems that Low has not
died yet.
Not only that -Borooloola has had similar falls recently as well. I remember
quite a few '00's in their rainfall totals and posting some to this list.
Gove also recorded heavy rain with I remember getting around 70 odd mm from 9am
- 3pm yesterday.
Maybe Low is starting to organise itself now.
Paul.
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003
Date: Tue, 30 Nov 1999 18:14:42 -0800
From: Lindsay [writer at lisp.com.au]
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To: aussie-weather at world.std.com
Subject: aus-wx: Highest Public Pools in Australia?
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Thanks Michael Thompson on your Lithgow area storm comments.
I have another question for you or any others.
My partner and I were today wondering (after an incredibly cold dip in
our own local pool) if anyone knows what the highest outdoor public pool
in Australia is?
The recent chilly weather in the Upper Blue Mountains has left our local
pool (around 1050 metres in alt.) very cold indeed. Oberon pool would be
around the same alt. as ours and I am wondering if there are any others
in the snowy towns that might be higher? I've noticed in our pool you
have to be careful diving deep to the bottom, it can really stuff your
ears around seemingly worse than pools at sea-level.
Lindsay Pearce.
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004
Date: Wed, 01 Dec 1999 11:25:52 +1100
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: Highest Public Pools in Australia?
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
[snip]
Lindsay wrote on Tue, 30 Nov 1999 18:14:42 -0800:
>
> My partner and I were today wondering (after an incredibly
> cold dip in our own local pool) if anyone knows what the
> highest outdoor public pool in Australia is?
In my travels, I've noticed outdoor ones at Guyra (1325m) and
Armidale (1080m/987m) also. I've had a swim at Oberon (1190m),
Blackheath (1025m) and Katoomba (well below 1030m). All of these
are totally "public" as far as I know. But if you are going for
"open to the public", not necessarily all indoor sheer class and
altitude, the AIS complex at Thredbo (1380m) is hard to beat and
open to the public for very reasonable fees. It has a fully
equipped workout gym, basketball/netball courts, 50m and 25m
heated pools, a water slide that ventures outside, a wading pool
and snow outside in the winter:-) There are also pools within
other snow-based lodges and complexes at Perisher Valley (1735m),
Mt Hotham (1849m), Mt Buller (1707m) and Falls Creek (1767m) that
you can get into if you ask nicely. There's even a spa-pool at
Blue Cow (1905m) but I've never been prepared. One of the ones
at Mt Hotham I hear is really classy with both indoor and outdoor
sections that one can swim between. This is somewhat like I had
the pleasure of experiencing at Aspen (2290m) in Colorado back
in a really snowy January in 1984. As for pool cold extremes,
it's hard to beat Katoomba during one cold outbreak in March
1977, I think. The pool was then unheated and a chilly 12C while
sleet and wet snow came tumbling down briefly at the tail-end of
a strong cold front that passed through during our high-school
swimming carnival! I hope that has wetted your appetite for
chilly dips...
Michael Scollay mailto:michael.scollay at telstra.com.au
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005
From: Patrick_Tobin at ama.com.au
X-Lotus-FromDomain: AMA at TNPN
To: aussie-weather at world.std.com
Date: Wed, 1 Dec 1999 15:18:01 +1000
Subject: aus-wx: Chase update
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Spoke to Michael T at 3.00pm - he is currently in Canberra. A couple of Cb are
visible on the ranges to the west. Michael is going to try his luck along the
Brindabella road to Tumut. The drive should be "interesting" whatever happens
with the storms.....(it can be a pretty rough old road through the mtns).
Upper air seems less favourable today - although what does develop could be
pretty interesting.
Patrick
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006
Date: Wed, 01 Dec 1999 14:22:07 +1100
From: Ben Quinn [bodie at flatrate.net.au]
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Subject: Re: aus-wx: Chase Update
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Hey Ben from Brisbane here..
Some chasers are currently between Dubbo and Orange, heading for
Orange.. so far today they have seen several Cb's, with one nice
overshoot.. the storms are still developing, and the sat pics and radar
look tame at the moment.. but things could be interesting over the next
few hours for them..
The main group split up somewhat, with some people heading straight for
Cobar today.. i think they will all meet up again in the next couple of
days, probably somewhere in western or SW'rn NSW..
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007
From: Paul.Mossman at DWNNICH.OCA.nt.gov.au
To: " - *aussie-weather at world.std.com" [aussie-weather at world.std.com]
Subject: aus-wx: Large storm building
Date: Wed, 1 Dec 1999 14:21:18 +0930
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Howdy all.
Dark mass of storm is building here to the SW at the moment.
Hopefully it will actually get here. Havnt had rain for ages now - need some
wet relief.
Paul at Darwin
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008
Date: Wed, 01 Dec 1999 15:11:42 +1100
From: Ben Quinn [bodie at flatrate.net.au]
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Subject: Re: aus-wx: Chase Update
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Hey Ben from Brisbane here..
Sorry, my mistake.. some of the chasers (Matt Smith, James Harris, Jimmy
D, Ross Portas, James Chambers and Dane Newman) were at Cobar last
night, and drove down to Broken hill today..
So far it's looking reasonably good, a scattering of Cu, some of which
are towering.. and while i was on the phone to Matt Smith he said one of
the towers had just started precipitating..
They will more than likely head down to the Mildura area tomorrow to
meet up with the next system..
Ben Quinn wrote:
>
> Hey Ben from Brisbane here..
>
> Some chasers are currently between Dubbo and Orange, heading for
> Orange.. so far today they have seen several Cb's, with one nice
> overshoot.. the storms are still developing, and the sat pics and radar
> look tame at the moment.. but things could be interesting over the next
> few hours for them..
>
> The main group split up somewhat, with some people heading straight for
> Cobar today.. i think they will all meet up again in the next couple of
> days, probably somewhere in western or SW'rn NSW..
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> -----------------------jacob at iinet.net.au------------------------------
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009
From: wbc at ozemail.com.au (Laurier Williams)
To: aussie-weather at world.std.com
Subject: aus-wx: November weather
Date: Wed, 01 Dec 1999 06:56:21 GMT
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Preliminary figures for November show some interesting anomalies.
Winter-like intrusions of cold southern air and heavier cloud cover
than usual produced extraordinarily low average November temperatures
in widely scattered areas. Giles weather station, in central Australia
400km west of Uluru, recorded an average maximum temperature of 28.3,
6.1 down on normal, and an average minimum of 15.9, down 3.9.
Warburton Airfield, south of Giles, recorded a mean maximum of 26.7,
7.5 below average, but only 21 of the 30 daily observations are
currently available. Other low average maxima were Isisford in central
Queensland 28.3 (-5.5), Murrurundi in the NSW Upper Hunter 22.1
(-5.4), and Armidale University 19.0 (-5.3). Longreach Qld, and
Coonabarabran, Brewarrina and Coonamble in NSW all recorded average
maxima 5.1 or 5.0 below normal.
November rainfall records were broken at many centres in northern Qld
and NT. Some of those with longer periods of record are: Borroloola
389.3 (previous record 219.2 in 90 years), McArthur River Mine 179.0
(136.7, 29 years), Coen Airport 279.6 (274.3, 47 years), Lockhart
River Airport 530.7 (373.3, 43 years), Mt Isa Airport 185.0 (101.4, 33
years), Hughenden PO 216.5 (157.1, 115 years), Cardwell 652.2 (641.2,
127 years), Ingham 784.4 (412.0, 31 years), Isisford 176.4 (156.8, 114
years) and Windorah 116.2 (102.1, 112 years). In Western Australia,
Warburton Airfield recorded 115.4 (83.3, 40 years). At the other
extreme, many stations in southwestern WA recorded their driest
Novembers on record, with several locations, including Jurien, Cape
Naturaliste and Dwellingup, recording no rain at all.
--
Laurier Williams
Australian Weather Links and News
http://www.ozemail.com.au/~wbc/
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010
From: "Ben Tichborne" [tich at netaccess.co.nz]
To: [aussie-weather at world.std.com]
Subject: aus-wx: More NZ storms and flooding
Date: Wed, 1 Dec 1999 20:17:51 +1300
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This time the worst flooding was in the lower North Island, with the
heaviest falls being in the central and eastern ranges. It all began on the
Saturday 27th, when a particularly wintry southerly outbreak spread north
over the South Island, bringing snow down as low as 400 metres in the
south. (unpleasant conditions for voters heading to polling booths) On the
28th the change slowly (like the counting of election votes!) moved onto
the lower North Island. The clash of warm, moist air from the north and the
cold southerly change led to the formation of a low, which moved to the
east the next day, delivering heavy rain as it did so.
Looks more settled for the next few days, with only some weak fronts in a
west to southwest flow.
Ben Tichborne
Christchurch
NZ
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011
X-Mailer: Microsoft Outlook Express Macintosh Edition - 4.5 (0410)
Date: Wed, 01 Dec 1999 18:48:37 +1100
Subject: Re: aus-wx: Automatic Radar Image Analysis - resend
From: "Mark Hardy" [mhardy at magna.com.au]
To: michael.scollay at telstra.com.au
CC: Weather Junkies
Sender: aussie-weather-approval at world.std.com
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Re: aus-wx: Automatic Radar Image Analysis - resend
Michael
Some brief attempts to answer your questions. I suspect that someone from
the BoM may have already given you a more accurate answer by now.
1 They should, but beware of the missing composites for the radars that
also track balloons (eg. Moree, Wagga Hobart et al.)
2 Yes, see above. Eg. Grafton may pick up a local storm but the Moree
composite will not be updated despite other sites in it's broadscale range
being active.
3 Yes, see attached.
4 I believe so.
5 I was told by the BoM that the images are a straight X/Y mapping
centred on the site. I have not thought about the maths of this too deeply
but I suspect it may make it difficult to merge images because there is no
common projection centre.
7 All very difficult to obtain from the GIF images but I admire your
enthusiasm.
The attached will answer your question 3.
8 Automated warnings is an interesting concept. Again using the raw radar
data would be a better option than the GIFs. I believe a project like this
is being developed within the BoM.
Interesting ideas. Looking forward to seeing how they develop. Stay clear of
the warnings though, very tricky area.
RADAR SITE DATA
0 BLANK__ 0.000 0.000 0 0 No Radar
1 Camp_Rd 37.691 144.946 110 2 WF100C-6
2 Melb___ 37.852 144.752 14 5 WSR74C
3 Sydney_ 34.264 150.874 350 7 WSR74S-14
4 WTown__ 32.800 151.833 11 1 WF44
5 Carnvn_ 24.883 113.667 7 3 WF100C-8
6 Gerlton 28.800 114.700 34 3 WF100C-8
7 Bris___ 27.417 153.083 6 1 WF44
8 Kanign_ 25.967 152.583 0 1 WF44
9 Gove___ 12.275 136.823 50 3 WF100C-8
10 Darwin_ 12.417 130.867 30 1 WF44
11 Adel___ 34.950 138.533 4 1 WF44
12 Perth__ 31.953 115.842 10 4 WSR81C-8
13 *TEST*_ 0.000 0.000 0 0 No Radar
14 Gambier 37.750 140.780 69 1 WF44
15 Dampier 20.650 116.687 0 4 WSR81C-8
16 P_Hedld 20.379 118.625 6 1 WF44
17 Broome_ 17.945 122.225 9 1 WF44
18 Weipa__ 12.671 141.922 23 2 WF100C-6
19 Cairns_ 16.817 145.683 652 4 WSR81C-8
20 Twnsvl_ 19.250 146.767 6 2 WF100C-6
21 Mt_Strt 19.350 146.783 580 1 WF44
22 Mackay_ 21.117 149.217 31 1 WF44
23 Gladstn 23.850 151.267 76 1 WF44
24 Mascot_ 33.933 151.167 4 1 WF44
25 AliceSp 23.817 133.900 545 1 WF44
26 PrthA/P 31.933 115.967 12 1 WF44
27 Woomera 31.157 136.803 167 1 WF44
28 Byr_Bay 28.633 153.633 3 0 No Radar
29 Lrmonth 22.104 113.998 0 1 WF44
30 Mildura 34.233 142.083 53 2 WF100C-6
31 Albany_ 34.950 117.800 69 3 WF100C-8
32 Esprnce 33.817 121.833 25 2 WF100C-6
33 Ceduna_ 32.131 133.695 16 2 WF100C-6
34 Lncestn 41.550 147.217 178 0 No Radar
35 Coffs_H 30.317 153.117 5 2 WF100C-6
36 GlfCarp 16.666 139.167 7 4 WSR81C-8
37 Hobart_ 42.833 147.510 3 2 WF100C-6
38 Charlvl 26.417 146.267 304 2 WF100C-6
39 VACANT_ 0.000 0.000 0 0 No Radar
40 VACANT_ 0.000 0.000 0 0 No Radar
41 Willis_ 16.300 149.983 9 3 WF100C-8
42 Tindal_ 14.513 132.446 131 4 WSR81C-8
43 BrisA/P 27.417 153.117 6 1 WF44
44 Giles__ 25.030 128.300 599 2 WF100C-6
45 Eucla__ 31.681 128.892 108 3 WF100C-8
46 Sellick 35.330 138.500 385 4 WSR81C-8
47 R/hmptn 23.383 150.467 14 3 WF100C-8
48 K/grlie 30.785 121.452 360 3 WF100C-8
49 Cobar__ 31.483 145.833 360 3 WF100C-8
50 Marburg 27.608 152.539 372 7 WSR74S-14
51 Lavertn 37.858 144.753 21 1 WF44
52 WTakone 41.181 145.579 400 4 WSR81C-8
53 Moree__ 29.500 149.850 220 3 WF100C-8
54 Kurnell 34.018 151.230 60 8 WSR81C-12
55 Wagga__ 35.167 147.467 221 3 WF100C-8
56 Longrch 23.430 144.290 200 3 WF100C-8
57 E_Sale_ 38.120 147.130 0 1 WF44
58 Invecgl 46.418 168.330 0 3 WF100C-8
59 TESTBED 37.690 144.946 110 0 No Radar
60 Nadi___ 17.763 177.432 16 3 WF100C-8
61 Nausori 18.030 178.560 0 9 WSR74S-12
62 WkShop_ 37.770 145.000 38 3 WF100C-8
63 Berrima 12.457 130.925 51 8 WSR81C-12
257 Subang_ -3.120 101.550 32 6 WSR81S
258 B'worth -5.470 100.380 20 6 WSR81S
259 Kluang_ -2.020 103.320 113 10 MR781S
260 Kuantn_ -3.780 103.220 32 7 WSR74S-14
261 K.Bharu -6.170 102.280 13 7 WSR74S-14
262 B.Lepas -5.300 100.270 28 7 WSR74S-14
263 K.Kina_ -5.930 116.050 27 9 WSR74S-12
264 Kuching -1.480 110.330 57 11 UBS103S
END RADAR SITE DATA
RADAR TYPE DATA
0 No_Radar____ 0 0 0
1 WF44________ 104 30 30
2 WF100C-6____ 53 20 20
3 WF100C-8____ 53 16 16
4 WSR81C-8____ 53 16 16
5 WSR74C______ 53 10 10
6 WSR81S______ 100 20 20
7 WSR74S-14___ 104 19 19
8 WSR81C-12___ 53 10 10
9 WSR74S-12___ 100 21 21
10 MR781S______ 100 20 20
11 UBS103S_____ 100 20 20
12 No_Radar____ 0 0 0
13 No_Radar____ 0 0 0
14 No_Radar____ 0 0 0
15 No_Radar____ 0 0 0
16 No_Radar____ 0 0 0
17 No_Radar____ 0 0 0
18 No_Radar____ 0 0 0
19 No_Radar____ 0 0 0
END RADAR TYPE DATA
Mark
_____________________________________________________
Mark Hardy.
The Weather Company Pty. Ltd.
Level 2, 7 West Street, North Sydney 2060
Ph (02) 9955 7704. Fax (02) 9955 1536.
Mobile 0414 642 739
email: mhardy at theweather.com.au
_____________________________________________________
----------
>From: Michael Scollay <michael.scollay at telstra.com.au>
>To: Aussie Weather <aussie-weather at world.std.com>
>Subject: aus-wx: Automatic Radar Image Analysis
>Date: Tue, 30 Nov 1999 11:44 AM
>
> 1) Will storm areas found within broad-scale radar images that
> have an underlying narrow-scale image always have a corresponding
> storm area within the narrow-scale image?
> 2) Will there any cases of a major storm found within a narrow
> -scale image not having some representation in the broad-scale
> image?
> 3) Does the BoM publish the latitude/longitude of its radar
> sites?
> 4) Do the BoM radar images line up with grid north. If not, what
> do they line up with?
> 5) Are the BoM radar images scaled in a linear fashion. In other
> words can I assume a direct correlation between any two points
> on any BoM narrow-scale radar image to have the same km/pixel
> or Nm/pixel scale?
>
> The next questions relate to storm analysis algorithm output
> info;
>
> 6) Analysing broad-scale radar produces references for the
> narrow-scale image(s) needed. This is mandatory IMHO.
> 7) Storm central position (lat/long), precipitation intensity,
> (mm/hr) extent (sq km) and relative movement (km/hr). What are
> the desired units of measure if different from the above
> suggestions?
> 8) Would it be more valuable to denote the townships or sites
> within the storm track? e.g. "150.10E/-33.91S moving 43 degrees
> (NE) at 32.5km/hr. Katoomba is 26 degrees (NNE) at range 46km."
> Such an output is a lot of work but potentially of more value
> to both storm chasers and the timely issue of automatic
> warnings.
> 9) If reliable, would it be appropriate to issue an automatic
> radar analysis report to aussie-weather? Alternatively, I
> could set up an E-Mail to a given address that is responsible
> for archiving automatic radar analysis reports.
> 10) Given that most supercells track somewhat differently to
> the environmental norm, how can the environmental wind
> direction and rate be determined from successive radar images?
> Is this a useful parameter to evaluate automatically? One idea
> to do this looks at lesser precipitation rate areas and works
> out their movement. This is an extension to the algorithm that
> currently finds intense storm centres within an image.
> 11) Storm hysteresis: How long shall the archive keep radar
> images if the storm dies away and builds up again? 10,20,30,
> 40...minutes?
012
Date: Wed, 01 Dec 1999 17:31:22 +0930
From: Paul Mossman [paulmoss at tpgi.com.au]
X-Mailer: Mozilla 4.08 [en] (Win98; I)
To: aussie-weather at world.std.com
Subject: Re: aus-wx: November weather
Sender: aussie-weather-approval at world.std.com
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Just adding to Lauriers post ............ there is an active Tropical
Depression / Cyclone in the Northern Hemphisphere!
A. TROPICAL CYCLONE SUMMARY:
(1) AT 010300Z4 TROPICAL DEPRESSION 31W WAS LOCATED NEAR
11.0N2 111.1E4, APPROXIMATELY 130 NM EAST-SOUTHEAST OF CAM
RANH BAY, VIETNAM, AND TRACKING WESTWARD AT 7 KNOTS. MAXIMUM
SUSTAINED WINDS ARE 30 KNOTS GUSTING TO 40 KNOTS. SEE REF A (WTPN31
PGTW 010300) FOR FURTHER DETAILS.
Thats not bad - esp since they are just finishing there season.
Paul.
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013
Date: Wed, 01 Dec 1999 20:04:46 +1100
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: [Fwd: aus-wx: Automatic Radar Image Analysis - resend]
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Message-ID: <3844E454.FBA8F719 at telstra.com.au>
Date: Wed, 01 Dec 1999 20:03:16 +1100
From: Michael Scollay [michael.scollay at telstra.com.au]
Organization: Telstra Strategy & Research
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To: Mark Hardy [mhardy at magna.com.au]
Subject: Re: aus-wx: Automatic Radar Image Analysis - resend
References: <199912010748.SAA13771 at xenon.syd.dav.net.au>
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I'll [snip] a lot and answer briefly. Thanks, Mark
for your considered reply. It has helped me a lot...
Mark Hardy wrote on Wed, 01 Dec 1999 18:48:37 +1100:
>
> Michael
>
> Some brief attempts to answer your questions. I suspect
> that someone from the BoM may have already given you a
> more accurate answer by now.
No one from the BoM has commented:-(
> 1 They should, but beware of the missing composites
> for the radars that also track balloons (eg. Moree, Wagga
> Hobart et al.)
My algorithm only fetches and delves into the narrow-scale
image if something was found in the broad-scale composite.
I don't know what happens to those radars that track the
balloons. If that narrow-scale is missing from the composite,
I won't pick it up unless there's a big blob of yellow or
red in the broad-scale.
> 2 Yes, see above. Eg. Grafton may pick up a local storm
> but the Moree composite will not be updated despite other
> sites in it's broadscale range being active.
The hysteresis algorithm may compensate for this. I only
need one broad-scale image to show activity in the narrow-
scale area. Once I've fetched and analysed the narrow-scale
image, the archive will "hang-on" until the storm dissipates.
The trick will be getting that instance in the first place.
Maybe troublesome narrow-scale sites can be fetched, their
image analysed and discarded if there's no activity evident.
The feasibility of this is a function of analysis speed.
> 3 Yes, see attached.
Thankyou for the radar site lat/long stuff...
> 4 I believe so.
I will assume grid-north orientation. From my initial
"plots" of assumed geographic locations for particular
towns, the alignment is so far mostly spot on but there
are some discrepencies possibly because the BoM Obs site
differs from the site location in the radar image.
> 5 I was told by the BoM that the images are a straight
> X/Y mapping centred on the site. I have not thought about
> the maths of this too deeply but I suspect it may make it
> difficult to merge images because there is no common
> projection centre.
I'm not planning to merge since the algorithm is basically
"Find storm(s) in broad-scale then fetch narrow-scale(s).
>From narrow-scale(s) determine distances on a per-image
basis" i.e. I am anticipating differences depending upon
where the towns location is confirmed in the scale. Hoping
they are the same is not a dependency.
> 7 All very difficult to obtain from the GIF images
> but I admire your enthusiasm.
"Tenacity" rather:-) Plus, the analysis algorithm collects
its data in one scan of the image. I tried "bounding-boxes"
and "lines of best fit" etc. but settled on a sort of
area iteration approach that looks for continuous areas
of a particular colour finally settling on the pixel value
corresponding to maxima in both X & Y. It actually works
better at finding updraft locations in classic "hooked
echos" than I expected but is fooled by pure shapes such
as an upside-down triangle. Fortunately, these don't occur
in nature making radar images ideal for this sort of
approach.
> The attached will answer your question 3.
Certainly does.
> 8 Automated warnings is an interesting concept. Again
> using the raw radar data would be a better option than
> the GIFs. I believe a project like this is being developed
> within the BoM.
Q9 I think. Anyhow, to analyse raw radar images would take
immense computing resources as no-doubt the BoM would admit.
I don't have that or access to the raw images. No matter,
for my software to munge 100 broad-scale images takes about
3 seconds per image, so that's under a minute to analyse
all broad-scale sites, not including download which is, on
average, less than 1 second per image. That's enough time
to go get the narrow-scales before the next 10 minute
update. The rest of the time can be spent analysing and
reporting results. I reckon that just analysing the GIFs
is a good proof or unproof of concept
> Interesting ideas. Looking forward to seeing how they
> develop. Stay clear of the warnings though, very tricky
> area.
Quite true. Wait and see. It's not a done deal yet and
quite a way off, particularly as I spend very little time
on it. But the initial trials look very promising - the
power of perl with the GD library (faster execution in C
but much more work).
[snip radar site info and trailing original E-Mail]
Michael Scollay mailto:michael.scollay at telstra.com.au
014
Date: Wed, 01 Dec 1999 20:12:49 +1100
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: ASWA Archive Requests...Update
Sender: aussie-weather-approval at world.std.com
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Good news on this long saga that is also holding up the Winter SN
production. I should be ready to upload outstanding archive requests
commencing from about 16:00 on Friday once firewall Y2K testing is
complete. I will produce a report of what has been successfully
uploaded by the time I leave work on Friday and complete the
outstanding uploads on Monday if all goes well.
Michael Scollay mailto:michael.scollay at telstra.com.au
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015
From: "Pearce" [r_pearce at Dingoblue.net.au]
To: [aussie-weather at world.std.com]
Subject: aus-wx: First chase a failure
Date: Thu, 2 Dec 1999 09:49:11 +1100
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Hi, Matthew from Sydney here
Well, I've just arrived back from my first
"chase" ever, and it was a complete and utter waste of time. After
yesterday's action on the southern ranges, I was suspecting that the ranges may
do something again today, especially as humidity levels were higher. However,
CAPE and LI forecasts were marginal at best, with areas of -1 over the south
coast. So, having nothing much better to do today, I headed SW planning on
reaching Goulburn for lunch and then maybe pushing on to Canberra or going
across to the coast, depending on what was happening. I left St Ives at 9:50am
with some scattered Cu coming in from the NE and 75% relative humidity with 22C.
It was very hazy to the SW.
I reached the Southern Highlands at 11:20am, and observed some
isolated towering cu, which looked promising for later in the day. It was very
warm by this stage, and I pushed on towards Goulburn. After taking an unexpected
detour down some strange gravel road in the middle of nowhere, I reached
Goulburn about 12:30pm. By this stage, the sky was 4/8 covered with Cu, some
towering, and one particularly interesting cell to the E over the ranges. This
decayed within 20 minutes and none of the Cu seemed to be developing, so I
started to get a bit worried. After a check of the radar in Goulburn library, my
worries were confirmed with absolutely nothing on the radar, except for some
showers moving in from the SE towards the coast south of Nowra.
By 1:30pm, the sky was very depressing, with no towers
developing further, so I had to make up my mind whether to head W or SE towards
the coast. Given the radar and the lack of development inland, I decided to head
for the coast, taking the Braidwood road to Batemans Bay. After managing to get
lost in Goulburn trying to find the road out of town, I finally hit the road at
2pm. My brother informed me that the showers out to sea had briefly gone pink on
radar, so I thought, well there's nothing else happening so why not? This
particular part of the journey took a tad longer than expected, and I didn't
arrive at Batemans Bay until 4pm. No clouds, very hot, very humid, very annoyed.
There was, however, some nice congestus over the ranges to the SW, and one cell
developed a pretty pathetic anvil at one point, but had dissipated by the time I
got the camera out.
As nothing else looked like happening, I decided to head for
home, via Nowra and the Princes Highway. This wasn't too bad, and I arrived back
at St Ives at 8:45pm after dinner at McDonalds at South Hurstville in Sydney's
south.
All in all, a useless day, covering 665km, 11 hours and $40
worth of petrol. I have numerous photos of cumulus, but nothing else to show for
it. I just hope my future chases are better than the first!
Matthew
016
Date: Wed, 01 Dec 1999 21:15:25 +0930
From: Paul Mossman [paulmoss at tpgi.com.au]
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Subject: Re: aus-wx: First chase a failure
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Dont Worry Matthew - chasing is alot like life - "if you at first dont
succeed, try & try again..........."
Im sure that with your enthusiasm you will find heaps of supercells
sooner then later and you will forget your first bust chase....
Paul at Darwin.
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-----------------------jacob at iinet.net.au------------------------------
017
Date: Wed, 1 Dec 1999 06:28:10 -0600 (CST)
From: Paul Graham [tornado at hobbiton.org]
To: aussie-weather at world.std.com
Subject: Re: aus-wx: First chase a failure
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
I think the trick is to wait for the right wind conditions -
upper level jet + directional shear through the mid-levels...Perhaps
Saturday for NE NSW...
Presently the winds are very light through all levels and would favour
pulse storms. Probaly give the chasing a miss for a couple of days...
On Wed, 1 Dec 1999, Paul Mossman wrote:
> Dont Worry Matthew - chasing is alot like life - "if you at first dont
> succeed, try & try again..........."
>
> Im sure that with your enthusiasm you will find heaps of supercells
> sooner then later and you will forget your first bust chase....
>
> Paul at Darwin.
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> -----------------------jacob at iinet.net.au------------------------------
>
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| Document: 991201.htm
Updated: 11 December 1999 |
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