X-Originating-IP: [216.226.198.147] From: "Steve Baynham" To: aussie-weather at world.std.com Subject: aus-wx: wx chat room Date: Sun, 03 Sep 2000 16:55:15 EST X-OriginalArrivalTime: 03 Sep 2000 06:55:15.0462 (UTC) FILETIME=[E9D18A60:01C01573] Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com heloo all steve in canberra:) anyone know how to access teh weather chatroom on irc via your web browser?? i rmemeber someone giving the address ages ago. can anyone help steve _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com with "unsubscribe aussie-weather your_email_address" in the body of your message. -----------------------jacob at iinet.net.au------------------------------ Date: Mon, 04 Sep 2000 01:16:16 +0930 From: Nathan Thompson X-Mailer: Mozilla 4.73 [en] (Win95; U) X-Accept-Language: en To: aussie-weather at world.std.com Subject: Re: aus-wx: wx chat room Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com Hi Bayns, This is Tiggertoo. heeheh. Um here the URL of Austnet weather chatline is http://www.wn.com.au/karrathaweather/Javachat/ Will see you next time when you hope on the chatline. Bye for now. From Tiggertoo. Steve Baynham wrote: > heloo all > steve in canberra:) anyone know how to access teh weather chatroom on irc > via your web browser?? > i rmemeber someone giving the address ages ago. > can anyone help > steve > _________________________________________________________________________ > Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. > > Share information about yourself, create your own public profile at > http://profiles.msn.com. > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com > with "unsubscribe aussie-weather your_email_address" in the body of your > message. > -----------------------jacob at iinet.net.au------------------------------ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com with "unsubscribe aussie-weather your_email_address" in the body of your message. -----------------------jacob at iinet.net.au------------------------------ Date: Sun, 3 Sep 2000 12:49:24 -0400 From: "Leslie R. Lemon" Subject: aus-wx: Another very hot day To: "INTERNET:aussie-weather at world.std.com" X-MIME-Autoconverted: from quoted-printable to 8bit by europe.std.com id MAA28554 Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com I did fail to mention that our dew points during this heat wave have been 13 to 18 C. Those are not the high dew points of earlier in the season when ours reached 27 C. Les ************************ Leslie R. Lemon Radar, Severe Storms, & Research Meteorologist Tel. 816-373-3533, 816-213-3237 E-Mail: lrlemon at compuserve.com +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com with "unsubscribe aussie-weather your_email_address" in the body of your message. -----------------------jacob at iinet.net.au------------------------------ From: "bussie" To: "weather list" Subject: aus-wx: Clear morning Date: Mon, 4 Sep 2000 07:01:28 +1000 X-Mailer: Microsoft Outlook Express 5.50.4133.2400 Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com A clear morning here at present and 1 degrees. Bussy (NE Victoria) +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com with "unsubscribe aussie-weather your_email_address" in the body of your message. -----------------------jacob at iinet.net.au------------------------------ From: David Hart To: "aussie-weather at world.std.com" X-Originating-IP: [208.192.101.11] Date: Sun, 3 Sep 2000 21:6 -0000 X-mailer: AspMail 2.62 (SMTP85107B) Subject: aus-wx: Test - Please Ignore Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com Test - Please Ignore 20:04 3-Sept-2000 __________________________________________________________________ Get your free Australian email account at http://www.start.com.au +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com with "unsubscribe aussie-weather your_email_address" in the body of your message. -----------------------jacob at iinet.net.au------------------------------ From: "David Findlay" To: Subject: aus-wx: Tornado Warnings from Lightning Detection Date: Mon, 4 Sep 2000 08:02:39 +1000 X-Mailer: Microsoft Outlook 8.5, Build 4.71.2173.0 Importance: Normal Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com I just saw a news report about tornadoes being spawned after sudden surges of lightning activity. I was just thinking, that maybe with the lightning detector unit I want to build, and some data from the NSSL, and other effects seen on echo radar and wind observations, we may be able to give each storm within the area of a network described in my previous post a rating of it's likelihood to produce a tornado. Any ideas? David Findlay +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com with "unsubscribe aussie-weather your_email_address" in the body of your message. -----------------------jacob at iinet.net.au------------------------------ Date: Sun, 3 Sep 2000 21:44:48 -0400 From: "Leslie R. Lemon" Subject: aus-wx: Tornado Warnings from Lightning Detection To: "INTERNET:aussie-weather at world.std.com" X-MIME-Autoconverted: from quoted-printable to 8bit by europe.std.com id VAA26265 Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com David Finlay wrote: > I just saw a news report about tornadoes being spawned after sudden surges > of lightning activity. I was just thinking, that maybe with the lightning > detector unit I want to build, and some data from the NSSL, and other > effects seen on echo radar and wind observations, we may be able to give > each storm within the area of a network described in my previous post a > rating of it's likelihood to produce a tornado. Any ideas? Yes, in many supercellular storms there does seem to be a correlation between a precipitous drop in a previously measured very high intercloud and intracloud lightning rate and tornado production. This has not yet been sufficiently studied to know what this means or its cause and thus has not yet been used as a "tornado precursor" or warning tool. In the mid 1970's I noted a dramatic drop in the tornadic storm echo top, the disappearance of the radar detected bounded weak echo region, and weakening in reflectivities during tornado prediction. I called this the collapse phase of the storm and concluded it was associated with a decline in updraft size and strength and an increase in downdraft. Fujita also observed the same decline in echo top from the vantage point of very high flying jet aircraft during the same period. These observations were published and integrated into a new (at that time) radar warning technique. Personally, I believe that the rapid decline in intercloud lightning is associated with the same radar observations. There has also been identified a similar occurrence prior to micro- or downburst occurrence. Once again, this is not understood. But note that today conventional lightning detectors detect and measure cloud to ground (CG) lightning and not the lightning most correlated to tornado or microburst occurrence. However, I say all this not to discourage your work. Continue to pursue your ideas but don't forget to attempt to learn more of what I have written and attempt to integrate these observations into your research. Les ************************ Leslie R. Lemon Radar, Severe Storms, & Research Meteorologist Tel. 816-373-3533, 816-213-3237 E-Mail: lrlemon at compuserve.com +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com with "unsubscribe aussie-weather your_email_address" in the body of your message. -----------------------jacob at iinet.net.au------------------------------ From: Blair Trewin Subject: Re: aus-wx: Very hot weather continues ........ To: aussie-weather at world.std.com Date: Mon, 4 Sep 2000 14:21:48 +1100 (EST) X-Mailer: ELM [version 2.5 PL2] Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com > > Paul in Darwin wrote: > > > Very hot weather continues for Top End NT today - some places > > pushed 37C. While not record breaking yet - this is unusual for this > > The list might find this of interest. We, here in the Central Plains of > the US are in the midst of the worst heat and dry spell sense the dust bowl > days of the 1930's. From Texas northward through Oklahoma, west Arkansas, > all of Kansas, most all of Missouri and southern parts of Nebraska and Iowa > the heat has been relentless for several weeks now. There has been a very > strong upper level ridge anchored over these areas causing widespread > airmass subsidence. As you know, sinking air heats. The daily high > temperatures are ranging from about 40 C to about 44C in most places. Here > at my home it is reaching daily high temperatures of 41 C to 43 C. Night > time temperatures have been ranging from 22.5 to 27. Moreover, all of the > above areas have had little if any rain in the last 60 to 80 days. > > So, it can always be worse, I guess. I can look on the bright side: I > have not had any water seepage into my fully finished basement (where my > office is) all this year so far. Dallas, which I keep reasonably close track of, has had no rain in either July or August. The August mean maximum was 38.7, short of the levels of July 1980 (which is the benchmark for southern US heatwaves) but still 3.4 degrees above average, a big deviation for a subtropical site. Contrary to popular belief (many people think Texas is virtually desert), eastern Texas is not particularly dry; the Dallas area has a mean annual rainfall in the 800-900mm range, with July and August monthly means around 50mm. It has been an exceptional American summer for persistence of weather patterns; the northwest has been consistently dry and hot, the northeast persistently cool and wet (as tennis fans would know) - New York had its fourth coolest July on record - and the south dry and hot. All patterns have been unrelenting, with strings of up to 30 consecutive days above or below normal commonplace (it is only in the last few days that many north-central locations have had their first 90 F day of the summer, a mark they would typically reach 20-30 times per year). Northern Australia has also been hot too, with WA, Queensland and the NT all getting within a degree or so of their August records last week. Whilst the SOI is near zero this year, it is actually interesting to note that there is a strong positive correlation between the SOI and the likelihood of extreme high temperatures north of about 20 S in spring (i.e. hot days are more likely in La Nina years). This reverses completely in summer. Blair Trewin +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com with "unsubscribe aussie-weather your_email_address" in the body of your message. -----------------------jacob at iinet.net.au------------------------------ From: "John Woodbridge" To: Subject: RE: aus-wx: Tornado Warnings from Lightning Detection Date: Mon, 4 Sep 2000 13:24:04 +1000 X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2911.0) Importance: Normal Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com Some speculation from me... I have noted on a number of occasions, a sudden surge in the CG rate just prior to the onset of a severe stage of a storm, i.e, strong downburst. This was particularly evident with the Jan 91 Sydney storm, which produced a truely awesome array of CG's just before it cleaned up Turramurra. One theory I had was that the sudden discharge rate lowered the electric field within the cloud allowing preciptation particles which were partially suspended by virtue of static force to fall, thus initiating the downdraft. A much better theory perhaps is that the onset of the downdraft moves a huge volume of highly charged particles closer to the ground - resulting in rapidly increasing electric field strength and consequent rash of CG's. This latter theory would presumably coincide with a drop in CC's as the charged mass is relocated downwards and would also coincide with drop in cloud top. Presumably this mass originates from somewhere near the top of the updraft, and in a supercell, is falling outside but adjacent to the updraft area, by virtue of updraft shear. I speculate that the loss of a large airmass close to the top of the updraft in this scenario presumably has the effect of partially lowering air pressure in that region acting to temporarily accelerate the updraft. If the downdraft is in the form of a RFD, then the factors required for tornado production would seem to come together. The problem as I see it, is that this event is much to close to actual Tornadogenisis for warnings to be of much use. I would tend to think that radar imagery of storm structure and storm severity are perhaps better indicators to use for Tornado warnings. Regards, John. >sniP David Finlay wrote: > I just saw a news report about tornadoes being spawned after sudden surges > of lightning activity. I was just thinking, that maybe with the lightning > detector unit I want to build, and some data from the NSSL, and other > effects seen on echo radar and wind observations, we may be able to give > each storm within the area of a network described in my previous post a > rating of it's likelihood to produce a tornado. Any ideas? Yes, in many supercellular storms there does seem to be a correlation between a precipitous drop in a previously measured very high intercloud and intracloud lightning rate and tornado production. This has not yet >been sufficiently studied to know what this means or its cause and thus has not yet been used as a "tornado precursor" or warning tool. In the mid 1970's I noted a dramatic drop in the tornadic storm echo top, the disappearance of the radar detected bounded weak echo region, and weakening in reflectivities during tornado prediction. I called this the collapse phase of the storm and concluded it was associated with a decline in updraft size and strength and an increase in downdraft. Fujita also observed the same decline in echo top from the vantage point of very high flying jet aircraft during the same period. These observations were published and integrated into a new (at that time) radar warning technique. Personally, I believe that the rapid decline in intercloud lightning is associated with the same radar observations. There has also been identified a similar occurrence prior to micro- or downburst occurrence. Once again, this is not understood. But note that today conventional lightning detectors detect and measure cloud to ground (CG) lightning and not the lightning most correlated to tornado or microburst occurrence. However, I say all this not to discourage your work. Continue to pursue your ideas but don't forget to attempt to learn more of what I have written and attempt to integrate these observations into your research. Les +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com with "unsubscribe aussie-weather your_email_address" in the body of your message. -----------------------jacob at iinet.net.au------------------------------ Date: Mon, 04 Sep 2000 16:56:09 +1000 From: Andrew Miskelly X-Mailer: Mozilla 4.72 [en] (Win98; I) X-Accept-Language: en To: Aussie Weather Subject: aus-wx: OFFTOPIC: Odd Forecast Note Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com Hi all, As many of you will have noticed, the BoM are including a note in their forecasts if the Olympic Torch Relay is passing through the area on one of the days. I have found it rather odd over the last few days that the note for the 'Bowral - Goulburn - Capital Hill' leg has been included in the Central Tablelands forecast and not on the Southern Tablelands forecast. If you look at the district boudarys map (http://www.bom.gov.au/weather/nsw/dist_map.shtml) you will find that Bowral is in the Illawarra and the other two locations are well and truely on the Southern Tablelands. If this is infact not the case then I have been looking at the wrong forecasts for a very long time! Andrew. -- Andrew Miskelly Illawarra/Southern Tablelands, NSW amiskelly at ozemail.com.au +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com with "unsubscribe aussie-weather your_email_address" in the body of your message. -----------------------jacob at iinet.net.au------------------------------ From: "bussie" To: "weather list" Subject: aus-wx: Short burst Date: Mon, 4 Sep 2000 23:43:37 +1000 X-Mailer: Microsoft Outlook Express 5.50.4133.2400 Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com A short burst of Lightning and thunder, about a half dozen strikes, and a drizzle of rain at 11.30pm. Quite close but short lived. Bussy (NE Victoria) +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com with "unsubscribe aussie-weather your_email_address" in the body of your message. -----------------------jacob at iinet.net.au------------------------------