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Australian Weather Mailing List Archives: Thursday, 22 July 1999 |
From Subject -------------------------------------------------------------------------------------- 001 "Ben Tichborne" [tich at netaccess.co.nz] Lightning strikes Auckland Skytower 002 John Woodbridge [jrw at pixelcom.net] RE: aus-wx July rainfall - Mt. Crosby wx 003 Michael Scollay [michael.scollay at telstra.com. Charlotte Pass 3pm Obs of 20/7/1999 suspect... 004 Blair Trewin [blair at met.Unimelb.EDU.AU] Deluge hits Melbourne! 005 Paul_Mossman at agd.nsw.gov.au Deluge hits Melbourne! 006 Blair Trewin [blair at met.Unimelb.EDU.AU] Lightning strikes Auckland Skytower 007 Blair Trewin [blair at met.Unimelb.EDU.AU] Charlotte Pass 3pm Obs of 20/7/1999 suspect... 008 Blair Trewin [blair at met.Unimelb.EDU.AU] Melbourne July monthly rainfall 009 Anthony Cornelius [cyclone at flatrate.net.au] Strahan Wx 010 Keith Barnett [weather at ozemail.com.au] Charlotte Pass 3pm Obs of 20/7/1999 suspect... -------------------------------------------------------------------------------------- 001 From: "Ben Tichborne" [tich at netaccess.co.nz] To: [aussie-weather at world.std.com] Subject: aus-wx: Lightning strikes Auckland Skytower Date: Thu, 22 Jul 1999 09:46:11 +1200 X-Mailer: Microsoft Internet Mail 4.70.1161 Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com As a thunderstorn struck central Auckland yesterday, the city's highest building, The Skytower, not surprisingly took the most hits. Go to www.tvone.co.nz/news/ now for a better look at this event. Sydney viewers might be familiar with such a scene. Less spectacular, but thick fog has been affecting Christchurch over the last few days - disrupting the Airport at times. The ground moisture left over from last weekend's rains has helped contribute to the fog. BTW a very cold southerly outbreak is expected over NZ early next week, with one model suggesting thickness levels of 522 or even less over the eastern South Island. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 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------------------------------ -------------------------------------------------------------------------------------- 002 From: John Woodbridge [jrw at pixelcom.net] To: "'aussie-weather at world.std.com'" [aussie-weather at world.std.com] Subject: RE: aus-wx: RE: aus-wx July rainfall - Mt. Crosby wx Date: Thu, 22 Jul 1999 10:29:32 +1000 Organization: Pixel Components 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 Well in fact it wasn't, only down to 8C due to a Westerly which cranked up in the early hours. Looks like we are in for the 6th day running of 0/8 cloud cover. Humidity now well down as one would expect in this Winter pattern. Looks like it will break by the weekend though and return to a SE regime with showers. John. -----Original Message----- From: John Woodbridge [SMTP:jrw at pixelcom.net] Sent: Wednesday, 21 July 1999 22:40 To: 'aussie-weather at world.std.com' Subject: aus-wx: RE: aus-wx July rainfall 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 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------------------------------ -------------------------------------------------------------------------------------- 003 Date: Thu, 22 Jul 1999 10:46:54 +1000 From: Michael Scollay [michael.scollay at telstra.com.au] Organization: Telstra Strategy & Research X-Mailer: Mozilla 4.5 [en] (X11; I; SunOS 5.5.1 sun4m) X-Accept-Language: en 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 Blair Trewin wrote on Wed, 21 Jul 1999 17:34:26 +1000 (EST): > > Michael Scollay wrote on Wed, 21 Jul 1999 10:29:07 +1000 [snip] > > ... 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%. Unfortunately, knowing that there is a problem makes any reasonable historical trend analysis or precipitation problematic or even invalid. At the end of the day, the standard set-out snow-depth measurement course with snow guages at each location is the only way. I can testify in my analysis of such data and specific knowledge of the locale of Spencers Creek that much more rigour is needed. Some examples are that snow-years vary considerably. While maximum accumulation is predominantly on the SE slopes this can vary considerably effectively skewing the record over the course from year to year. An average depth of 300cm might mean 50cm in the open and over 500cm in sheltered areas like in 1981/92. Other years might see 120cm in the open and 200cm in sheltered areas. The average is less, but I would argue that more snow has fallen overall leaving the latter example as the better year. This is caused by the nature of predominant weather systems that bring snow in any particular year. Knowing how the snow fall came about is as important as the snow fall itself, particularly if we are looking at future green-house induced scenario analysis. But one can't do any of this without reliable base historical met data in the first place. My very point about the Charlotte Pass obs anomaly is that it's all very well to postulate as to how it came about, but what can be done to correct the error and better guarantee reliable and precise met data from these areas? I have my ideas but I don't think that many people are interested enough. We have an incredible resource in our mountains, both in terms of its natural beauty, the pleasure it brings to people who use (and abuse) it and the water resource it stores and releases. If climate and weather forecasting could be good enough to predict the quantity of snowfall in anticipation of a seasonal release of melt water to flush our western river systems at the right time of year (instead of the wrong time), huge bonuses are possible in the areas of native fish stock regeneration and proper salination management. We could also put some water back into the Snowy River. All dreams, not of severe weather, I know, but I believe this would be a benefitial future outcome for all involved today and our children who are destined to inherit responsibility for our legacy... (End Soap-box:-) There's a genuine concern herein... Michael Scollay mailto:michael.scollay at telstra.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------------------------------ -------------------------------------------------------------------------------------- 004 From: Blair Trewin [blair at met.Unimelb.EDU.AU] Subject: aus-wx: Deluge hits Melbourne! To: aussie-weather at world.std.com (Aussie Weather) Date: Thu, 22 Jul 1999 11:38:37 +1000 (EST) X-Mailer: ELM [version 2.4 PL23] Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com Melbourne was swept by a deluge this morning. In some areas rain fell continuously for more than five minutes, and some ants were forced to flee their homes as numerous small puddles broke their banks. Rainfall totals in some suburbs are believed to have exceeded a millimetre. (Seriously, the weather in Melbourne recently has been so boring that even the brief approximation of a heavy shower that unloaded itself upon my place around 6 this morning is worthy of comment. The city got the princely sum of 0.4 millimetres). 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------------------------------ -------------------------------------------------------------------------------------- 005 From: Paul_Mossman at agd.nsw.gov.au X-Lotus-Fromdomain: NSW_AG To: aussie-weather at world.std.com Date: Thu, 22 Jul 1999 12:10:00 +1000 Subject: Re: aus-wx: Deluge hits Melbourne! Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com You go Blair!!! The weather here is much the same with that beautiful deep blue sky just going on & on........... At least the water has evaporated....... and its not windy like Sydney. Bring on the next weather event. Paul at Port. Blair Trewinon 22/07/99 11:38:37 Please respond to aussie-weather at world.std.com To: aussie-weather at world.std.com (Aussie Weather) cc: (bcc: Paul Mossman/LCO/NSW_AG) Subject: aus-wx: Deluge hits Melbourne! Melbourne was swept by a deluge this morning. In some areas rain fell continuously for more than five minutes, and some ants were forced to flee their homes as numerous small puddles broke their banks. Rainfall totals in some suburbs are believed to have exceeded a millimetre. (Seriously, the weather in Melbourne recently has been so boring that even the brief approximation of a heavy shower that unloaded itself upon my place around 6 this morning is worthy of comment. The city got the princely sum of 0.4 millimetres). 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------------------------------ -------------------------------------------------------------------------------------- 006 From: Blair Trewin [blair at met.Unimelb.EDU.AU] Subject: Re: aus-wx: Lightning strikes Auckland Skytower To: aussie-weather at world.std.com Date: Thu, 22 Jul 1999 16:35:50 +1000 (EST) X-Mailer: ELM [version 2.4 PL23] Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com > > Less spectacular, but thick fog has been affecting Christchurch over the > last few days - disrupting the Airport at times. The ground moisture left > over from last weekend's rains has helped contribute to the fog. BTW a very > cold southerly outbreak is expected over NZ early next week, with one model > suggesting thickness levels of 522 or even less over the eastern South > Island. > All of the models I've seen (GASP, ECMWF, UKMO) are supporting this for Sunday/Monday. Should be interesting... 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------------------------------ -------------------------------------------------------------------------------------- 007 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: Thu, 22 Jul 1999 16:51:53 +1000 (EST) X-Mailer: ELM [version 2.4 PL23] Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com > > Blair Trewin wrote on Wed, 21 Jul 1999 17:34:26 +1000 (EST): > > > > Michael Scollay wrote on Wed, 21 Jul 1999 10:29:07 +1000 > [snip] > > > ... 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%. > > Unfortunately, knowing that there is a problem makes any > reasonable historical trend analysis or precipitation > problematic or even invalid. At the end of the day, the > standard set-out snow-depth measurement course with snow > guages at each location is the only way. > > I can testify in my analysis of such data and specific > knowledge of the locale of Spencers Creek that much more > rigour is needed. Some examples are that snow-years vary > considerably. While maximum accumulation is predominantly > on the SE slopes this can vary considerably effectively > skewing the record over the course from year to year. An > average depth of 300cm might mean 50cm in the open and > over 500cm in sheltered areas like in 1981/92. Other years > might see 120cm in the open and 200cm in sheltered areas. > The average is less, but I would argue that more snow has > fallen overall leaving the latter example as the better > year. This is caused by the nature of predominant weather > systems that bring snow in any particular year. Knowing > how the snow fall came about is as important as the snow > fall itself, particularly if we are looking at future > green-house induced scenario analysis. But one can't do > any of this without reliable base historical met data in > the first place. I agree with everything you say here. > My very point about the Charlotte Pass obs anomaly is > that it's all very well to postulate as to how it came > about, but what can be done to correct the error and > better guarantee reliable and precise met data from > these areas? My comments here: - the snowfall measurement problem is probably intractable. As I mentioned in a previous message, countries with far more experience in dealing with snow than us (like Finland and Russia) have tried and failed to come up with something adequate. The basic problem is that if the measurement is of snow fallen, it is difficult/impossible to separate falling and blowing snow; if it is of snow on the ground, then this is highly susceptible to drifting, as Michael says, and the amount of snow on the ground at a specific location may not be a good indicator of the amount that has fallen during the season. - it is obvious from the historical record that the recruitment of good observers at alpine sites is a major problem - in particular, ski resort staff have a rapid turnover. Places like Perisher and Falls Creek just don't have many (if any?) people who stay there 12 months a year for 10+ years. I can't see a solution to this problem, short of the Bureau staffing an office itself, which isn't going to happen. - as a result of this, it is likely that most observations in the alpine area are likely to be done by automated stations - good for temperature and pressure, good for wind as long as the equipment doesn't ice up, lousy for frozen precipitation, no good for visual observations (cloud, visibility, snow/rain transition etc.). - much as we'd like to (a recurring fantasy of mine is to be able to retrieve daily temperature data for Australia from the time of the last Ice Age :-) the historical data is history and the fragmented historical records are a fact of life. I think that in 30 years' time we'll have a reasonable climatology from the automated sites established in the first half of the 1990's, but it's pretty limited now. > I have my ideas but I don't think that many people are > interested enough. We have an incredible resource in > our mountains, both in terms of its natural beauty, the > pleasure it brings to people who use (and abuse) it and > the water resource it stores and releases. If climate > and weather forecasting could be good enough to predict > the quantity of snowfall in anticipation of a seasonal > release of melt water to flush our western river systems > at the right time of year (instead of the wrong time), > huge bonuses are possible in the areas of native fish > stock regeneration and proper salination management. > We could also put some water back into the Snowy River. > All dreams, not of severe weather, I know, but I > believe this would be a benefitial future outcome for > all involved today and our children who are destined > to inherit responsibility for our legacy... > (End Soap-box:-) There's a genuine concern herein... Agree with all of this too. There's some work at the back-of-the-envelope stage by someone in BMRC on seasonal snowfall forecasting, which hopefully will become refined with time. 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------------------------------ -------------------------------------------------------------------------------------- 008 From: Blair Trewin [blair at met.Unimelb.EDU.AU] Subject: aus-wx: Melbourne July monthly rainfall To: aussie-weather at world.std.com (Aussie Weather) Date: Thu, 22 Jul 1999 17:02:44 +1000 (EST) X-Mailer: ELM [version 2.4 PL23] Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com Melbourne's currently sitting on 11.8mm for the month, with the progs suggesting that little, if any, rain is likely in the next week. This won't be a record - the current record is 9.4mm in 1979. We are currently in second place (1994 had 12.0mm). There have been ten Julys with less than 20mm. The cutoff for decile 1 (bottom 10% of totals) is 24.1mm. 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------------------------------ -------------------------------------------------------------------------------------- 009 Date: Thu, 22 Jul 1999 18:10:31 +1000 From: Anthony Cornelius [cyclone at flatrate.net.au] X-Mailer: Mozilla 4.6 [en] (Win98; I) X-Accept-Language: en To: aussie-weather at world.std.com Subject: Re: aus-wx: Strahan Wx Sender: aussie-weather-approval at world.std.com Reply-To: aussie-weather at world.std.com Hi Chas, I have a friend down in Tassie (not sure exactly whereabouts) he said there were about 4-5 homes unroofed, and a few large trees down. Anthony from a COLD Brisbane Chas & Helen Osborn wrote: > Hello Everyone > > Just in from the airport 2pm WSW 33G53KT QNH0997 Temp 9C. > > Chas > Strahan Tasmania > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > 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------------------------------ -------------------------------------------------------------------------------------- 010 Date: Thu, 22 Jul 1999 19:51:51 +1000 From: Keith Barnett [weather at ozemail.com.au] X-Mailer: Mozilla 4.6 [en] (Win95; I) X-Accept-Language: en 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 It's a noble thing to be concerned about improving the environment and to be willing and active enough to do something to that end, but, despite all the endeavours in the world to that end, there is still the need for clerical accuracy in the taking of weather readings. The skills of the humble pen-pusher remain paramount even in the highest of scientific endeavours. That goes without saying when the data are used for research. I really think clerical ineptitude, or just plain carelessness, has let the ship down here, rather than any scientific or technical cause. Michael Scollay wrote: > > Blair Trewin wrote on Wed, 21 Jul 1999 17:34:26 +1000 (EST): > > > > Michael Scollay wrote on Wed, 21 Jul 1999 10:29:07 +1000 > [snip] > > > ... 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%. > > Unfortunately, knowing that there is a problem makes any > reasonable historical trend analysis or precipitation > problematic or even invalid. At the end of the day, the > standard set-out snow-depth measurement course with snow > guages at each location is the only way. > > I can testify in my analysis of such data and specific > knowledge of the locale of Spencers Creek that much more > rigour is needed. Some examples are that snow-years vary > considerably. While maximum accumulation is predominantly > on the SE slopes this can vary considerably effectively > skewing the record over the course from year to year. An > average depth of 300cm might mean 50cm in the open and > over 500cm in sheltered areas like in 1981/92. Other years > might see 120cm in the open and 200cm in sheltered areas. > The average is less, but I would argue that more snow has > fallen overall leaving the latter example as the better > year. This is caused by the nature of predominant weather > systems that bring snow in any particular year. Knowing > how the snow fall came about is as important as the snow > fall itself, particularly if we are looking at future > green-house induced scenario analysis. But one can't do > any of this without reliable base historical met data in > the first place. > > My very point about the Charlotte Pass obs anomaly is > that it's all very well to postulate as to how it came > about, but what can be done to correct the error and > better guarantee reliable and precise met data from > these areas? > > I have my ideas but I don't think that many people are > interested enough. We have an incredible resource in > our mountains, both in terms of its natural beauty, the > pleasure it brings to people who use (and abuse) it and > the water resource it stores and releases. If climate > and weather forecasting could be good enough to predict > the quantity of snowfall in anticipation of a seasonal > release of melt water to flush our western river systems > at the right time of year (instead of the wrong time), > huge bonuses are possible in the areas of native fish > stock regeneration and proper salination management. > We could also put some water back into the Snowy River. > All dreams, not of severe weather, I know, but I > believe this would be a benefitial future outcome for > all involved today and our children who are destined > to inherit responsibility for our legacy... > (End Soap-box:-) There's a genuine concern herein... > > Michael Scollay mailto:michael.scollay at telstra.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------------------------------ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 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------------------------------
Document: 990722.htm
Updated: 24 July 1999 |
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