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uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged. |
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#1
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Hi,
Layperson question. Has a supercell TS ever been recorded in the UK before? Much has been made of the discovery of the supercell in the UK, but was this discovery made from observing other countries, or from an actual occurrence in the UK? Simon |
#2
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Simon,
No doubt the storm of Friday Sept. 5th 1958 was in the super cell class and incidentally fired my enthusiasm for the Weather. I believe the Wokingham storm in 1959 could be put into this category as well but overall they are relatively uncommon. Ian Currie -Coulsdon www.frostedearth.com "Simon Wyndham" wrote in message ... Hi, Layperson question. Has a supercell TS ever been recorded in the UK before? Much has been made of the discovery of the supercell in the UK, but was this discovery made from observing other countries, or from an actual occurrence in the UK? Simon |
#3
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On Sun, 18 Apr 2004 09:12:22 +0000 (UTC), Simon Wyndham
wrote: Hi, Layperson question. Has a supercell TS ever been recorded in the UK before? The Hampstead storm of August 1975 was a supercell. Google on Hampstead storm for details. As for their frequency, stormchasers and recorder/researchers such as Les Crossan and Trevor Harley might have an idea, I would guess about once a decade. JPG Much has been made of the discovery of the supercell in the UK, but was this discovery made from observing other countries, or from an actual occurrence in the UK? Simon |
#4
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![]() "JPG" wrote in message ... On Sun, 18 Apr 2004 09:12:22 +0000 (UTC), Simon Wyndham wrote: Hi, Layperson question. Has a supercell TS ever been recorded in the UK before? The Hampstead storm of August 1975 was a supercell. Google on Hampstead storm for details. As for their frequency, stormchasers and recorder/researchers such as Les Crossan and Trevor Harley might have an idea, I would guess about once a decade. JPG Much has been made of the discovery of the supercell in the UK, but was this discovery made from observing other countries, or from an actual occurrence in the UK? Simon But about Hampstead here http://www.weather-uk.com/hampstead/page3.html |
#5
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I'm sure Supercells are much more common than once ever 10 years - they are
just not reported as such. In particular the "Shallow Supercell". There was a possible Shallow Supercell reported in Oxfordshire in March - unconfirmed though. Mark. "Joe, Bedford." wrote in message news:adugc.19018$4N3.18154@newsfe1-win... "JPG" wrote in message ... On Sun, 18 Apr 2004 09:12:22 +0000 (UTC), Simon Wyndham wrote: Hi, Layperson question. Has a supercell TS ever been recorded in the UK before? The Hampstead storm of August 1975 was a supercell. Google on Hampstead storm for details. As for their frequency, stormchasers and recorder/researchers such as Les Crossan and Trevor Harley might have an idea, I would guess about once a decade. JPG Much has been made of the discovery of the supercell in the UK, but was this discovery made from observing other countries, or from an actual occurrence in the UK? Simon But about Hampstead here http://www.weather-uk.com/hampstead/page3.html |
#6
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The Wokingham Hailstorm (which was a forward flank updraught hp supercell)
of 1959 was when the supercell structure was first postulated - this was the first storm ever to be extensively tracked on radar. There's more on these events in the usw FAQ / glossary. They are not common in the UK (once every 10 years or so) = but = smaller scale rotating single cells (misocyclones or mini-supercells!) may well be... i've got a pic of a local smaller scale rotating single cell event in my photograph gallery he http://82.39.122.1/Images/inflow.jpg which shows an inflow band into a rotating single cell thunderstorm event. Les "Simon Wyndham" wrote in message ... Hi, Layperson question. Has a supercell TS --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.659 / Virus Database: 423 - Release Date: 15/04/2004 |
#7
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The Wokingham Hailstorm (which was a forward flank updraught hp supercell)
of 1959 was when the supercell structure was first postulated - this was the first storm ever to be extensively tracked on radar. There's more on these events in the usw FAQ / glossary. They are not common in the UK (reported once every 10 years or so) = but = smaller scale events (rotating single cells of shallow vertical extent / misocyclones / mini-supercells!) may well be... i've got a pic of a local smaller scale rotating single cell event in my photograph gallery he http://82.39.122.1/Images/inflow.jpg which shows an inflow band into a rotating single cell thunderstorm in deep cold air. Les "Simon Wyndham" wrote in message ... Hi, Layperson question. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.659 / Virus Database: 423 - Release Date: 15/04/2004 |
#8
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Thanks Les - nice photo by the way.
What were your thoughts on the event in Oxfordshire last month then ? I have to admit I'm certainly no expert - but the arguments seemed to hold credance to me. http://www.eots.co.uk/IsostormMar04/Page1.htm Mark. "Les Crossan" wrote in message ... The Wokingham Hailstorm (which was a forward flank updraught hp supercell) of 1959 was when the supercell structure was first postulated - this was the first storm ever to be extensively tracked on radar. There's more on these events in the usw FAQ / glossary. They are not common in the UK (reported once every 10 years or so) = but = smaller scale events (rotating single cells of shallow vertical extent / misocyclones / mini-supercells!) may well be... i've got a pic of a local smaller scale rotating single cell event in my photograph gallery he http://82.39.122.1/Images/inflow.jpg which shows an inflow band into a rotating single cell thunderstorm in deep cold air. Les "Simon Wyndham" wrote in message ... Hi, Layperson question. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.659 / Virus Database: 423 - Release Date: 15/04/2004 |
#9
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![]() ================================================== ================== This posting expresses the personal view and opinions of the author. Something which everyone on this planet should be able to do. ================================================== ================== I thought Hampstead (1975) was a multi-cell that happened to regenerate in the same place due to ideal upper wind configurations ? For a supercell you need a low modified Richardson number (CAPE/helicity 10), high CAPE itself (1000 J/Kg), massive directional and speed wind shear in the lowest 2 km of atmosphere and a rotating updraught. I will be a bit controversial and say that true supercells have not been observed in the UK. But I'm willing to be proved wrong given unequivocal observational evidence. Will. -- " A cup is most useful when empty " ------------------------------------------------------------------------------- A COL BH site in East Dartmoor at Haytor, Devon 310m asl (1017 feet). mailto: www: http://www.lyneside.demon.co.uk DISCLAIMER - All views and opinions expressed by myself are personal and do not necessarily represent those of my employer. ------------------------------------------------------------------------------- JPG wrote in message ... On Sun, 18 Apr 2004 09:12:22 +0000 (UTC), Simon Wyndham wrote: Hi, Layperson question. Has a supercell TS ever been recorded in the UK before? The Hampstead storm of August 1975 was a supercell. Google on Hampstead storm for details. As for their frequency, stormchasers and recorder/researchers such as Les Crossan and Trevor Harley might have an idea, I would guess about once a decade. JPG Much has been made of the discovery of the supercell in the UK, but was this discovery made from observing other countries, or from an actual occurrence in the UK? Simon |
#10
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That looks like a misocyclone event that you have recorded. A good case for
Doppler Radar in the UK. Cracking Pics. Depending on response here I may post up the paper that started it all on my webserver .... the analysis of the Wokingham storm. Meanwhile there's one scan already there from "Airflow in Convective Storms" from 1962 paper he http://82.39.122.1/Images/wokingham2.jpg the similarities are pretty striking. The scan is from the RMS, volume 88, 376, April 1962, thank you Les Lemon / Keith Browning. Les --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.659 / Virus Database: 423 - Release Date: 15/04/2004 |
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