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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.
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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 "
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A COL BH site in East Dartmoor at Haytor, Devon 310m asl (1017 feet).

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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