On Fri, 31 Jul 2009 21:43:53 +0100, "Will Hand"
wrote:


Amplification of the flow in the far western Atlantic looks like "buckling
then snapping" the jet turning it south-north with UK on the warm side.
However, we may be close enough for pulses of positive shear vorticity to
move north from Biscay threatening severe thunderstorms. Certainly becoming
much warmer as continental air gets pulled across the UK. 12Z GFS ensembles
are pretty confident about this change.

I have seen on the FNMOC site, that I look at daily, for Friday 1200
what appears to be a thundery development

R

Hilton