Waghorn wrote in message ...
Now stopped in SE London after 11/2 hrs + of mod-hvy rain and p'haps hail with
a number of lightning
flashes.But the tops are relatively warm in IR-
http://www.sat.dundee.ac.uk/abin/pro...29/project.ch4
..jpg

Anybody care to diagnose this ?The trough must be engaging some relatively wam
and moist air to
produce this intense rain,


Hi David, I think you are right, as the surface low moved north colder air in
depth pushed east and the PV forcing associated with the trough released the
potential instability with dramatic consequences. Subsidence and a touch of
negative vorticity advection gave the SE and other parts a fine and dry day
until late/afternoon and evening of course !

Will.
--

" A cup is most useful when empty "
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