,He says (and after observing
yesterday's fireworks I agree with him) that there was a gentle south-east wind,
and the prevailing wind has rarely been in the south-east during the last 10
years or so, so the scenario for good storms here seems to be that some of
London's heat is wafted towards us on SE winds, and then with the right
conditions, all hell breaks loose when the said hot humid air is lifted as it
hits the Chilterns. Not a Spanish plume as such, but a London plume!!

Nigel
Nice idea.
Output from the GFS and the 22km NMM suggested a cyclonic surface circulation S or SW of London
under the upper vortex.The first two cells seem to have triggered over SW london (see 1148 NOAA
image),so that fits.
The rest of the line out to the Severn grew in a break in the cloud cover (also see 1148pass).
ther,weaker cells triggered due south of London over Kent or Sussex.

http://www.sat.dundee.ac.uk/abin/pro...roject.ch2.jpg
( Can't get into BB @Wokingham ATM )

--
regards,
david
(add 17 to waghorne to reply)