I've just experienced some of the heaviest rain I have ever seen in this
country. According to the Davis VP 9.6 mm fell in just over 4 minutes
from 1830 BST, with a maximum rate of 236 mm/hour. The rain was
accompanied by one loud clap of thunder.

Norman.
(delete "thisbit" twice to e-mail)
--
Norman Lynagh Weather Consultancy
Chalfont St Giles
England

Torrential here too at times in Coulsdon with 9.4mm recorded in half an hour
from 19.00 hrs. Another heavy shower has just started at 20.00hrs. Some
spectacular lightning as well with again some loud thunder reverberating
over the Downs. This is the 32nd day with thunder this year and is by
several days the most thundery in my record back to 1979 in area.

Ian Currie-Coulsdon.


"Norman Lynagh" wrote in message
...
I've just experienced some of the heaviest rain I have ever seen in this
country. According to the Davis VP 9.6 mm fell in just over 4 minutes
from 1830 BST, with a maximum rate of 236 mm/hour. The rain was
accompanied by one loud clap of thunder.

Norman.
(delete "thisbit" twice to e-mail)
--
Norman Lynagh Weather Consultancy
Chalfont St Giles
England

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...roject.ch4.jpg

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

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

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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In uk.sci.weather on Sun, 24 Oct 2004 at 17:44:27, Norman Lynagh wrote :
I've just experienced some of the heaviest rain I have ever seen in this
country. According to the Davis VP 9.6 mm fell in just over 4 minutes
from 1830 BST, with a maximum rate of 236 mm/hour. The rain was
accompanied by one loud clap of thunder.

Had a pretty beefy shower come through here at around 4.30pm yesterday,
about 7mm in 10 mins.
--
Paul Hyett, Cheltenham

Hi David,......... 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.........
Will.
Cheers Will,
Herstmonceux 00Z shows instabilty but vertical development limited by slightly drier and warmer air
aloft

http://weather.uwyo.edu/cgi-bin/soun...500&STNM=03882

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

"Waghorn" wrote in message
...
Hi David,......... 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.........
Will.
Cheers Will,
Herstmonceux 00Z shows instabilty but vertical development limited by
slightly drier and warmer air
aloft


http://weather.uwyo.edu/cgi-bin/soun...500&STNM=03882

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

Hi David,

It clearly shows too the conditional instability aloft as well as
considerable speed shear in the lowest layers, it's not surprising we had
such vigourous storms.

Joe