On Wed, 24 Aug 2011 00:24:27 -0700 (PDT), Nick
wrote:
On Aug 23, 11:45*pm, Adam Lea wrote:
On 23/08/11 21:33, John Hall wrote:
Incidentally why the extremely low temperatures? (I think below 15C
in




17-19C (for southern England), and the temperatures observed in
Hereford, etc, suggest this wasn't a particularly cool airmass.

The initial dryness of the low-level air probably had something to do
with it (increased evaporative cooling), as did the timing (no
daytime heating before onset of precipitation). Thickness of the
cloud layer definitely contributed (as discussed in another reply).

--
Freddie
Bayston Hill
Shropshire
102m AMSL
http://www.hosiene.co.uk/weather/cumulus/