Bernard Burton wrote:

On occasions, air accelerated downwards by evaporative cooling can continue
to descend for a while after all the precipitation has evaporated, and
increasing temperature at the dry lapse rate may lead to it becoming warmer
than its environment. Then its arrival at the surface can lead to a rise in
temperature there, as the deceleration of the descending air takes time, the
restoring force not being very strong.

Bernard Burton
Wokingham, Berkshire, UK.

Satellite images at:
www.btinternet.com/~wokingham.weather/wwp.html
wrote in message
oups.com...

This "downdraught overshoot" is quite rare, at least as far
as I know, but there was a notable case in Guernsey on 30 Jul 1983 (I
think). It must require a very high cloudbase.

Tudor Hughes, Warlingham, Surrey.