Bernard Burton wrote:
"Dave Cornwell" wrote in message
...
I notice on the 10 am radar on both IR and vis a very well defined but
completely isolated clump of thick cloud over the Midlands. I wondered at
first if there had been a fire. Not associated with any rain.
Dave

The patch of cloud to which you refer, Dave, is at about 6000ft-7000ft, and
can be traced back to yesterday's convective activity just east the Welsh
border. The convection was capped at that level, and produced a saturated
area which would probably have been maintained by an absence of dynamic
descent in that layer plus internal convective overturning as a result of
cloud top cooling.
A 3 hourly sequence of imagery can be found at:

http://www.woksat.info/etctg02m/indextg02m.html
----------------------
Thanks Bernard, for the explaination. It now seems to be diffusing
outwards and has in fact caused high level cloud here. A very
interesting image still, as the central area is still surrounded by its
own clear border.
....... and Ron, you are right ;-)
Dave