haaark wrote:
On Jul 3, 12:44 pm, Dave Cornwell wrote:
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
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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- Hide quoted text -

- Show quoted text -

A fascinating radar sequence. 3 hrs ago it was surrounded by cumulus .
Now the patch has presumably gone, as the area has been taken over by
cum. How interesting, Bernard, that it comes out at 6-7000 ft- to me
it could have been ground mist
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Still interesting in that you usually see things changing in a linear
direction but this is expanding radially, like a slow motion explosion,
gradually engulfing most of England.
Dave