On Oct 14, 2:54 pm, Len Wood wrote:
Curvature shown by the clouds on this suggest that this is a
mesocyclone.
Moving over IOW and Dorset.http://www.sat24.com/en/gb

Origins?
Inititiated by SST air temp difference possibly. Shallow Cu clouds.

[and]
"Dick" wrote ...

The cloud was the result of an upper low/cold pool which was
indentifiable up to around the 700mb level on the Met Office NAE
model
products.

Dick Lovett


.... indeed Dick: that puddle of colder air really spoilt the day
(Friday/14th) hereabouts; a cracking start and promised a fine day to
come, but rapidly after 09Z, Sc spread across from the east, and at
the same time, because the land had been warming strongly before-hand,
shallow Cu developed, which on other occasions would probably have not
been of any consequence, 'fed' the moist layer above 4000 ft and for a
time late morning/early afternoon, we had 8 oktas cloud, with dark
bases - wouldn't have been surprised to feel a few droplets of rain -
but in the end the afternoon was dry, though cloudy, with the cloud
gradually thinning/weakly breaking. Around dusk, the cloud melted away
to give us a chilly evening & night.

Martin.


--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023