On 21/04/2020 16:27, wrote:
On Tuesday, April 21, 2020 at 10:43:11 AM UTC+1, Bernard Burton wrote:
Correction to image address

There is an excellent example of cobblestone cirrus over France this
morning. This cloud arises due to contamintion of the moist upper layers,
probably by Saharan dust in this case. The dust particles provide a vast
store of condensation nuclei, allowing thick ice cloud to form where it
would otherwise be absent or tenuous. This in turn alters the radiation
balance in the upper troposphere, causing the lapse rate to steepen towards
the dry adiabatic rate, and allowing convection to become widespread in the
upper layers of the cloud, and producing the cobblestone appearance.

http://www.woksat.info/etcacd21m/ful...sg-0900-uk.JPG

http://www.woksat.info/etcacd21m/ful...sg-0600-uk.JPG



--
Bernard Burton
Weather data and satellite images at:
www.woksat.info/wwp.html

Interesting Bernard,
Thanks.
I have n't heard that term used before.


New one for me too. I wonder what it looks like from below.


--
Graham P Davis, Bracknell, Berks. Web-site: http://www.scarlet-jade.com/
“Understanding is a three-edged sword. Your side, my side, and the
truth.” [Ambassador Kosh]
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