"Hi

Thanks for your post - it spurred me into action to generate an 1800 UTC
Synop chart for the day in question:-

https://groups.google.com/forum/#!to...te/Yq5hL13ys0U

Bruce.
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I'm grateful for that--excuse my ignorance courtesy Geography and not
Physics 'A' level knowledge but why divergence rather than convergence
according to your chart?
I did see the cloud structure that day 14/08/75 from London Bridge at approx
17.00 hrs BST and ,without knowing something exceptional would happen,did
observe an isolated cumulonimbus ,relatively quite narrow,powering its way
upwards and at great vertical extent but with no glaciation.
We do study your Google site and are pleased experts like Martin
Rowley,David Smart and your good self et al submit such interesting
contributions.
Until I retire I need to remain anonymous in view the sensitivity of my job
so until then Usenet is for posting.
PC