On Mar 15, 7:26*pm, "Ian Currie" wrote:
A real thunder type summer sky seen today in Surrey and Sussex with
altocumulus almost of the castellanus variety and a sultry feel to the early
afternoon. In summer it would have been a hot day breaking down to
widespread storms. I wish I had kept a record of such days over the years to
see any pattern to the first date of a thundery sky observed. Must have a
more detailed look at my records.

Ian Currie, Coulsdon.www.frostedearth.com

It certainly looked like that, and later there was a lot of
rather threatening-looking middle level stuff. But there was no drama
to follow, just moderate rain at worst with a temperature of about
9°C. Oh, well, a nice summer while it lasted.

Tudor Hughes, Warlingham, NE Surrey, 556 ft.