Excellent display of high Ac, approaching boundary with Cc,
since about 17z here (south Beds). Mostly it's
Ac stratiformis perlucidus, but there are some patches
of lenticular stuff as well, again near boundary between
Ac and Ci.

Philip

Took the dog out and 10.30 last night, and the sky was quite brilliant. The
normal Northampton glow (4 miles S) and Wellingborough glow (6 miles E) were
quite pronounced, but the Kettering glow (10 miles N) was non-existent;
pitch black in that direction. Then off to the west, it was really quite
spectacular. Above a far off line of cloud on the horizon it was bright
blue/white, going through the colours of the rainbow upwards to bright pink.
Never seen anything like it. Then in the space of about 10 minutes, the
temperature plummeted, it started raining and the effect disappeared.

jim, Northampton