1000z NNE F4 25km 1Cu025 7Cs220 10.6/04.8 1018.4
1200z NE F5 25km 1Cu032 5As170 7Cs200 12.5/03.7 1018.3
RMK: We've gone almost imperceptibly from really quite
sunny, to really rather grey
1600z NE F5 30km 1CuSc032 5Ci180 6Ci220 11.5/03.7 1019.2
RMK: The Cu has become Sc cugen in some parts of the sky
but not all; the improbably low cirrus is dense in places and
shaded grey, but I'd find it difficult to call it anything else

Philip Eden
Luton (Round Green) 155m