"Philip Eden" philipATweatherHYPHENukDOTcom wrote :

0850z RTD
NNW F1 20km VCFG SKC -01.0/-01.8 1041.1
RMK: Vale of Aylesbury filled with fog; fog top approx
170-180m amsl. Copious hoar ... some rime too, for
instance about 4mm on rain-gauge rim. Did notice some
patchy shallow fog drifting from the north across the
summit of the Downs after 00z last night. Lack of wind
means that it actually feels quite warm in the sun ... vis
above the fog is good and the sky is a moderately deep
blue. (Photos to follow when I have the time).

1150z NW F2 25km VCFG SKC 00.5/-01.1 1040.8
RMK: Top of fog shows a fair bit of turbulence now,
but the level is still about 180m. Bar this morning was
the highest since 15 Dec 2001.

Philip Eden
Whipsnade 214m