"Philip Eden" philipATweatherHYPHENukDOTcom wrote :

0850z ENE F2-3 150m FG OBSC 01.0/01.0 1011.9
RMK: Prob little or no cloud above the fog ... my photochromic
specs turned very dark during the ob although the position
of the sun is barely visible ... just a hint of blue at the zenith;
v.slight rime/hoar frost on windward side of grass clumps

1150z ENE F3 150m FG OBSC 03.2/03.0 1015.8
RMK: Vis improved to 250m for a time with 5St000 and
some fairly bright sunshine for a short while

Philip Eden
Whipsnade Obsy 229m Lodge 214m