Since
Evo has
pointed to this thread I thought I might as well revive it with the observation that
wycombe's law of probability
PROB30 = good chance of
PROB40 = very good chance of
is similar to another another natural law covering the forecasting of cloud cover:
FEW = can see the ground quite often really
SCT = Ground visible from time to time in the distance
BKN = Solid overcast, though you may be able to claim you caught a glimpse of the surface within the last half hour
OVC = The only reliable forecast of the lot.
And by the way what happened to Evos 1 to 6? I hope no violence was involved!