"vince" wrote in message

Philip any reports of sleet given its been so cold ? i hear the Luton
carnival has been postponed

I was outside doing the midday ob when the temperature was
at its lowest point, 4.6°C, and it was only rain. I guess sleet is
just about possible, but I'm often of the opinion that reports
of sleet in this sort of set-up are more wishful-thinking than
anything else. Assuming a saturated adiabatic lapse rate, the
freezing level is almost 900m above the ground here (is that
right or am I having a cerebral brown-out?) It may be a little
steeper than that, but not much. Whatever, it's still blinking
cold.

Philip