"Bob Martin" wrote in message
...
in 372979 20130211 103728 John Hall wrote:
In article ,
Dave Cornwell writes:
Or for the youngsters who like online stuff similar here based on
RH:-
http://www.sciencebits.com/SnowProbCalc

(plus a link to the theoretical equations)

Presumably using dry-bulb and dewpoint, or dry-bulb and RH, or dry-bulb
and wet-bulb are all alternative ways of doing what's effectively the
same calculation. (Wet-bulb temperatures seem to have rather gone out of
fashion for some reason. It's surprising, since if the wet-bulb is below
0C you know at once that anything frozen isn't going to melt.)

Snowing steadily here*, temp = 2.2, DP 0.9 and rh 91%

Those valies in http://www.sciencebits.com/SnowProbCalc
say "Very slim change of snow, but don't count on it!"

Interesting.
As a purely theoretical exercise, a 0% RH gives a melting
temperature of 10.5°C.
--
Col

Bolton, Lancashire
160m asl