The existance of moisture in the liquid state is, of course, the heart of
the problem. Since liquid water is unstable below 0C it will always be
somewhat hit and miss but my own experience is that if there is any lifting
activity then there will be ice in the (cumulus type) clouds. Also any
clouds with "hard" (as opposed to feathered) edges are full of ice.

Mike
MU-2

edges "Matthew S. Whiting" wrote in message
...
Mike Rapoport wrote:
Please reread the word "liquid".

Mike
MU-2


"Matthew S. Whiting" wrote in message
...

Mike Rapoport wrote:

Ice is "known" to be present anytime there is visible moisture in the

liquid

state and the temp is below freezing. There will ALWAYS be icing under
these conditions. Always, no exceptions.

Depends on how you interpret icing. I've flown for more than an hour
through ice crystals that were visible in the air, but which did not
accumulate on the airframe of my C-182. If I'm not accumulating ice on
the airframe, I don't consider it to be "icing conditions." Same as
flying through snow. I've flown through snow for literally hours and
never accumulated any on the airframe.


Matt

Gotcha, however, I don't think that is the criterion the NWS uses when
making forecasts of icing conditions. If it is, I'm impressed.
Certainly hasn't been my experience in the northeast during the winter
months.


Matt