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Mike,
Broadly speaking, areas of model-predicted coexistence of cloud (or rain) liquid water with temperatures below 0C
would be areas where there is a threat of icing. Such supercooled liquid water is most likely to form
in regions of upward motion where ice is absent or
present only in very small concentrations, and so is
most likely in clouds that are at temperatures between
0 and -12C. The intensity of icing depends on a variety
of factors, many of which are not included (or not possible to include; for example, aircraft type) in current
weather forecast models. In general, larger forecast mixing ratio of supercooled liquid water would indicate conditions
more favorable for heavier icing. However, to more
directly address your question, there has never been an
attempt that I am aware of to, in effect, simulate flight
through a RUC-forecast cloud to estimate icing potential.
The Aviation Weather Center is responsible for producing
icing forecasts. You might want to consult their Aviation
Digital Data Service (ADDS) web site for more info:
http://adds.aviationweather.noaa.gov
Go to the icing section: there is a nice FYI/Help
that gives additional info on algorithms that are used
to estimate icing potential. The FAA is investing heavily
in research to improve these forecasts, both to improve
the microphysics in the RUC and in better ways to incorporate model forecasts into icing prediction algorithms.
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