Here is a peek at the American GFS Global Forecast System numerical
weather prediction model for mid-day December 25, 2009. Areas North of
the blue "540" line (1000mb-500mb critical thickness) would have a
chance of snow if there is precipitation.
The models continue to suggest our active cold and stormy split-flow
jet stream pattern will continue the rest of the month. The GFS has on
and off suggest some pre-Christmas snow in Atlanta. However, this model
shows phantom snows at least a dozen times each winter in its
extended-projection so I never take them seriously beyond 7 days.
Because after that the resolution of the model is reduced so funky
things happen in its projections.
The snow cover map in the slide show is from the American CFS Climate
Forecast System model for the end of January 2010, the end of December
map looked about the same.
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