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Kirk Mellish's Weather Commentary

Posted: 5:23 p.m. Wednesday, Dec. 2, 2009

Model snow 

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By Kirk Mellish

I first mentioned on the radio Monday morning (and internally at the station Nov 22nd) a change to cold enough for snow Thursday-Saturday. The 12Z NAM and GFS today suggested at least snow flurries from I-85 Northwestward with an inch or two in the Mountains toward TN and NC.

The 18Z runs are more split with the NAM keeping flurries to an inch in the mountains and little or none near ATL, while the GFS has flurries all the way to South-Central Georgia and and inch or two in the Mountains and North and West ATL suburbs.

This is models of the weather not the actual weather until it happens. I suspect that even in a "worst case" or best if you love snow, with the time of year and warm pavement any accumulation would just be on grassy areas and rooftops and would melt away soon after precip came to an end.

I prefer 12 and 0Z model runs as a rule but I cant dismiss the possibility of some coating or so but will wait for another run or two of models before committing to more than curiosity snow flurries in Metro ATL Friday night or on Saturday.

I've warned before and in my winter outlook about the problem with systems coming from the data black hole of southern jet stream STJ and the model problems with split-flows. Still, as we've seen since Sept Gulf systems have had a tendency to "out perform" this season.