PHILLY WINTER STORM UPDATE 10:30PM

This Post Was Updated (in italics)

The latest NAM data is coming in as I type this. Looking at the trends-

QPF values have stabilized at about 1.00 inches water.

Temperatures at critical levels levels of the atmosphere decrease enough to support a changeover to snow about 9-11am in Philadelphia, earlier north and west of the city.

Prior to the changeover to snow, expect continued sleet and freezing rain.  So snow changeover may be a bit later than previously thought .

Based on the actual QPF expected to fall as snow and factoring in March sun angle through clouds, I’m thinking that about 6-9 inches fall in Philadelphia and immediate suburbs, 10-12 in far northwest suburbs.

Winds will be high at 30 -35 mph with higher gusts.  

So, the snow transition starts a bit later here and QPF values have decreased somewhat and winds remain a big problem.

important update 11:30pm. Correct winds to 20-25 mph with higher gusts. Reduce snowfall to 4-7 inches in Philadelphia  based on GFS NAM blend 

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