Saturday Snow Update- (Fri Noon Edition)

The latest GFS and NAM data has become available and there are some new wrinkles in predicting the snow totals.  The QPF values are still in the general 0.30-0.40 inch range, which if cold enough, could translate into 3-5 inches of snow for Philadelphia.

BUT, the latest track of the storm is close enough that some warm air in the upper levels of the atmosphere will mix in during the mid-day hours, especially in PHL and eastward.   This means that we will wake to some accumulation of snow at daybreak Saturday, but there’s now a strong possibility that it will mix with freezing rain and some sleet during the late morning and early afternoon, greatly reducing snow totals.   Areas in NJ will be even warmer aloft, with more sleet, rain and freeezing rain.  Areas to the west of PHL will have less QPF (“Quantity of Precipitation Falling”), but will likely remain mostly snow.

More info later this afternoon and tonight.  Stay tuned.

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