Regarding the light snow for PHL, today’s model runs have increased the QPF to about 0.15 inches of water for PHL and immediate adjacent areas.   This is a small fraction of the QPF compared to last week’s storms.

With warm temperatures to start and slow chill-down that occurs later this evening, it’s possible we may see a wet coating to maybe about 1/2 inch of snow. Temperatures chill down to about 32 during the early morning hours.

When you’re dealing with such low QPF values, it’s hard to tell how much is model ‘noise’.  (If you’re someone who wants more snow (?), the fact that it’s happening at night is in your favor.)

Whatever falls will result in slippery conditions Tuesday morning for the early commute.

Those of you used to checking in here for the latest NAM update around 9-9:40 pm are reminded that with Daylight Saving Time, the data is available an hour later.  And the GFS data is available after 11:30pm