The 1 AM NAM model run has extended the duration of the light snow to about 10-11 AM. Expect possibly an additional 1/2 inch of snow after sunrise in PHL and immediate surrounding suburbs.
Temperatures are expected to drop below freezing, causing icy conditions.
Tonight’s NAM data just rolled in. QPF values are again very low in the immediate PHL area, about 0.09 inches water. With some of that falling before surface air temperatures fall to 32, it would appear that the best guess is a coating to 1 inch in PHL and the immediate suburbs.
Areas farther north and west may have 2, possibly 3 inches.
The biggest issue, regardless of accumulation, will be that any wet accumulations will become icy in the morning, with temperatures dropping below freezing for a time. Stay safe!