Latest NAM cranks out several inches of snow by Wednesday morning (4 inches) as the heavy rain Tuesday transitions to snow Tuesday night. This is for PHL airport. More north and west.
The predicted thermal profile of this storm continues to become colder as it moves slowly past us Tuesday night. Stay tuned.
The latest NAM and GFS models are wetter and warmer than previous model runs. Very heavy rain expected most of the day, changing to wet snow about 2-4 pm before ending early evening. Much of the snow won’t accumulate.
Temperatures don’t support much accumulation, both at the surface and a few thousand feet up. Still 1-2 inches most likely on streets and sidewalks, a bit more on grassy surfaces.