Light snow will continue to fall Tuesday afternoon and evening.
Little additional accumulation is expected through the afternoon and evening rush but the temperatures will remain below freezing. This may result in some slippery roadways, especially side streets, bridges, and overpasses.
The main "punch" of the storm begins tonight after the evening rush hour.
A winter storm warning is in effect for the Philadelphia area tonight with a winter weather advisory closer to the coast.
All warnings and advisories are active tonight and tomorrow morning.
Snow will develop and clouds will become heavy early Tuesday night.
Accumulations around Philadelphia could be as high as 3 inches with more to the north and less to the south.
The snow will accumulate Tuesday night and early Wednesday so expect to see that as you wake up Wednesday morning.
Warmer air will be moving in by Wednesday morning from south to north, which will cause a changeover from snow to rain.
Along with more snow up north, this changeover combined with temperatures remaining below freezing, will result in some icing.
A quarter inch of ice is possible on top of the snowfall north and west of the Philadelphia area.
Eventually the temperature in the Lehigh Valley should rise above freezing but roads and untreated surfaces will still have a coating of ice.
Wednesday evening the storm could end with a period of heavy rain everywhere.
The temperature by this time will be above freezing.