A winter storm watch is in effect Monday evening through Tuesday evening for parts of Southeast Pennsylvania and North Jersey. The counties not included in Pa. are Delaware and Philadelphia.
The quick moving storm will head out of the Midwest and into the area by Monday afternoon.
Snow should be developing by the start of the evening rush Monday. As the storm moves over the area, the precipitation will get heavier, but at the same time warmer air will be pulled in from the south and east.
This will change the snow to rain from the southern areas and up through the city. The warm air will not make it much farther north, so the snow will continue to fall to the in those areas and get heavier overnight Monday.
With the temperature where the mixing occurs warming above freezing, there will not be much ice to deal with, but the roads may still be slippery. Any existing ice will be covered with some fresh snow making it slippery as well.
As the storm strengthens off the coast the wind will increase and bring cold air back into the area changing the rain back to snow, but by then the storm is far enough away that the precipitation will be ending.
Here's a list of expected accumulations:
|South Jersey and Delaware||1 inch or less|
|Philadelphia, Pa. suburbs and Central Jersey||1 to 3 inches|
|Lancaster, Reading, Allentown and Lehigh Valley||2 to 5 inches|
|Poconos and above||4 to 8 inches|
In the Poconos and north Jersey 4 to 8 inches is expected with 2 to 5 in the north and western suburbs.
Philadelphia could see between 1 and 3 inches but it will be above freezing and rain could mix in with the snow helping to melt any new snow that falls.
Not much snow is expected across south Jersey and southern DE due to the warmer air and rain falling.
Get the latest on closures and up-to-date radar over in the NBCPhiladelphia.com Winter Weather Center.