Snow is expected to be in the several-inch range in Philadelphia with a significant impact on travel. Exact amounts vary slightly by source but are all in the same general ballpark.
Expected snowfall amount
Most recent forecasts indicate a storm total of about 3 to 6 inches of snow in Philadelphia, with the bulk of it falling from late Saturday night into Sunday morning. The local National Weather Service zone forecast for Philadelphia County specifically mentions total accumulations of 4 to 6 inches by the time the snow ends Sunday morning.
Timing and impacts
Snow is ongoing or developing overnight, with the heaviest rates during the late night and early morning hours, then tapering off by late morning Sunday. Forecasters note that roads will be slow and slippery during the morning, and blowing snow plus rapidly falling temperatures may create black ice and hazardous travel conditions into Sunday.