Winter Storm Warnings Issued As Snow Arrives In PA: Latest Timing

Forecasters have issued a winter storm warning ahead of a weather system that's expected to drop more than 5 inches of snow on parts of the Delaware Valley, according to the latest forecasts.

In a 4 p.m. update, the National Weather Service said a winter storm warning was in effect for eastern Chester, Delaware, Philadelphia, eastern Montgomery and lower Bucks counties until 1 p.m. Sunday.

"Roads, and especially bridges and overpasses, will likely become slick and hazardous. Plan on slippery road conditions," the National Weather Service wrote.

Total snow accumulations between 3 and 5 inches are expected Saturday night into Sunday morning, forecasters said; however, more than 5 inches could fall in some areas. Snowfall rates of 1 inch per hour are also possible.

"(The) heaviest totals (are expected) along I-95 and locations just southeast of I-95 in southern New Jersey and northern Delmarva," the National Weather Service said.

For the Philly region, precipitation will likely start as light rain before turning to snow around 11 p.m. Saturday. In Bucks and Montgomery counties, snow is expected to start between 9 and 10 p.m. Snowfall intensity may also increase for a time early Sunday morning, forecasters said.

On Sunday, temperatures are expected to drop with highs in the lower 30s and lows down into the teens. The coldest wind chills are expected to settle over the region Sunday night into Monday morning, forecasters said.

"Hypothermia or frostbite could occur with prolonged exposure and lack of proper clothing. Some impacts to infrastructure are possible," the National Weather Service stated. "Wind chills (will be) in the single digits at night."

Here's a look at the detailed National Weather Service forecast for the region:

Saturday: Cloudy, with a high near 43. Southwest wind 5 to 10 mph.

Saturday Night: A chance of rain before 9pm, then rain and snow likely between 9pm and 11pm, then snow after 11pm. The snow could be heavy at times. Low around 26. West wind around 5 mph. Chance of precipitation is 100%. New snow accumulation of 2 to 4 inches possible.

Sunday: Snow likely before 9am, then a chance of snow showers between 9am and 2pm. Mostly cloudy, with a high near 31. Northwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.

Sunday Night: Mostly clear, with a low around 17. Northwest wind 10 to 15 mph.

Monday: Mostly sunny, with a high near 30. Northwest wind 5 to 10 mph.

Monday Night: Mostly cloudy, with a low around 21.

Tuesday: Mostly sunny, with a high near 32.