EASTERN PENNSYLVANIA — Forecasters continue to watch a “large winter storm” that could bring snow and and rain to Eastern Pennsylvania over the weekend.

The National Weather Service has issued a Hazardous Weather Outlook for the system, saying accumulating snow is expected Saturday. It will likely change to a wintry mix by Saturday night, forecasters predict.

Some parts of northern Pennsylvania could see as much as a foot of snow as part of this system, AccuWeather is predicting. However, the Philadelphia region will likely see much less. Forecasters expect about one to three inches locally; some areas further north of the city may see up to five inches, The Weather Channel said.

The current estimated timing for the storm is that it will begin with snow early Saturday and then switch to sleet in the afternoon and evening. However, as of Thursday, “there remains a fair amount of uncertainty regarding the snowfall amounts and the timing of the change in precipitation type,” the National Weather Service said.

AccuWeather’s snow accumulation predictions as of Thursday.

“Warm air and a delayed start to the storm will likely be a significant player and limit the duration of the snow and wintry mix period,” AccuWeather Senior Meteorologist Dave Dombek said in a news release. “In these marginal temperature areas, the snow has only a few hours or less to do the job.”

A week after days of spring-like weather, cold Canadian air will funnel to the “quick-hitting and rapidly-strengthening” system, AccuWeather said.

Those traveling around the mid-Atlantic area Saturday should expect conditions to deteriorate from west to east Saturday morning to afternoon.

Here is the storm timing, according to AccuWeather:

Despite a few threats of storms this season, the winter weather has been limited to mainly dustings of snow or a rain and snow mix. So far this winter, Philadelphia has experienced just 2 percent of its normal snowfall, according to AccuWeather.

“Much of the region, aside from the northern tier, simply hasn’t had much snow or ice so far this winter,” Dombek said in the release. “Still, enough snow and ice is likely to fall with this storm to create slippery travel from Washington, D.C., and Baltimore to New York City with a general coating to an inch or two forecast for these areas along Interstate 95.”

The weekend storm will usher in a change in the weather pattern: cold air is expected through the rest of the month, and into February.

Here is the forecast:

Tonight: Isolated snow showers before 8 p.m. Mostly cloudy, then gradually becoming mostly clear, with a low around 21. Blustery, with a northwest wind 17 to 21 mph, with gusts as high as 36 mph. Chance of precipitation is 20 percent.

Friday: Sunny, with a high near 31. Northwest wind 10 to 14 mph, with gusts as high as 29 mph.

Friday Night: Increasing clouds, with a low around 15. Northwest wind 5 to 7 mph becoming calm after midnight.

Saturday: Snow likely before 1 p.m., then snow, possibly mixed with sleet between 1 p.m. and 4 p.m., then rain and snow, possibly mixed with sleet after 4 p.m. High near 37. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 100 percent. New snow and sleet accumulation of 1 to 3 inches possible.

Saturday Night: Rain, possibly mixed with sleet before 10pm, then rain likely between 10 p.m. and 4 a.m., then a chance of rain and snow after 4am. Low around 31. Chance of precipitation is 90 percent. New precipitation amounts between a tenth and quarter of an inch possible.

Sunday: A chance of snow before 7 a.m. Mostly sunny, with a high near 37. Chance of precipitation is 30 percent.

Sunday Night: Partly cloudy, with a low around 20.

Monday: Mostly sunny, with a high near 31.

Monday Night: Partly cloudy, with a low around 17.

Tuesday: Mostly sunny, with a high near 30.

Tuesday Night: Partly cloudy, with a low around 14.

Wednesday: Mostly sunny, with a high near 32.

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