A quick-hitting winter system will bring snow to northern Pennsylvania and a wintry mix to the south tonight through Sunday, with some locations perhaps witnessing freezing drizzle. A stronger winter storm is forecast to hit the region on Tuesday, potentially causing widespread snowfall.
Around midnight, snow will begin to fall in northwestern Pennsylvania, with Warren County and adjacent areas seeing the most accumulations. The Laurel Highlands is under a winter weather advisory from 3 a.m. to noon Sunday due to the potential of freezing drizzle, which could cause slippery road conditions, especially at higher elevations.
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As the system goes through Sunday, some places may get snow squalls along the cold front, particularly in the Alleghenies, where instability will develop. Southern portions will most likely change to a rain-snow mix, with temperatures in the 40s south of Interstate 80 and below 1,500 feet elevation. The front will pass through Bradford around 1 p.m. and reach Lancaster by 7 p.m., bringing strong winds with it.
Brief lake-effect snow may affect far northwestern Pennsylvania. Sunday night and early Monday, a northwest flow develops behind the cold front. Monday should be generally clear as high pressure builds in, but clouds will appear later in the day.
The week’s main weather event is scheduled to occur on Tuesday, when a coastal storm brings extensive snow to the region. While confidence in exact time and amounts remains moderate, experts predict a “plowable snowfall” for most places. The Winter Storm Outlook predicts 30-to-50 percent warning threshold snowfall (5+ inches) in northern Pennsylvania, with slightly lower quantities likely in northwest areas.
Temperatures will remain below normal until early December, with lows perhaps plunging into the teens or single digits later in the week as the active storm pattern lingers.
