Winter storm warning in effect for several counties across Pittsburgh area ahead of possible winter storm Monday
PITTSBURGH (KDKA) -- A winter storm warning is in effect for Greene, Fayette, Washington, Westmoreland, Somerset, Monongalia, Preston, and Garrett counties from 7 p.m. Sunday until 7 p.m. Monday.
A winter weather advisory is in effect for Allegheny and Indiana counties.
Those will likely stay as is this evening and not be expanded northward as the storm track has jogged a bit southward from previous model runs. Snow will begin before midnight for far Southwest Pennsylvania and northern West Virginia.
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The start time for snow in Pittsburgh will be around or just after midnight Monday and toward the predawn hours. For most, this will be an all-snow event. Mixed precipitation (sleet/freezing rain) may nudge into parts of Monongalia and Preston counties briefly during the early-mid morning hours of Monday if we get enough of a small surge of elevated warmer air from the south. Currently, it looks like warm air may stay in southern Monongalia County and areas into Central W. Va.
The band of heaviest snowfall will be very narrow and mainly along and south of I-68. This includes the Morgantown area over to Garrett County, Md., where six inches is likely, and more than nine inches of snow is possible.
Slightly lower totals but still several inches of snow are likely just north in Greene and Fayette counties, where six to nine inches of snow is likely. Washington, Southern Allegheny, and Westmoreland counties should expect three to six inches of snow, with a very sharp cutoff to only one to three inches possible from Pittsburgh north. Areas near I-80 will likely only see around one inch of snow from this system.
The snow should end by Monday evening from northwest to southeast, and then substantially colder air moves in for the middle to later portions of the week.
Another round of light snow showers will occur on Wednesday as a disturbance moves in from the northwest. As high pressure settles in, our coldest mornings are likely to be Thursday and Friday.
Slightly "less cold" air is expected to move in toward the end of the week and next weekend, but that may come with another chance of wintry precipitation.
Stay warm and safe and be extra careful driving tomorrow morning, especially south of Pittsburgh.
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