Synopsis:
In the wake of the cold front, the associated low pressure system will move off the coast and provide a northwesterly flow off the great lakes. This will set up a lake effect snow event for northwestern counties and the Laurel Highlands through Friday. High pressure will approach the region Saturday and the northwesterly flow will weaken. However, a second low pressure system will pass to the north of the state, providing a chance for more lake effect snow showers for the northern portions of the state for the end of the weekend due to a mean westerly wind off the lakes. High pressure and a more zonal flow will dominate for the beginning of the work week.
Short Term: (Tuesday night through Wednesday night)
Cold air advection will continue to drop temperatures across the state for the majority of the week. Much of the state is expected to have low temperatures in the mid to upper 30's Tuesday night with high temperatures on Wednesday only reaching the mid to upper 40's with a few low 50's in southeastern counties according to the 18Z 12km NAM. The northwesterly flow will also provide northwestern PA and the Laurel Highlands with a chance for lake effect snow showers Tuesday night through Wednesday night. The 20Z HRRR is showing some rain showers in the southeastern portions of the state Tuesday night and into Wednesday morning.
Long Term: (Thursday into the weekend)
The northwesterly flow and the associated lake effect snow will persist through Friday. Overnight Friday, high pressure will begin to approach the state and the northwesterly flow will weaken. A low pressure system to the north will approach the region but remain north and the associated cold front will prove a mean westerly flow off the lakes. This will lead to a chance for lake effect snow for northern counties. High pressure will move into the region Sunday night and lead to a drier start to the workweek.
~ A.J. Herbert
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