Synopsis: A frontal boundary has pushed through the state and become stationary across northern Virginia, back through Kentucky and points westward. Waves of low pressure forming on the stationary front are moving northeast, bringing periods of rain to the commonwealth. It is also keeping temperatures cool across the state as it pulls in chilly Canadian air. The stationary front will persist through the weekend before finally moving south early in the week as a cold front approaches from the west.
Short term: The stationary boundary south of Pennsylvania will continue to bring periods of rain to the state. The next area of rain is currently in western Pennsylvania and will be moving east overnight. The rain should be steady at times with up to 0.5" of precipitation possible state wide. Expect the rain to push out early Friday with partial clearing Friday afternoon. As the sun heats up the surface Friday, it is possible that a few convective showers will form, especially in the southern portions of the state. With the unsettled weather both days expect temperatures to remain in the mid 60's across the state. The front will start to slowly slide south on Saturday leading to only a few isolated showers on Saturday, again mainly in southern portions of the state.
Long term: After a brief break from the widespread showers on Saturday, a low pressure system from Canada will begin making its way towards Pennsylvania. The low pressure will be weak, but will give the state yet another round of rain on Sunday. Expect rain to begin in the morning across western Pennsylvania and progress eastward as the day goes on with eastern regions seeing rain by late afternoon. Rainfall amounts should be light with 0.25-0.5" expected statewide. The rain will be out of the state by early Monday as high pressure pushes in behind the low pressure. High pressure will bring clear skies and warmer temperatures in the lower 70's to Pennsylvania for at least the first half of next week.
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