Synopsis: Currently a stationary front is draped across the commonwealth bringing stagnant clouds and humid conditions. A quite powerful cold front will sweep across Pennsylvania tomorrow, as a low pressure system marches northeast into eastern Canada. This will set the stage for generally a colder and snowier pattern, that has been the norm for the latter half of this month.
Short term: Currently flood watches are in effect across the southeast third of the state. The ground is already fairly saturated and with new rainfall amounts in excess of an inch expected over the course of tomorrow, local flooding may become an issue. Heaviest precipitation, however, may occur in the southwestern portions of the state, where thunderstorms may produce locally heavy rains. Thunderstorms are likely to be most severe in the southwest, where conditions will be most unstable. Although, a rumble of thunder can be expected across the commonwealth. After the cold front passes through, a strong northwesterly flow will set into place.
Long term: The lake effect machine will set up and produce accumulating snow across most of the northwestern portions of the state. This will linger into early this weekend. Colder conditions will stay in place through the weekend and into early next week. A weak clipper system will pass through early Friday dropping a few snow showers across the region. As of now, it appears the system should slide just south of the Mason-Dixon line, however; it should be monitored in the upcoming forecasts. Throughout the forecast period, weak continental systems will sweep by the Mid-Atlantic, as we are in a fairly progressive pattern.
Dakota
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