Synopsis
Currently, the high pressure system will move off the coast tonight and make way for a cold front located over the Great lakes. As this cold front associated with upper-level trough approaches the area on Friday, there will be the chance for lake-effect snow showers in northwest PA. Behind this front, another area of high pressure will move into area on Saturday. This area of high pressure will dominate the area and provide nice weather through early next week.
Short Term
Clouds have rolled in during the evening and have to put an end to temperatures falling much tonight into Friday morning. As this upper-level trough moves through on Friday, a cold front will pass by and skies will remain partly cloudy. Westerly flow will allow for lake-effect snow bands to set up near Erie and other areas in northwestern PA Friday afternoon into the evening. Once this trough progresses by, 850 mb temperatures will fall to -12 to -14 C. This will result in daytime highs being below normal on Saturday. As high pressure builds in Saturday evening, temperatures will plummet with clear skies and calm winds.
Long Term
This area of high pressure will dominate the weather from Sunday through Tuesday. Daytime highs will be near normal and lows around average due to prime radiating conditions at night. Late in the period, a cold front is possible on Wednesday as an area of low pressure moves through southern Canada.
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