Overnight lows dip into the 20s in the Philadelphia region and in the teens in the mountains with mostly clear skies. It'll be a sunny start to Sunday, before the clouds work back in for the afternoon. Expect highs to remain in the low 40s.

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High pressure slips in tonight with clearing skies, though some areas north and west pick up low clouds. Farther south and east, patchy fog has already begun to form and may turn into freezing fog toward daybreak, which could leave a light glaze on elevated surfaces.

CBS News Philadelphia

Sunday stays quiet with increasing clouds and highs ranging from the 30s northwest to low and mid 40s southeast.

A cold front moves through Sunday night and opens the door to a sharp blast of Arctic air. Monday brings the coldest stretch, with highs on

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