A very warm air mass will remain over the Philadelphia and New York City metropolitan areas through Wednesday afternoon.
A cold front will approach from the west but will collapse before reaching the New York City and Philadelphia metropolitan areas. The fog over the region will lift by 10 AM giving way to scattered cloud cover and winds from the west at 5 mph. Temperatures will rise into the mid to upper 50's over the interior and lower to mid 60's along the coast.
The unseasonably warm conditions will continue tonight on through tomorrow with scattered cloud cover and winds from the southwest at 5 to 10 mph. Fog will redevelop in some locations in the morning hours with visibility falling below 2 miles at times. Temperatures will range from the mid 40's to lower 50's for lows and upper 50's to mid 60's for highs.
A much stronger cold front will move through the region on Wednesday with scattered showers in the morning followed by clearing skies in the afternoon. As winds shift to the northwest at 5 to 15 mph, temperatures will fall through the afternoon hours. Temperatures will range from the upper 40's to lower 50's in the morning and rebound into the upper 50's to lower 60's for early afternoon highs. Temperatures will fall through the 40's in the afternoon.
High pressure will produce chilly yet dry conditions on Thursday. Temperatures will return to near normal levels with lows in the upper 20's to lower 30's and highs in the lower to mid 40's. The high pressure system will shift off the coast on Friday and Saturday with scattered cloud cover and near normal temperatures. Temperatures will range from the mid to upper 30's for lows and mid 40's to lower 50's for highs.
A warm front will move through the region on Sunday with scattered showers and warmer temperatures. Temperatures will range from the upper 30's to lower 40's for lows and lower to mid 50's for highs.