Surface plot and visible satellite image
Notes:
A closer look at the surface pattern on the 22nd indicates that a cool marine air mass covered New England, while a cold front was advancing eastward from the eastern Great Lakes area. Central and eastern New York and eastern Pennsylvania was in a narrow warm sector between the marine air mass and the cold front. Clearing occurred in the warm sector during the morning, and convection developed along the cold front during the afternoon as it reached central and eastern New York and eastern Pennsylvania.
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Slide 5