As moisture races into the region tonight into tomorrow morning, freezing rain and sleet will develop for interior locations like the Poconos, Catskills, Hudson Highlands, Hudson River Valley, and much of Connecticut. Very little if any snowfall is expected in this part of the storm. Surface temperatures in these locations will be in the upper 20s to lower 30s which will support a period through 10 AM tomorrow morning for ice accretion on roadways, trees, and powerlines. The rest of the region will have temperatures in the mid-30s to lower 40s with periods of rain, heavy at times.
Waves of moderate to heavy rainfall will continue tomorrow afternoon on through Friday morning for the entire region. The heaviest rainfall will be found in the Philadelphia and New York City metropolitan areas and coastal locations with 1″ to 3″ of rain expected. Flash flooding and urban flooding will be a threat throughout the region, but especially along the coast.
By Friday afternoon, the low-pressure system will start to lift into New England with rain tapering off. The precipitation for the interior will change over to snow before ending and will be briefly heavy. Friday afternoon will feature the bulk of the snow accumulation for the Poconos and Catskills. Winds will back to the west at 10 to 20 mph with gusts over 30 mph at times throughout the region.
Dry conditions will return for Friday evening on through Saturday. A weak low-pressure system will follow on Sunday with a few rain and snow showers but no snow accumulation is expected.