4:20 PM | ***Arctic air moves in overnight and temperatures will plunge; steadiest and heaviest snow is late tonight/early Monday***

Discussion

Precipitation will continue to be of the scattered variety over the next several hours as an initial area of moisture pushes through the Mid-Atlantic region. A second batch of moisture will push in from our southwest late tonight and it will produce steadier and heavier precipitation and that moisture will be coincide with the colder Arctic air moving in from our north. The axis of heaviest snow from this storm will occur in the area from the DC metro region to the central Delmarva Peninsula to the Jersey Shore where totals can reach 6-12”. Snowfall accumulations will drop off quickly to the north with areas like New York City likely ending up in the 2-4 inch zone and New England largely being spared from this storm.

Now for the specifics:

NYC: light snow or a light wintry mix this evening changes to all snow later tonight. The snow continues into the mid-to-late morning hours before winding down with total accumulations on the order of 2-4 inches. Temperatures drop sharply overnight to near 20 degrees by morning and hold relatively steady tomorrow in the upper teens to lower 20’s before plunging to single digits late tomorrow night.

PHL: rain or a light wintry mix at times through the evening hours and then steadier and heavier snow should fall from late tonight to the mid-to-late morning hours on Monday. Total accumulations are likely to end up in the 4-8 inch range in the Philly metro region with the 4 inches in the northern sections of the area (e.g. northern Bucks County) and the 8 inches in southern sections (e.g., southern Chester County). Temperatures drop sharply overnight to near 20 degrees by early morning and then hold relatively steady tomorrow in the upper teens to lower 20’s before plunging to near 0 degrees late tomorrow night.

DC to the Jersey Shore: rain falls early tonight and it should then change to a wintry mix after midnight and then to all snow by early tomorrow. Snow will continue for much of the day on Monday, heavy at times, and “thunder snow” cannot be ruled out. Total accumulations are likely to end up in the 6-12 inch range throughout this region from DC to the Jersey Shore. Temperatures drop sharply overnight to near 20 degrees by morning and hold relatively steady tomorrow in the upper teens to lower 20’s before plunging to single digits late tomorrow night.