ORIGINAL MORNING POST:
A weak low pressure area from western Virginia will move to the New England coast by late tonight. As of 10:30 this morning, radar showed patches of snow from northern Virginia to southeastern Pennsylvania and southern New Jersey, much of it not reaching the ground. This morning's NMM-WRF model showed an upward motion max over Washington DC at 1 PM and over Philadelphia at 4 PM. On the accompanying video, I show you what this looks like. So what? The airmass in place from Virginia to Southern New England is fairly moist. If this air is forced to rise, it cools to the saturation point and soon some precipitation breaks out. We're not talking about a long period here, or any excessive amounts, but I wouldn't be surprised if we see a few bands of snow that can deliver an inch or 2 in a couple of hours. Of course, the banded structure means places between the bands will get little or nothing.
UPDATE: the bands of snow dropped 1-2 inches on some of Philadelphia's northern and western suburbs in the middle of the afternoon, but that snow retreating to the northeast (actually, the snow is not retreating, but is rather sitting on the ground where it fell. The area where snow is coming out of the clouds is moving northeast). Between 4 and 6 PM the heavier snow moved through sections of northern New Jersey and through New York City.
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