A rapidly moving low pressure spread snow all the way from D.C. to Boston this morning, and it will departs later this afternoon. Very cold air now over the area from central Canada through the Midwest will advance eastward to keep it very cold tomorrow through across the northeast quarter of the country. There are some weak short waves (upper air cold pockets that can help promote clouds and precipitation) embedded a strong stream of air that runs from northwest Canada to the northern Plains then eastward. Each one of these tends to increase cloudiness and patches of snow or flurries as it approaches each location, followed by some clearing after it leaves. One of these features is likely to bring 1-3 inches of powdery snow to the Chicago area in time for tomorrow's morning commute and could even set off a few flurries all the way to the I-95 corridor tomorrow night (just a chance this happens). Here is today's video.
At the end of the week, the high pressure area marking the center of the cold air mass will move off the Middle Atlantic coast and create a southerly flow of less cold air. Then, it appears a storm will form the Southeast and trek toward eastern New England this weekend. Current models suggest this will turn into a mostly rain event in the I-95 corridor, but that there may be a pretty large area of snow from the Appalachians through at least the eastern Great Lakes. We'll see how this plays out as the storm actually starts to take shape, but here is the GFS rendition for Sunday. Looking at the dashed lines, snow would be favored in the areas with blue lines and rain where there are red lines.
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The storm will not get organized until later Tuesday.
This storm is a little colder than the other two, so snow has dominated all the way to the coast