Snow spread from Illinois and Wisconsin all the way to Massachusetts between yesterday an this morning. Meanwhile. Places from Washington, D.C., to near New York City stayed dry. It is pretty rare to see a snowstorm start in Boston without first affecting cities to the southwest. However, in this case, the moisture that will bring snow to the areas that missed it so far won't arrive from southwest until later this afternoon and this evening. Even then, we don't see a uniform shield of precipitation, so there will be areas that receive more or less than the forecast says. This is a draft version of our snowfall prediction map from early morning:
However, plan on slow travel in the I95 corridor from eastern Virginia on northeastward tonight. Accompanying the snow will be a frigid air mass straight from eastern Canada. This video has more.
Earlier this morning, the pressure pattern showed interesting features that could explain what was happening around the Northeast.
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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