ECMWF precip type map valid for Saturday afternoon. (wx.graphics)

First Accumulating Snow of the Season Becoming Likely for the East Coast

Good afternoon! In the world of weather, there has been a lot of model mayhem regarding a big shift in the data further northwest with a coastal storm, which is leading to the idea of accumulating snow across much of the Eastern US on Saturday. We believe that these ideas have a lot of merit, and in this article we are going to explain why, as well as overview some of our expectations.

In the macro sense, it’s not a complicated setup. We have a large ridge in the West, and a corresponding deep trough in the East, we have disturbances sliding down the ridge and entering the trough, and we also have a relatively stalled frontal boundary off the coast, providing a strong temperature gradient for a storm to ride, while also providing enough ridging in the Atlantic to keep the storm from sliding out to sea.

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