By Alex Sosnowski – AccuWeather
The coldest air of the winter will plunge southward across much of the eastern United States and will feature single-digit and sub-zero temperatures in the Northeast during Valentine’s Day weekend.
The polar vortex will send a dose of frigid air southward beyond the borders of Canada. Some of the air will slide directly southward from eastern Canada and avoid any warming effects of the milder waters of the Great Lakes. Instead cold and lake effect snow will head to the Snow Belt.
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