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 the Valentine's Day weekend.
A storm unleashing snow from the mid-Atlantic to the Northeast on Tuesday will slow travel and cause delays.
Episodes of snow and slippery travel will affect the mid-Atlantic states and parts of New England through Thursday.
Waves of arctic air invading the eastern half of the United States this week will culminate with the coldest weather of the season so far for some areas by the Valentine's Day weekend.
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