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Freezing rain and sleet enveloped parts of the Northeast on Sunday, giving way to snow in some areas as the day progressed.
The Portland, Maine, office predicted up to seven inches of snow in that area. A storm warning is in effect there until 7 a.m. Monday.
On the West Coast, a winter storm may affect holiday travel with heavy snow possible over the Sierra, the NWS said.
Lots of rainfall is possible for Southern California beginning Tuesday.
Snow to wallop Midwest
A front will move east from the Pacific to the Northern Plains over the weekend, the weather service said. By Monday, the front will be in the Upper Great Lakes and all over the Midwest.
Snowfall is expected Tuesday from the Central Plains to the Upper Great Lakes. Snow is also possible Wednesday in the Southern High Plains and Thursday in North Central US.
Chicago will start with rain Tuesday afternoon, then turn to snow late Tuesday. The snow should be out of Chicago by Wednesday morning.
Parts of Wisconsin and Michigan will get a round of heavy snow on Tuesday and early Wednesday before clearing out.
Behind the system, temperatures will drop 5 to 15 degrees. Much of the Midwest will have highs in the upper 30s to low 40s for Thanksgiving Day, with dry conditions.
Busiest travel season
All the threats of terrible weather will be mixed with an increase in travel.
Wednesday is expected to have the most traffic congestion. Atlanta, Los Angeles, New York, Boston, Houston and San Francisco could see more than three times their norms.
CNN’s Theresa Waldrop contributed to this report.
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