BISMARCK, N.D. (AP) — Bad weather could snarl Thanksgiving travel plans for residents of the Dakotas.

The National Weather Service says parts of the two states could get up to 4 inches of snow from a clipper system sweeping in from the west.

The agency posted a winter weather advisory for most of North Dakota into Tuesday night, and for northeastern South Dakota into Wednesday morning. Forecasters said travelers should prepare for snow-packed and icy roads.

The good news for travelers is that gasoline is a lot cheaper than it was a year ago at this time.

GasBuddy.com reports the average retail gas price in North Dakota is about $2.95 a gallon, more than 22 cents lower than last year. In South Dakota it's $2.83 per gallon — more than 31 cents lower.

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