The National Weather Service says a snowstorm moving into western Colorado could leave Durango with 7 inches of snow on the ground by tonight or early Tuesday morning.
In addition, blowing snow is expected to be a problem in Durango beginning Tuesday night and continuing through Wednesday night, prime travel time for Thanksgiving Day.
In Silverton, the weather service expected 8 to 12 inches of accumulation Sunday night with up to an additional 9 inches during the day today and another 5 inches possible tonight. More snow could come Tuesday night, and problems with blowing snow also are expected tonight through Wednesday.
Thanksgiving is expected to be chilly, with Durangos high listed at 27 degrees and Silvertons at 10. Lows for Thanksgiving are expected to be 4 degrees in Durango and minus 3 in Silverton.
The Aspen area could be under up to 2 feet of snow, according to the weather service.
A winter storm warning is in effect for much of western Colorado until 6 a.m. Tuesday, and below-normal temperatures will turn frigid by Wednesday.
The weather service said the snow level would drop to the lower valleys by Sunday night. South-facing slopes will see the greatest accumulation.
The Colorado Avalanche Information Center has posted an avalanche watch for several mountain ranges, including the Elk Mountains surrounding Aspen.