WEATHER & ROADS: Snowfall today and more freezing fog


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U.S. Highway 20 in Fremont County

IDAHO FALLS — The National Weather Service has issued a winter weather advisory in southern Montana and in Lemhi County for Wednesday, Dec. 13.

Officials say several inches of snow are expected, particularly in the mountain passes, until at least 2 p.m. The snow is expected to create slippery road conditions and reduce visibility.

Air stagnation remains an issue across Idaho and Utah and freezing fog is expected during the night in nearly all of eastern Idaho.

An air quality advisory remains in effect in Franklin County due to elevated pollutant levels in the air. A stable atmosphere with little wind is preventing pollutants from drifting outside the area. As a result, residential wood burning restrictions have been put in place inside the county until at least noon Thursday.

Individuals with inherent sensitivity to increased particulate levels are encouraged to avoid prolonged physical exertion outside. At these levels there is an increasing likelihood of respiratory symptoms and increased aggravation of asthma and/or lung ailments, according to NWS officials.

A heavy fog advisory is also in effect in central Idaho due to the stable atmosphere and little wind.

For more information please access the Idaho Department of Environmental Quality website at


Wednesday’s Forecast:

Idaho Falls, Rigby and Rexburg

There will be areas of freezing fog during the day and night with some snow showers possible. Highs of 26 to 34 degrees are expected with winds of 10 mph. During the night temperatures will drop to between 10 and 18 degrees with continued light winds.

Pocatello, Chubbuck and Blackfoot

It’ll be partly sunny today with areas of freezing fog in the morning and some isolated snow showers. Snow may continue into the afternoon with highs of 26 to 33 degrees and north winds of 10 mph. It’ll be cloudy at night with areas of freezing fog, lows of 10 to 18 degrees and continued light winds.

Dubois, St. Anthony, Ashton, Island Park, Driggs, and Victor

It’ll be partly sunny today with scattered snow showers in the morning, and numerous showers in the afternoon. Up to 2 inches of snow is possible. Highs of 28 to 35 degrees are expected. It’ll be cloudy tonight with a slight chance of snow and lows of 8 to 15 degrees.

Arco, Challis, and Mackay

It’ll be party sunny with scattered snow showers during the day. Highs of 32 to 42 degrees are expected. It’ll be mostly cloudy in the evening with lows of 11 to 20 degrees.

Henry, Soda Springs, Downey, and Lava Hot Springs

There will be snow in the area during the day with highs of 29 to 36 degrees. It’ll be cloudy at night with continued snow and freezing fog. Lows of 10 to 18 degrees are expected.

Road Report:

The following roads are listed as in fair condition due to icy patches or snow on the roadway:

  • U.S. Highway 20 between Ashton and the Montana border
  • Idaho Highway 87 between Henry’s Lake and the Montana border
  • Idaho Highway 29 between Leadore and the Montana border
  • Idaho Highway 28 between Leadore and Salmon
  • U.S. Highway 93 between Challis and the Montana border