Jefferson County, MT Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Jefferson County.

Use the Radar Maps link provided to understand the trajectory of a storm.

Special Weather Statement issued November 20 at 5:33AM MST by NWS Great Falls MT

Patchy dense fog has developed this morning. The fog was affecting areas around Great Falls, Power, Fort Benton and Havre. Visibility will be reduced to a quarter of a mile at times. The fog should begin to dissipate by late morning. As of reminder, if driving and visibility is poor, reduce your driving speeds.

Winter Weather Advisory issued November 20 at 2:51AM MST until November 21 at 11:00AM MST by NWS Great Falls MT

* WHAT...Snow expected. Total snow accumulations between 2 to 4 inches on Marias Pass, with up to 8 inches at ridgetops. * WHERE...East Glacier Park Region Zone. * WHEN...From 11 AM this morning to 11 AM MST Thursday. * IMPACTS...Travel could be difficult. * ADDITIONAL DETAILS...Additional snow accumulations are likely Friday and Saturday.

High Wind Warning issued November 20 at 2:36AM MST until November 20 at 3:00PM MST by NWS Billings MT

* WHAT...Northwest winds 30 to 40 mph with gusts up to 60 mph. * WHERE...Carter and Fallon. * WHEN...Until 3 PM MST this afternoon. * IMPACTS...Patchy blowing snow will reduce the visibility at times. * ADDITIONAL DETAILS...The strongest winds will occur this morning.

Winter Weather Advisory issued November 20 at 1:46AM MST until November 20 at 11:00AM MST by NWS Glasgow MT

* WHAT...Winds gusting as high as 45 mph resulting in blowing snow. * WHERE...Eastern Roosevelt and Richland Counties. * WHEN...Until 11 AM MST this morning. * IMPACTS...The hazardous conditions could impact the morning commute. Gusty winds could bring down tree branches.

Blizzard Warning issued November 20 at 1:46AM MST until November 20 at 11:00AM MST by NWS Glasgow MT

* WHAT...Blizzard conditions. Winds gusting as high as 50 mph. * WHERE...Sheridan County. * WHEN...Until 11 AM MST this morning. * IMPACTS...Visibilities may drop below 1/4 mile due to blowing snow. Whiteout conditions are expected and will make travel treacherous and potentially life-threatening. The hazardous conditions could impact the morning commute. Gusty winds could bring down tree branches.

Winter Weather Advisory issued November 20 at 1:46AM MST until November 20 at 11:00AM MST by NWS Glasgow MT

* WHAT...Winds gusting as high as 45 mph resulting in blowing snow. * WHERE...Daniels, Dawson, Western Roosevelt, and Wibaux Counties. * WHEN...Until 11 AM MST this morning. * IMPACTS...The hazardous conditions could impact the morning commute. Gusty winds could bring down tree branches.

Lake Wind Advisory issued November 19 at 2:06PM MST until November 20 at 11:00AM MST by NWS Glasgow MT

* WHAT...Northwest winds 25 to 35 mph with gusts up to 50 mph. Wind speeds will gradually diminish on Wednesday from west to east. * WHERE...Central and Southeast Phillips, Central and Southern Valley, Garfield, McCone, and Petroleum Counties. * WHEN...Until 11 AM MST Wednesday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft.

Winter Weather Advisory issued November 19 at 11:43AM MST until November 20 at 11:00AM MST by NWS Missoula MT

* WHAT...Snow expected. Likelihood of moderate impacts from 3 to 6 inches of snow is greater than 90 percent, and up to a 50 percent chance of isolated major impacts from 6 to 10 inches or more of snow. * WHERE...Highway 93 Sula to Lost Trail Pass and Lolo Pass. * WHEN...From 5 AM to 11 AM MST Wednesday. * IMPACTS...For MODERATE impacts from snow, expect disruptions to normal activities. Hazardous traveling conditions. Use extra caution while driving. Closures and disruptions to infrastructure may occur. For MAJOR impacts from snow, expect considerable disruptions to normal activities. Dangerous or impossible traveling conditions. Avoid travel in the impacted areas if possible. Widespread closures and disruptions to infrastructure may occur. The hazardous conditions could impact the Wednesday morning commute, especially over higher passes.

Winter Weather Advisory issued November 19 at 11:43AM MST until November 20 at 11:00AM MST by NWS Missoula MT

* WHAT...Snow expected. Valley accumulations of 1 to 3 inches. Likelihood of moderate impacts in the higher terrain from 3 to 6 inches of snow is greater than 90 percent, and up to a 50 percent chance of isolated major impacts from 6 to 10 inches or more of snow. * WHERE...Highway 2 Kalispell to Libby, Highway 37 Eureka to Libby, Highway 93 Eureka to Whitefish, and Highway 56 Bull Lake Road. * WHEN...From 5 AM to 11 AM MST Wednesday. * IMPACTS...For MODERATE impacts from snow, expect disruptions to normal activities. Hazardous traveling conditions. Use extra caution while driving. Closures and disruptions to infrastructure may occur. For MAJOR impacts from snow, expect considerable disruptions to normal activities. Dangerous or impossible traveling conditions. Avoid travel in the impacted areas if possible. Widespread closures and disruptions to infrastructure may occur. The hazardous conditions could impact the Wednesday morning commute, especially over higher passes.

Winter Weather Advisory issued November 19 at 11:43AM MST until November 21 at 11:00AM MST by NWS Missoula MT

* WHAT...Snow expected. Valley accumulations of 1 to 3 inches. Likelihood of moderate impacts in the higher terrain and mountain passes from 3 to 6 inches of snow is greater than 90 percent, and up to a 50 percent chance of isolated major impacts from 6 to 10 inches or more of snow. * WHERE...Marias Pass, Essex, Bad Rock Canyon, Polebridge, and Highway 83 Bigfork to Swan Lake. * WHEN...From 11 AM Wednesday to 11 AM MST Thursday. * IMPACTS...For MODERATE impacts from snow, expect disruptions to normal activities. Hazardous traveling conditions. Use extra caution while driving. Closures and disruptions to infrastructure may occur. For MAJOR impacts from snow, expect considerable disruptions to normal activities. Dangerous or impossible traveling conditions. Avoid travel in the impacted areas if possible. Widespread closures and disruptions to infrastructure may occur. The hazardous conditions could impact the Wednesday evening and Thursday morning commutes, especially over higher passes.

Winter Weather Advisory issued November 19 at 11:43AM MST until November 21 at 11:00AM MST by NWS Missoula MT

* WHAT...Snow expected. Valley accumulations of 1 to 3 inches. Likelihood of moderate impacts in the higher terrain and mountain passes from 3 to 6 inches of snow is greater than 90 percent, and up to a 50 percent chance of isolated major impacts from 6 to 10 inches or more of snow. * WHERE...Evaro Hill, I-90 Lookout Pass to Haugan, Highway 200 Thompson Falls to Plains, and Highway 200 Trout Creek to Heron. * WHEN...From 5 AM Wednesday to 11 AM MST Thursday. * IMPACTS...For MODERATE impacts from snow, expect disruptions to normal activities. Hazardous traveling conditions. Use extra caution while driving. Closures and disruptions to infrastructure may occur. For MAJOR impacts from snow, expect considerable disruptions to normal activities. Dangerous or impossible traveling conditions. Avoid travel in the impacted areas if possible. Widespread closures and disruptions to infrastructure may occur. The hazardous conditions could impact the Wednesday morning and evening commutes, especially over higher passes.