Winter Storm Warning
URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
1251 AM MST Sat Dec 6 2025
WYZ012-024-062100-
/O.CON.KRIW.WS.W.0012.000000T0000Z-251206T2100Z/
Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges-
1251 AM MST Sat Dec 6 2025
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST THIS
AFTERNOON...
* WHAT...Heavy snow. Additional snow accumulations of 5 to 12
inches, with higher elevations seeing an additional 15 to 20
inches. Gusty winds of 30 to 45 mph will be common. Gusts of 60
mph are possible across the highest elevations.
* WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming
Ranges.
* WHEN...Until 2 PM MST this afternoon.
* IMPACTS...Travel could be very difficult, especially over Teton,
Togwotee, and Salt River Passes. The hazardous conditions could
impact travel through midday Saturday.
* ADDITIONAL DETAILS...Periods of moderate to heavy snow are
possible through Noon Saturday. Snow and gusty winds could cause
reduced visibilities and drifting snow.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.
For graphical depictions of the snowfall forecast, including the
official NWS forecast, high end amounts, and low end amounts, visit
https://weather.gov/riw/winter .
For winter road conditions from the Wyoming Department of
Transportation, visit https://wyoroad.info .
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
1251 AM MST Sat Dec 6 2025
WYZ008-070000-
/O.CON.KRIW.WS.W.0012.000000T0000Z-251207T0000Z/
Bighorn Mountains West-
1251 AM MST Sat Dec 6 2025
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS
AFTERNOON...
* WHAT...Snow expected. Additional snow accumulations of 8 to 15
inches over central and northern portions of the western Bighorn
Mountains, with higher elevations seeing up to 20 inches. Snow
accumulations of 1 to 8 inches across southern portions of the
Bighorns.
* WHERE...Bighorn Mountains West.
* WHEN...Until 5 PM MST this afternoon.
* IMPACTS...Travel could be very difficult over Granite and Powder
River Passes. The hazardous conditions could impact the travel on
Saturday morning.
* ADDITIONAL DETAILS...Heavy periods of snow are expected between
5AM and NOON Saturday when snowfall rates of 1 or more inches will
be possible.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.
For graphical depictions of the snowfall forecast, including the
official NWS forecast, high end amounts, and low end amounts, visit
https://weather.gov/riw/winter .
For winter road conditions from the Wyoming Department of
Transportation, visit https://wyoroad.info .
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
518 PM MST Fri Dec 5 2025
MTZ317-320-330-061315-
/O.CON.KTFX.WS.W.0019.000000T0000Z-251206T2100Z/
Little Belt and Highwood Mountains-Big Belt, Bridger and Castle
Mountains-Gallatin and Madison County Mountains and Centennial
Mountains-
Including the following locations: West Yellowstone, Trident,
Monarch, Battle Ridge Pass, Neihart, Bozeman Pass, Raynolds Pass,
Kings Hill Pass, Big Sky, Targhee Pass, Maudlow, and Deep Creek
Pass
518 PM MST Fri Dec 5 2025
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY...
* WHAT...Heavy snow. Additional snow accumulations between 4 and 11
inches. Isolated higher amounts. Winds gusting as high as 45 mph.
* WHERE...Big Belt, Bridger and Castle Mountains, Little Belt and
Highwood Mountains, and Gallatin and Madison County Mountains and
Centennial Mountains.
* WHEN...Until 2 PM MST Saturday.
* IMPACTS...Tire chains may be required for some vehicles if
traveling through mountain passes. Blowing snow could
significantly reduce visibility. Gusty winds could bring down tree
branches.
* ADDITIONAL DETAILS...Significant travel impacts to the Friday
evening commute are possible for Bozeman Pass and along Highway
191 south of Bozeman.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. The latest road conditions can
be obtained by calling 5 1 1 or visiting the MDT Road Report website.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
518 PM MST Fri Dec 5 2025
MTZ327-061315-
/O.CON.KTFX.WS.W.0019.000000T0000Z-251207T0000Z/
Northwest Beaverhead County-
Including the following locations: Wisdom, Wise River, Dewey,
Chief Joseph Pass, and Big Hole Pass
518 PM MST Fri Dec 5 2025
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST SATURDAY...
* WHAT...Heavy snow. Additional snow accumulations between 5 and 13
inches. Isolated higher amounts. Winds gusting as high as 50 mph.
* WHERE...Northwest Beaverhead County.
* WHEN...Until 5 PM MST Saturday.
* IMPACTS...Travel could be very difficult and tire chains may be
required for some vehicles. Those in the backcountry should ensure
they are prepared for dangerous conditions. Blowing snow could
significantly reduce visibility. Gusty winds could bring down tree
branches.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. The latest road conditions can
be obtained by calling 5 1 1 or visiting the MDT Road Report website.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
402 PM MST Fri Dec 5 2025
MTZ006-062315-
/O.CON.KMSO.WS.W.0012.000000T0000Z-251207T0000Z/
Bitterroot/Sapphire Mountains-
402 PM MST Fri Dec 5 2025
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST SATURDAY...
* WHAT...Heavy snow expected. There is a likelihood of major winter
storm impacts. Total snow accumulations 1 to 5 inches in the
valleys and 8 to 15 inches in the higher terrain including Lolo
and Lost Trail Passes. Winds gusting as high as 40 mph on Friday.
* WHERE...Lolo Pass and Highway 93 Sula to Lost Trail Pass.
* WHEN...Until 5 PM MST Saturday.
* IMPACTS...For MAJOR winter weather impacts, 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 Friday
evening commute, especially over higher passes. Gusty winds could
bring down tree branches.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
402 PM MST Fri Dec 5 2025
MTZ043-062315-
/O.CON.KMSO.WS.W.0012.000000T0000Z-251207T0000Z/
Potomac/Seeley Lake Region-
402 PM MST Fri Dec 5 2025
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST SATURDAY...
* WHAT...Heavy snow. There is a likelihood of developing or ongoing
major winter weather impacts to isolated extreme winter storm
impacts. Additional snow accumulations of 5 to 10 inches. Winds
gusting as high as 35 mph.
* WHERE...Highway 200 Bonner to Greenough, Highway 83 Seeley Lake to
Condon, and I-90 East Missoula to Bearmouth.
* WHEN...Until 5 PM MST Saturday.
* IMPACTS...For MAJOR winter weather impacts, expect considerable
disruptions to normal activities. Dangerous or impossible
traveling conditions. Avoid travel in the impacted areas if
possible. Widespread closures and disruptions to infrastructure
may occur. For EXTREME winter storm impacts, expect substantial
disruptions to normal activities. Extremely dangerous or
impossible traveling conditions. Travel in the impacted areas is
not advised. Extensive and widespread closures and disruptions to
infrastructure may occur. Life saving actions may be needed. The
hazardous conditions could impact the Friday evening commute,
especially over higher passes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
402 PM MST Fri Dec 5 2025
IDZ005-006-062315-
/O.CON.KMSO.WS.W.0012.000000T0000Z-251207T0000Z/
Northern Clearwater Mountains-Southern Clearwater Mountains-
302 PM PST Fri Dec 5 2025
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST SATURDAY...
* WHAT...Heavy snow. There is a likelihood of developing or ongoing
major winter weather impacts to isolated extreme winter storm
impacts. Additional snow accumulations up to 13 inches at higher
elevations including Lolo Pass and 1 to 5 inches at low
elevations. Winds gusting as high as 35 mph.
* WHERE...Dixie, Elk City, Highway 12 Lowell to Lolo Pass, Elk
River, Highway 11 Pierce to Headquarters, and Pierce.
* WHEN...Until 4 PM PST Saturday.
* IMPACTS...For MAJOR winter weather impacts, 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. For EXTREME winter storm impacts, expect substantial
disruptions to normal activities. Extremely dangerous or
impossible traveling conditions. Travel in the impacted areas is
not advised. Extensive and widespread closures and disruptions to
infrastructure may occur. Life saving actions may be needed. The
hazardous conditions could impact the Friday evening commute,
especially over higher passes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
402 PM MST Fri Dec 5 2025
MTZ004-062315-
/O.CON.KMSO.WS.W.0012.000000T0000Z-251207T0000Z/
Lower Clark Fork Region-
402 PM MST Fri Dec 5 2025
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST SATURDAY...
* WHAT...Heavy snow. There is a likelihood of developing or ongoing
major winter weather impacts to isolated extreme winter storm
impacts. Additional snow accumulations of 5 to 11 inches Taft to
Lookout Pass and 2 to 5 inches in the valleys. Winds gusting as
high as 35 mph.
* WHERE...Evaro Hill, Highway 200 Trout Creek to Heron, I-90 Lookout
Pass to Haugan, and Highway 200 Thompson Falls to Plains.
* WHEN...Until 5 PM MST Saturday.
* IMPACTS...For MAJOR winter weather impacts, expect considerable
disruptions to normal activities. Dangerous or impossible
traveling conditions. Avoid travel in the impacted areas if
possible. Widespread closures and disruptions to infrastructure
may occur. The hazardous conditions could impact the Friday
evening commute, especially over higher passes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Billings MT
229 PM MST Fri Dec 5 2025
MTZ067-068-062100-
/O.CON.KBYZ.WS.W.0017.000000T0000Z-251206T2100Z/
Absaroka/Beartooth Mountains-Crazy Mountains-
Including the locations of Cooke City
229 PM MST Fri Dec 5 2025
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY...
* WHAT...Periods of moderate to heavy snowfall, strong winds, and
blowing snow. Additional snow accumulations between 6 and 14
inches. Winds gusting as high as 75 mph.
* WHERE...Absaroka/Beartooth Mountains and Crazy Mountains.
* WHEN...Until 2 PM MST Saturday.
* IMPACTS...Mountain recreation will be impacted by heavy
accumulating snow and blowing snow. Whiteout conditions are
expected at times.
* ADDITIONAL DETAILS...The heaviest snowfall will occur on west and
northwest facing slopes. The mountains around Red Lodge and Nye
will see much less snowfall, 2 to 6 inches.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Those in the backcountry should ensure they are prepared for
dangerous winter conditions.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Pocatello ID
143 PM MST Fri Dec 5 2025
IDZ058>066-061200-
/O.CON.KPIH.WS.W.0008.000000T0000Z-251206T1200Z/
Marsh and Arbon Highlands-Franklin/Eastern Oneida Region-Bear
River Range-Bear Lake Valley-Blackfoot Mountains-Caribou Range-
Big Hole Mountains-Teton Valley-Centennial Mountains - Island
Park-
Including the cities of Malad, Thatcher, McCammon, Tetonia,
Inkom, Downey, Victor, Ashton, Montpelier, Lava Hot Springs,
Grace, Swan Valley, Emigration Summit, Georgetown, Island Park,
Driggs, Wayan, Bone, Soda Springs, Henry, St. Charles, Preston,
and Kilgore
143 PM MST Fri Dec 5 2025
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY...
* WHAT...Heavy snow generally above valley floors. Additional snow
accumulations of 6 to 10 inches above 6500 ft elevation. The Bear
River and Caribou Ranges could see additional accumulations of 12
to 18 inches. Very gusty winds overnight may cause areas of
blowing and drifting snowfall.
* WHERE...Big Hole Mountains, Centennial Mountains - Island Park,
Teton Valley, Bear Lake Valley, Bear River Range, Blackfoot
Mountains, Caribou Range, Franklin/Eastern Oneida Region, and
Marsh and Arbon Highlands.
* WHEN...Until 5 AM MST Saturday.
* IMPACTS...Travel could be very difficult to impossible. The
hazardous conditions could impact the Friday evening commute.
Gusty winds could bring down tree branches.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. Call 5 1 1 or visit
511.idaho.gov for the latest road conditions.
&&
$$
