Winter Storm Warning
URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
146 PM MST Thu Dec 4 2025
...SERIES OF WINTER STORMS TO AFFECT THE MOUNTAINS AND PASSES
THROUGH THE SATURDAY...
.The first round of heavy snow is expected to last through early
Friday morning and will primarily focus on the mountains of central
and southwest Montana with 4 to 8 inches possible along the mountain
passes including Bozeman and Kings Hill Pass. A period of lighter
snowfall is expected Friday morning and afternoon. The second and
more widespread round of heavier snowfall is expected to arrive
Friday evening and continue into Saturday evening with an additional
6 to 12 inches possible over the passes and higher amounts above
pass level.
MTZ317-320-330-051200-
/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: Maudlow, Big Sky, West
Yellowstone, Kings Hill Pass, Trident, Monarch, Targhee Pass,
Neihart, Deep Creek Pass, Bozeman Pass, Battle Ridge Pass, and
Raynolds Pass
146 PM MST Thu Dec 4 2025
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY...
* WHAT...Heavy snow expected. Snowfall totals between 8 and 12
inches at pass level and up to 24 inches above pass level. 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...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.
* ADDITIONAL DETAILS...Significant travel impacts to the Thursday
and Friday commutes 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.
Remember, a Winter Storm Warning means that there is at least an 80%
chance of impactful winter weather conditions during the warning
period.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
146 PM MST Thu Dec 4 2025
...SERIES OF WINTER STORMS TO AFFECT THE MOUNTAINS AND PASSES
THROUGH THE SATURDAY...
.The first round of heavy snow is expected to last through early
Friday morning and will primarily focus on the mountains of central
and southwest Montana with 4 to 8 inches possible along the mountain
passes including Bozeman and Kings Hill Pass. A period of lighter
snowfall is expected Friday morning and afternoon. The second and
more widespread round of heavier snowfall is expected to arrive
Friday evening and continue into Saturday evening with an additional
6 to 12 inches possible over the passes and higher amounts above
pass level.
MTZ327-051200-
/O.UPG.KTFX.WS.A.0018.251205T1200Z-251207T0000Z/
/O.EXB.KTFX.WS.W.0019.251205T0000Z-251207T0000Z/
Northwest Beaverhead County-
Including the following locations: Dewey, Chief Joseph Pass, Big
Hole Pass, Wisdom, and Wise River
146 PM MST Thu Dec 4 2025
...WINTER STORM WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 PM
MST SATURDAY...
* WHAT...Heavy snow expected. Snowfall totals between 2 and 6 inches
in the Big Hole Valley and between 8 and 15 inches at pass level.
Winds gusting as high as 40 mph.
* WHERE...Northwest Beaverhead County.
* WHEN...From 5 PM this afternoon to 5 PM MST Saturday.
* IMPACTS...Travel could be very difficult and tire chains may be
required for some vehicles. Those in the backcountry should ensure
they are prepared for dangerous conditions. Gusty winds could
bring down tree branches.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. The latest road conditions can
be obtained by calling 5 1 1 or visiting the MDT Road Report website.
Remember, a Winter Storm Warning means that there is at least an 80%
chance of impactful winter weather conditions during the warning
period.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
102 PM MST Thu Dec 4 2025
...PROLONGED SNOW EVENT...
.A plume of snow will continue to impacted north central Idaho into
west central and southwest Montana tonight. The snow activity will
decrease in intensity during the day on Friday, then a second plume
of precipitation will impact the region late Friday through Saturday.
IDZ005-006-052015-
/O.UPG.KMSO.WS.A.0010.251205T1200Z-251207T0000Z/
/O.NEW.KMSO.WS.W.0012.251205T0000Z-251207T0000Z/
Northern Clearwater Mountains-Southern Clearwater Mountains-
1202 PM PST Thu Dec 4 2025
...WINTER STORM WARNING IN EFFECT FROM 4 PM THIS AFTERNOON TO 4 PM
PST SATURDAY...
* WHAT...Heavy snow expected. There is a likelihood of major winter
storm impacts. Total snow accumulations 2 to 6 inches in the
valleys and 9 to 18 inches in the higher terrain including Lolo
Pass.
* WHERE...Highway 11 Pierce to Headquarters, Highway 12 Lowell to
Lolo Pass, Elk River, Elk City, Pierce, and Dixie.
* WHEN...From 4 PM this afternoon to 4 PM PST Saturday.
* IMPACTS...Travel could be very difficult to impossible. The
hazardous conditions could impact the Thursday evening and Friday
morning commutes, 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.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
102 PM MST Thu Dec 4 2025
...PROLONGED SNOW EVENT...
.A plume of snow will continue to impacted north central Idaho into
west central and southwest Montana tonight. The snow activity will
decrease in intensity during the day on Friday, then a second plume
of precipitation will impact the region late Friday through Saturday.
MTZ004-052015-
/O.UPG.KMSO.WS.A.0010.251205T1200Z-251207T0000Z/
/O.NEW.KMSO.WS.W.0012.251205T0000Z-251207T0000Z/
Lower Clark Fork Region-
102 PM MST Thu Dec 4 2025
...WINTER STORM WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 PM
MST SATURDAY...
* WHAT...Heavy snow expected. There is a likelihood of major winter
weather impacts. Total snow accumulations of 1 to 4 inches in the
valleys and 8 to 14 inches in the higher terrain including Lookout
Pass and Evaro Hill.
* WHERE...I-90 Lookout Pass to Haugan, Highway 200 Thompson Falls to
Plains, Highway 200 Trout Creek to Heron, and Evaro Hill.
* WHEN...From 5 PM this afternoon to 5 PM MST Saturday.
* IMPACTS...Travel could be very difficult. The hazardous conditions
could impact the Thursday evening and Friday morning commutes,
especially over higher passes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
102 PM MST Thu Dec 4 2025
...PROLONGED SNOW EVENT...
.A plume of snow will continue to impacted north central Idaho into
west central and southwest Montana tonight. The snow activity will
decrease in intensity during the day on Friday, then a second plume
of precipitation will impact the region late Friday through Saturday.
MTZ006-052015-
/O.UPG.KMSO.WS.A.0010.251205T1200Z-251207T0000Z/
/O.NEW.KMSO.WS.W.0012.251205T0000Z-251207T0000Z/
Bitterroot/Sapphire Mountains-
102 PM MST Thu Dec 4 2025
...WINTER STORM WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 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...Highway 93 Sula to Lost Trail Pass and Lolo Pass.
* WHEN...From 5 PM this afternoon to 5 PM MST Saturday.
* IMPACTS...Travel could be very difficult to impossible. The
hazardous conditions could impact the Thursday evening and Friday
morning commutes, 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.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
102 PM MST Thu Dec 4 2025
...PROLONGED SNOW EVENT...
.A plume of snow will continue to impacted north central Idaho into
west central and southwest Montana tonight. The snow activity will
decrease in intensity during the day on Friday, then a second plume
of precipitation will impact the region late Friday through Saturday.
MTZ043-052015-
/O.UPG.KMSO.WS.A.0010.251205T1200Z-251207T0000Z/
/O.NEW.KMSO.WS.W.0012.251205T0000Z-251207T0000Z/
Potomac/Seeley Lake Region-
102 PM MST Thu Dec 4 2025
...WINTER STORM WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 PM
MST SATURDAY...
* WHAT...Heavy Snow expected. There is a likelihood of major winter
weather impacts. Total snow accumulations between 5 to 10 inches.
* WHERE...Highway 83 Seeley Lake to Condon, I-90 East Missoula to
Bearmouth, and Highway 200 Bonner to Greenough.
* WHEN...From 5 PM this afternoon to 5 PM MST Saturday.
* IMPACTS...Travel could be very difficult to impossible. The
hazardous conditions could impact the Thursday evening and Friday
morning commutes, especially over higher passes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Billings MT
1256 PM MST Thu Dec 4 2025
MTZ067-068-052000-
/O.CON.KBYZ.WS.W.0017.251204T2100Z-251206T2100Z/
Absaroka/Beartooth Mountains-Crazy Mountains-
Including the locations of Cooke City
1256 PM MST Thu Dec 4 2025
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY...
* WHAT...Periods of moderate to heavy snow expected. Total snow
accumulations between 12 and 24 inches, greatest on west facing
slopes where locally higher amounts are possible. Winds gusting as
high as 45 mph.
* WHERE...Absaroka/Beartooth Mountains and Crazy Mountains.
* WHEN...Until 2 PM MST Saturday.
* IMPACTS...Recreation in the backcountry will be impacted by heavy
accumulating snow and blowing snow. Localized whiteout conditions
are possible.
* ADDITIONAL DETAILS...Snowfall amounts on the northeast facing
slopes around Nye to Red Lodge are much less, around 3 to 6 inches.
A temporary break in the snowfall is expected Friday.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Those in the backcountry should ensure they are prepared for
dangerous winter conditions.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Pocatello ID
1253 PM MST Thu Dec 4 2025
IDZ058>066-051130-
/O.UPG.KPIH.WS.A.0006.251205T0000Z-251206T1200Z/
/O.NEW.KPIH.WS.W.0008.251205T0000Z-251206T1200Z/
Marsh and Arbon Highlands-Franklin/Eastern Oneida Region-Bear
River Range-Bear Lake Valley-Blackfoot Mountains-Caribou Range-
Big Hole Mountains-Teton Valley-Centennial Mountains - Island
Park-
Including the cities of Kilgore, Island Park, Swan Valley,
Tetonia, Ashton, Inkom, Driggs, Henry, McCammon, Preston, Downey,
Georgetown, Bone, Malad, Emigration Summit, St. Charles, Soda
Springs, Montpelier, Lava Hot Springs, Wayan, Thatcher, Victor,
and Grace
1253 PM MST Thu Dec 4 2025
...WINTER STORM WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 AM
MST SATURDAY...
* WHAT...Heavy snow expected at times. Total snow accumulations
through Friday night between 3 and 6 inches in the valleys and 10
to 18 inches in the mountains. A few locations above 8000 ft could
see higher amounts with snow rates approaching an inch per hour at
times. Very gusty winds developing late Friday into Friday night.
* WHERE...Big Hole Mountains, Centennial Mountains - Island Park,
Teton Valley, Bear Lake Valley, Bear River Range, Blackfoot
Mountains, Caribou Range, Franklin/Eastern Oneida Region, and
Marsh and Arbon Highlands.
* WHEN...From 5 PM this afternoon to 5 AM MST Saturday.
* IMPACTS...Travel could be very difficult to impossible. The
hazardous conditions could impact the Friday morning commute.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. Call 5 1 1 or visit
511.idaho.gov for the latest road conditions.
&&
$$
Visit weather.gov/pocatello for more information.
DMH
Winter Weather Advisory
URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
146 PM MST Thu Dec 4 2025
...SERIES OF WINTER STORMS TO AFFECT THE MOUNTAINS AND PASSES
THROUGH THE SATURDAY...
.The first round of heavy snow is expected to last through early
Friday morning and will primarily focus on the mountains of central
and southwest Montana with 4 to 8 inches possible along the mountain
passes including Bozeman and Kings Hill Pass. A period of lighter
snowfall is expected Friday morning and afternoon. The second and
more widespread round of heavier snowfall is expected to arrive
Friday evening and continue into Saturday evening with an additional
6 to 12 inches possible over the passes and higher amounts above
pass level.
MTZ322-051200-
/O.NEW.KTFX.WW.Y.0052.251205T0000Z-251205T1800Z/
Elkhorn and Boulder Mountains-
Including the following locations: Clancy, Elk Park Pass,
Boulder, Homestake Pass, Wickes, Corbin, and Montana City
146 PM MST Thu Dec 4 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO 11
AM MST FRIDAY...
* WHAT...Snow expected. Total snow accumulations between 2 and 6
inches.
* WHERE...Elkhorn and Boulder Mountains.
* WHEN...From 5 PM this afternoon to 11 AM MST Friday.
* IMPACTS...Plan on slippery road conditions. The hazardous
conditions could impact the Thursday evening and Friday morning
commutes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling. The latest road
conditions can be obtained by calling 5 1 1 or visiting the MDT Road
Report website.
Remember, a Winter Weather Advisory means that there is at least an
80% chance of minor impacts due to winter weather conditions during
the advisory period.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
146 PM MST Thu Dec 4 2025
...SERIES OF WINTER STORMS TO AFFECT THE MOUNTAINS AND PASSES
THROUGH THE SATURDAY...
.The first round of heavy snow is expected to last through early
Friday morning and will primarily focus on the mountains of central
and southwest Montana with 4 to 8 inches possible along the mountain
passes including Bozeman and Kings Hill Pass. A period of lighter
snowfall is expected Friday morning and afternoon. The second and
more widespread round of heavier snowfall is expected to arrive
Friday evening and continue into Saturday evening with an additional
6 to 12 inches possible over the passes and higher amounts above
pass level.
MTZ326-051200-
/O.NEW.KTFX.WW.Y.0052.251204T2300Z-251205T1800Z/
Gallatin Valley-
Including the following locations: Bozeman and Gallatin Gateway
146 PM MST Thu Dec 4 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO 11
AM MST FRIDAY...
* WHAT...Snow expected. Total snow accumulations between 2 and 4
inches.
* WHERE...Gallatin Valley.
* WHEN...From 4 PM this afternoon to 11 AM MST Friday.
* IMPACTS...Plan on slippery road conditions. The hazardous
conditions could impact the Thursday evening and Friday morning
commutes.
* ADDITIONAL DETAILS...There will be a lull in the snow Friday
afternoon with another round of snow expected Friday evening into
Saturday afternoon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling. The latest road
conditions can be obtained by calling 5 1 1 or visiting the MDT Road
Report website.
Remember, a Winter Weather Advisory means that there is at least an
80% chance of minor impacts due to winter weather conditions during
the advisory period.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
102 PM MST Thu Dec 4 2025
...PROLONGED SNOW EVENT...
.A plume of snow will continue to impacted north central Idaho into
west central and southwest Montana tonight. The snow activity will
decrease in intensity during the day on Friday, then a second plume
of precipitation will impact the region late Friday through Saturday.
IDZ009-010-051800-
/O.NEW.KMSO.WW.Y.0046.251205T0000Z-251205T1800Z/
Western Lemhi County-Eastern Lemhi County-
102 PM MST Thu Dec 4 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO 11
AM MST FRIDAY...
* WHAT...Snow expected. There is a likelihood of minor to moderate
winter weather impacts. Total snow accumulations up to 3 inches in
the valleys and 4 to 9 inches in the higher terrain and mountain
passes.
* WHERE...Highway 28 Tendoy to Lone Pine, Lemhi Pass, Shoup, Bannock
Pass, Williams Creek Summit, Highway 93 Lost Trail Pass to
Gibbonsville, and Salmon.
* WHEN...From 5 PM this afternoon to 11 AM MST Friday.
* IMPACTS...Plan on slippery road conditions. The hazardous
conditions could impact the Thursday evening and Friday morning
commutes, especially over higher passes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling. The latest road
conditions for the state you are calling from can be obtained by
calling 5 1 1.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
102 PM MST Thu Dec 4 2025
...PROLONGED SNOW EVENT...
.A plume of snow will continue to impacted north central Idaho into
west central and southwest Montana tonight. The snow activity will
decrease in intensity during the day on Friday, then a second plume
of precipitation will impact the region late Friday through Saturday.
MTZ003-051800-
/O.NEW.KMSO.WW.Y.0046.251205T0000Z-251205T1800Z/
Flathead/Mission Valleys-
102 PM MST Thu Dec 4 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO 11
AM MST FRIDAY...
* WHAT...Snow expected. There is a likelihood of moderate to
isolated major winter weather impacts. Total snow accumulations up
to 4 inches mainly in the Mission Valley.
* WHERE...Flathead Valley, Mission Valley, Polson, and Flathead Lake.
* WHEN...From 5 PM this afternoon to 11 AM MST Friday.
* IMPACTS...Plan on slippery road conditions. The hazardous
conditions could impact the Thursday evening and Friday morning
commutes, especially over higher passes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling. The latest road
conditions for the state you are calling from can be obtained by
calling 5 1 1.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
102 PM MST Thu Dec 4 2025
...PROLONGED SNOW EVENT...
.A plume of snow will continue to impacted north central Idaho into
west central and southwest Montana tonight. The snow activity will
decrease in intensity during the day on Friday, then a second plume
of precipitation will impact the region late Friday through Saturday.
MTZ005-051800-
/O.NEW.KMSO.WW.Y.0046.251205T0000Z-251205T1800Z/
Missoula/Bitterroot Valleys-
102 PM MST Thu Dec 4 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO 11
AM MST FRIDAY...
* WHAT...Snow expected. There is a likelihood of moderate to
isolated major winter weather impacts. Total snow accumulations up
to 3 inches mainly in the Missoula Valley and benches in the
Bitterroot Valley.
* WHERE...Missoula and Bitterroot Valley.
* WHEN...From 5 PM this afternoon to 11 AM MST Friday.
* IMPACTS...Plan on slippery road conditions. The hazardous
conditions could impact the Thursday evening and Friday morning
commutes, especially over higher passes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling. The latest road
conditions for the state you are calling from can be obtained by
calling 5 1 1.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
102 PM MST Thu Dec 4 2025
...PROLONGED SNOW EVENT...
.A plume of snow will continue to impacted north central Idaho into
west central and southwest Montana tonight. The snow activity will
decrease in intensity during the day on Friday, then a second plume
of precipitation will impact the region late Friday through Saturday.
MTZ007-051800-
/O.NEW.KMSO.WW.Y.0046.251205T0000Z-251205T1800Z/
Butte/Blackfoot Region-
102 PM MST Thu Dec 4 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO 11
AM MST FRIDAY...
* WHAT...Snow expected. There is a likelihood of moderate winter
weather impacts. Total snow accumulations up to 6 inches.
* WHERE...Highway 12 Garrison to Elliston, MacDonald Pass, Butte,
Georgetown Lake, and Homestake Pass.
* WHEN...From 5 PM this afternoon to 11 AM MST Friday.
* IMPACTS...For MODERATE winter weather impacts, expect disruptions
to normal activities. Hazardous traveling conditions. Use extra
caution while driving. Closures and disruptions to infrastructure
may occur.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling. The latest road
conditions for the state you are calling from can be obtained by
calling 5 1 1.
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Billings MT
1256 PM MST Thu Dec 4 2025
MTZ171-052000-
/O.CON.KBYZ.WW.Y.0039.251205T0000Z-251205T2100Z/
Pryor/Northern Bighorn Mountains-
1256 PM MST Thu Dec 4 2025
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON
TO 2 PM MST FRIDAY...
* WHAT...Snow expected. Total snow accumulations between 4 and 8
inches, greatest on northwest facing slopes. Winds gusting as high
as 30 mph.
* WHERE...Pryor/Northern Bighorn Mountains.
* WHEN...From 5 PM this afternoon to 2 PM MST Friday.
* IMPACTS...Recreation in the backcountry will be impacted by heavy
accumulating snow and blowing snow.
* ADDITIONAL DETAILS...Those in the backcountry should ensure they
are prepared for dangerous winter conditions.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling. For the latest road
conditions, call 5 1 1.
&&
$$
Additional graphics for this hazard can be found at
http://www.weather.gov/billings
WMR/TC
URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
1229 PM MST Thu Dec 4 2025
WYZ001-002-051300-
/O.CON.KRIW.WW.Y.0034.251205T0000Z-251206T2100Z/
Yellowstone National Park-Absaroka Mountains-
Including the cities of Mammoth, Old Faithful, and Lake
1229 PM MST Thu Dec 4 2025
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS
AFTERNOON TO 2 PM MST SATURDAY...
* WHAT...Snow expected. Total snow accumulations of 4 to 8 inches;
accumulations of 10 to 15 inches at the South and Northeast
entrances and near Pahaska; locally higher amounts of 20 to 30
inches in the higher elevations in the Pitchstone Plateau and the
western slopes of the Absarokas. Winds gusting as high as 45 mph
over the Absarokas through the period. Gusts as high as 35 mph in
Yellowstone NP Friday night.
* WHERE...Absaroka Mountains and Yellowstone National Park.
* WHEN...From 5 PM this afternoon to 2 PM MST Saturday.
* IMPACTS...Travel could be very difficult. The hazardous conditions
could impact the Thursday evening and Friday morning commutes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling.
For graphical depictions of the snowfall forecast, including the
official NWS forecast, high end amounts, and low end amounts, visit
https://weather.gov/riw/winter .
For winter road conditions from the Wyoming Department of
Transportation, visit https://wyoroad.info .
&&
$$
URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
1229 PM MST Thu Dec 4 2025
WYZ008-051300-
/O.CON.KRIW.WW.Y.0034.251205T0000Z-251206T2100Z/
Bighorn Mountains West-
1229 PM MST Thu Dec 4 2025
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS
AFTERNOON TO 2 PM MST SATURDAY...
* WHAT...Snow expected. Total snow accumulations of 10 to 18 inches
from Cloud Peak and Granite Pass northward. Minimal snowfall
amounts south of Powder River Pass.
* WHERE...Bighorn Mountains West.
* WHEN...From 5 PM this afternoon to 2 PM MST Saturday.
* IMPACTS...Travel could be very difficult over Granite and Powder
River Passes. The hazardous conditions could impact the Thursday
evening and Friday morning commutes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow down and use caution while traveling.
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 .
&&
$$
Winter Storm Watch
URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
146 PM MST Thu Dec 4 2025
...SERIES OF WINTER STORMS TO AFFECT THE MOUNTAINS AND PASSES
THROUGH THE SATURDAY...
.The first round of heavy snow is expected to last through early
Friday morning and will primarily focus on the mountains of central
and southwest Montana with 4 to 8 inches possible along the mountain
passes including Bozeman and Kings Hill Pass. A period of lighter
snowfall is expected Friday morning and afternoon. The second and
more widespread round of heavier snowfall is expected to arrive
Friday evening and continue into Saturday evening with an additional
6 to 12 inches possible over the passes and higher amounts above
pass level.
MTZ301-307-051200-
/O.EXT.KTFX.WS.A.0018.251206T0000Z-251207T1500Z/
East Glacier Park Region-Southern Rocky Mountain Front-
Including the following locations: Saint Mary, Marias Pass, Logan
Pass, Kiowa, East Glacier Park, Rogers Pass, and Babb
146 PM MST Thu Dec 4 2025
...WINTER STORM WATCH NOW IN EFFECT FROM FRIDAY AFTERNOON THROUGH
SUNDAY MORNING...
* WHAT...Heavy snow possible. Total snow accumulations between 6 and
12 inches possible. Winds could gust as high as 55 mph.
* WHERE...The Continental Divide along the Rocky Mountain Front.
* WHEN...From Friday afternoon through Sunday morning.
* IMPACTS...Tire chains may be required for some vehicles if
traveling through mountain passes. Strong winds could cause tree
damage.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the latest forecasts for updates on this situation.
Remember, a Winter Storm Watch means that there is at least a 50%
chance of impactful winter weather conditions during the watch
period.
&&
$$
Glinskas
URGENT - WINTER WEATHER MESSAGE
National Weather Service Missoula MT
102 PM MST Thu Dec 4 2025
...PROLONGED SNOW EVENT...
.A plume of snow will continue to impacted north central Idaho into
west central and southwest Montana tonight. The snow activity will
decrease in intensity during the day on Friday, then a second plume
of precipitation will impact the region late Friday through Saturday.
MTZ002-052015-
/O.EXT.KMSO.WS.A.0010.251206T0000Z-251207T1500Z/
West Glacier Region-
102 PM MST Thu Dec 4 2025
...WINTER STORM WATCH NOW IN EFFECT FROM FRIDAY AFTERNOON THROUGH
SUNDAY MORNING...
* WHAT...Heavy snow possible. There is a chance of moderate to major
winter weather impacts. Total snow accumulations between 10 and 25
inches possible. Winds could gust as high as 40 mph.
* WHERE...Marias Pass, Highway 83 Bigfork to Swan Lake, Polebridge,
Glacier National Park, Bad Rock Canyon, and Essex.
* WHEN...From Friday afternoon through Sunday morning.
* 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...
Monitor the latest forecasts for updates on this situation.
&&
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Riverton WY
456 AM MST Thu Dec 4 2025
WYZ001>020-022>030-051600-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Bighorn Basin-Southwest Bighorn Basin-Southeast Bighorn Basin-
Owl Creek and Bridger Mountains-Bighorn Mountains West-
Bighorn Mountains Southeast-Northeast Johnson County-
Southeast Johnson County-Teton and Gros Ventre Mountains-
Jackson Hole-Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
456 AM MST Thu Dec 4 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO
2 PM MST SATURDAY...
...WINTER STORM WARNING REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON
TO 2 PM MST SATURDAY...
This Hazardous Weather Outlook is for Western and Central Wyoming.
.DAY ONE...Today and tonight.
Periods of moderate to heavy snow begins late this afternoon and
evening and continues through the overnight hours across the Western
Mountains, Jackson and Star Valleys, and the northern portions of the
western Bighorns. Gusty winds combined with heavy snow could cause
reduced visibilities and hazardous travel.
Wind gusts of 20 to 35 mph are expected across the Wind Corridor,
the Absarokas, including the Cody area, and the upper Wind River
Basin through the afternoon. Isolated gusts of 50 mph are possible in
wind prone locations.
.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
Friday through Saturday...Periods of snow throughout the day Friday,
with moderate to heavy snow beginning Friday evening and continuing
through Saturday morning across the Western Mountains and the
portions of the western Bighorns. Gusty 25 to 40 mph winds combined
with moderate to heavy snow could cause reduced visibilities and
hazardous travel.
Wind gusts of 30 to 40 mph late Friday night across southern
Wyoming, the Absarokas, northern Johnson County, and the Wind River
Basin through the afternoon. Isolated gusts over 55 mph are also
possible.
Sunday through Wednesday...Multiple chances for snow across the
western mountains and widespread breezy to gusty winds.
.SPOTTER INFORMATION STATEMENT...
Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.
$$
