Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Winter Weather Advisory |
| Area(s): | Musselshell; Northern Stillwater; Golden Valley |
| Effective: | 2025-12-21 @ 5:28 pm -> 2025-12-22 @ 6:00 am |
| Onset: | 2025-12-21 @ 5:28 pm -> 2025-12-22 @ 6:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2025-12-21 @ 5:28 pm |
| Headline: | Winter Weather Advisory issued December 21 at 4:28PM MST until December 22 at 5:00AM MST by NWS Billings MT |
| Description: |
* WHAT...Mixed precipitation, including light freezing rain. Snow accumulations up to one inch and ice accumulations around a light glaze possible. * WHERE...Golden Valley, Musselshell, and Northern Stillwater. * WHEN...Until 5 AM MST Monday. * IMPACTS...Roads will likely become slick and hazardous. * ADDITIONAL DETAILS...Motorists should be alert for sudden changes in driving conditions and slick roads this evening into tonight. |
| Alert: | Winter Weather Advisory |
| Area(s): | Northern Park; Judith Gap; Livingston Area; Beartooth Foothills; Northern Sweet Grass; Melville Foothills; Southern Wheatland |
| Effective: | 2025-12-21 @ 5:28 pm -> 2025-12-22 @ 6:00 am |
| Onset: | 2025-12-21 @ 5:28 pm -> 2025-12-22 @ 6:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2025-12-21 @ 5:28 pm |
| Headline: | Winter Weather Advisory issued December 21 at 4:28PM MST until December 22 at 5:00AM MST by NWS Billings MT |
| Description: |
* WHAT...Mixed precipitation, including freezing rain. Snow accumulations up to 2 inches and ice accumulations up to 0.05 inches possible. * WHERE...Portions of central and south central Montana. * WHEN...Until 5 AM MST Monday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. * ADDITIONAL DETAILS...Motorists along Interstate 90 around the Big Timber area, along Highway 191 from Big Timber to Judith Gap, and along Highway 89 around Clyde Park and Wilsall, should be alert for sudden changes in driving conditions and slick roads this evening into tonight. |
| Alert: | Winter Storm Warning |
| Area(s): | Absaroka/Beartooth Mountains; Crazy Mountains |
| Effective: | 2025-12-21 @ 5:28 pm -> 2025-12-22 @ 6:00 pm |
| Onset: | 2025-12-21 @ 5:28 pm -> 2025-12-22 @ 5:30 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2025-12-21 @ 5:28 pm |
| Headline: | Winter Storm Warning issued December 21 at 4:28PM MST until December 22 at 5:00PM MST by NWS Billings MT |
| Description: |
* WHAT...Periods of heavy snow. Total snow accumulations of 1 to 3 feet in the Absaroka-Beartooth Mountains and 8 to 15 inches in the Crazy Mountains, mainly on south and west facing slopes. Winds gusting as high as 45 mph. * WHERE...Absaroka/Beartooth Mountains and Crazy Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Recreation in the high country will be impacted by heavy accumulating snow and blowing snow. * ADDITIONAL DETAILS...Avalanche danger will continue. |
| Alert: | Winter Weather Advisory |
| Area(s): | Northwest Beaverhead County; Gallatin and Madison County Mountains and Centennial Mountains |
| Effective: | 2025-12-21 @ 2:53 pm -> 2025-12-22 @ 10:00 am |
| Onset: | 2025-12-21 @ 2:53 pm -> 2025-12-22 @ 6:30 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2025-12-21 @ 2:53 pm |
| Headline: | Winter Weather Advisory issued December 21 at 1:53PM MST until December 22 at 9:00AM MST by NWS Great Falls MT |
| Description: |
* WHAT...Snow and mixed precipitation expected. Additional snow accumulations up to 2 inches over the valleys and 2 to 5 inches at and above pass level. The snow may mix with light freezing rain or drizzle this evening and tonight with ice accumulations up to a glaze. Winds may gust as high as 40 mph at times. * WHERE...Gallatin and Madison County Mountains and Centennial Mountains and Northwest Beaverhead County. * WHEN...Until 9 AM MST Monday. * IMPACTS...Plan for winter driving conditions. Sidewalks and other surfaces may become icy and slippery in areas that observe freezing rain or drizzle. |
| Alert: | Winter Weather Advisory |
| Area(s): | Eastern Toole and Liberty; Hill County; Northern Blaine County; Western and Central Chouteau County |
| Effective: | 2025-12-21 @ 2:53 pm -> 2025-12-22 @ 12:00 pm |
| Onset: | 2025-12-21 @ 9:00 pm -> 2025-12-22 @ 6:30 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2025-12-21 @ 2:53 pm |
| Headline: | Winter Weather Advisory issued December 21 at 1:53PM MST until December 22 at 11:00AM MST by NWS Great Falls MT |
| Description: |
* WHAT...There is a slight chance for light freezing rain developing late tonight through Monday morning. Total ice accumulations around a light glaze possible. * WHERE...Eastern Toole and Liberty Counties, Hill County, Northern Blaine County, and Western and Central Chouteau County. * WHEN...From 8 PM this evening to 11 AM MST Monday. * IMPACTS...Very slippery sidewalks, roads and bridges are possible. |
| Alert: | Winter Weather Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Western Roosevelt; Garfield; McCone; Richland; Dawson; Prairie; Northern Phillips; Northern Valley; Eastern Roosevelt |
| Effective: | 2025-12-21 @ 1:52 pm -> 2025-12-22 @ 1:00 pm |
| Onset: | 2025-12-21 @ 9:00 pm -> 2025-12-22 @ 5:45 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2025-12-21 @ 1:52 pm |
| Headline: | Winter Weather Advisory issued December 21 at 12:52PM MST until December 22 at 12:00PM MST by NWS Glasgow MT |
| Description: |
* WHAT...Mixed precipitation expected. Total snow accumulations up to one inch and ice accumulations up to 0.05 inches. * WHERE...A portion of northeast Montana. * WHEN...From 8 PM this evening to noon MST Monday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Monday morning commute. |
| Alert: | Winter Weather Advisory |
| Area(s): | Bitterroot/Sapphire Mountains |
| Effective: | 2025-12-21 @ 12:43 pm -> 2025-12-22 @ 10:00 am |
| Onset: | 2025-12-21 @ 12:43 pm -> 2025-12-22 @ 10:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2025-12-21 @ 12:43 pm |
| Headline: | Winter Weather Advisory issued December 21 at 11:43AM MST until December 22 at 9:00AM MST by NWS Missoula MT |
| Description: |
* WHAT...Snow expected. There is a likelihood of minor winter weather impacts. Total snow accumulations 5 to 10 inches. * WHERE...Highway 93 Sula to Lost Trail Pass and Lolo Pass. * WHEN...Until 9 AM MST Monday. * IMPACTS...For MODERATE winter weather impacts, expect disruptions to normal activities. Use extra caution while driving. The Monday morning commute could be affected, especially over higher passes. * ADDITIONAL DETAILS...Watch out for black ice during the night. Take it slow, especially around curves. |
| Alert: | Winter Weather Advisory |
| Area(s): | West Glacier Region |
| Effective: | 2025-12-21 @ 12:43 pm -> 2025-12-22 @ 12:00 pm |
| Onset: | 2025-12-21 @ 6:00 pm -> 2025-12-22 @ 12:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2025-12-21 @ 12:43 pm |
| Headline: | Winter Weather Advisory issued December 21 at 11:43AM MST until December 22 at 11:00AM MST by NWS Missoula MT |
| Description: |
* WHAT...Snow. There is a likelihood of developing or ongoing minor to moderate winter weather impacts. Snow accumulations between 1 and 4 inches, except between 4 and 8 inches in the mountains. * WHERE...Bad Rock Canyon, Marias Pass, Essex, Glacier National Park, Polebridge, and Highway 83 Bigfork to Swan Lake. * WHEN...From 5 PM this afternoon to 11 AM MST Monday. * IMPACTS...For MINOR winter weather impacts, expect a few inconveniences to normal activities. Use caution while driving. For MODERATE winter weather impacts, expect disruptions to normal activities. Use extra caution while driving. The Monday morning commute could be affected, especially over higher passes. * ADDITIONAL DETAILS...Watch out for black ice during the night. Take it slow, especially around curves. Westerly winds will increase overnight, gusting between 35 and 45 mph at Marias Pass. |
| Alert: | Winter Weather Advisory |
| Area(s): | Butte/Blackfoot Region; Potomac/Seeley Lake Region |
| Effective: | 2025-12-21 @ 12:43 pm -> 2025-12-22 @ 12:00 pm |
| Onset: | 2025-12-21 @ 12:43 pm -> 2025-12-22 @ 12:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2025-12-21 @ 12:43 pm |
| Headline: | Winter Weather Advisory issued December 21 at 11:43AM MST until December 22 at 11:00AM MST by NWS Missoula MT |
| Description: |
* WHAT...Snow. There is a likelihood of developing or ongoing minor to moderate winter weather impacts. Snow accumulations between 1 and 4 inches, except 5 to 14 inches in the mountains. * WHERE...Homestake Pass, Georgetown Lake, MacDonald Pass, Highway 83 Seeley Lake to Condon, Highway 200 Bonner to Greenough, Butte, Highway 12 Garrison to Elliston, and I-90 East Missoula to Bearmouth. * WHEN...Until 11 AM MST Monday. * IMPACTS...For MINOR winter weather impacts, expect a few inconveniences to normal activities. Use caution while driving. For MODERATE winter weather impacts, expect disruptions to normal activities. Use extra caution while driving. The Monday morning commute could be affected, especially over higher passes. * ADDITIONAL DETAILS...Watch out for black ice during the night. Take it slow, especially around curves. Westerly winds will increase overnight, gusting between 30 and 40 mph between Georgetown Lake and Anaconda, Homestake Pass and MacDonald Pass. |
| Alert: | Winter Weather Advisory |
| Area(s): | Kootenai/Cabinet Region; Lower Clark Fork Region |
| Effective: | 2025-12-21 @ 12:43 pm -> 2025-12-22 @ 12:00 pm |
| Onset: | 2025-12-21 @ 12:43 pm -> 2025-12-22 @ 12:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2025-12-21 @ 12:43 pm |
| Headline: | Winter Weather Advisory issued December 21 at 11:43AM MST until December 22 at 11:00AM MST by NWS Missoula MT |
| Description: |
* WHAT...Snow. There is a likelihood of developing or ongoing minor to moderate winter weather impacts. Snow accumulations of 1 to 3 inches, except 4 to 7 inches at Lookout Pass. A wintry mix may occur. * WHERE...Evaro Hill, Highway 200 Trout Creek to Heron, Highway 2 Kalispell to Libby, Highway 56 Bull Lake Road, Highway 200 Thompson Falls to Plains, Highway 93 Eureka to Whitefish, Highway 37 Eureka to Libby, and I-90 Lookout Pass to Haugan. * WHEN...Until 11 AM MST Monday. * IMPACTS...For MINOR winter weather impacts, expect a few inconveniences to normal activities. Use caution while driving. For MODERATE winter weather impacts, expect disruptions to normal activities. Use extra caution while driving. The Monday morning commute could be affected, especially over higher passes. * ADDITIONAL DETAILS...Watch out for black ice during the night. Take it slow, especially around curves. |
| Alert: | Winter Weather Advisory |
| Area(s): | Flathead/Mission Valleys |
| Effective: | 2025-12-21 @ 12:43 pm -> 2025-12-22 @ 12:00 pm |
| Onset: | 2025-12-21 @ 7:00 pm -> 2025-12-22 @ 12:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2025-12-21 @ 12:43 pm |
| Headline: | Winter Weather Advisory issued December 21 at 11:43AM MST until December 22 at 11:00AM MST by NWS Missoula MT |
| Description: |
* WHAT...Snow. There is a likelihood of developing or ongoing minor to moderate winter weather impacts. Snow accumulations up to 1 inch. A wintry mix may occur. * WHERE...Flathead Valley, Flathead Lake, Polson, and Mission Valley. * WHEN...From 6 PM this evening to 11 AM MST Monday. * IMPACTS...For MINOR winter weather impacts, expect a few inconveniences to normal activities. Use caution while driving. For MODERATE winter weather impacts, expect disruptions to normal activities. Use extra caution while driving. The Monday morning commute could be affected, especially over higher passes. * ADDITIONAL DETAILS...Watch out for black ice during the night. Take it slow, especially around curves. |
| Alert: | Winter Weather Advisory |
| Area(s): | Missoula/Bitterroot Valleys |
| Effective: | 2025-12-21 @ 12:43 pm -> 2025-12-22 @ 12:00 pm |
| Onset: | 2025-12-21 @ 7:00 pm -> 2025-12-22 @ 12:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2025-12-21 @ 12:43 pm |
| Headline: | Winter Weather Advisory issued December 21 at 11:43AM MST until December 22 at 11:00AM MST by NWS Missoula MT |
| Description: |
* WHAT...Snow. There is a likelihood of developing or ongoing minor to moderate winter weather impacts. Snow accumulations up to 1 inch in the Missoula Valley, 1 to 2 inches in the Bitterroot Valley. A wintry mix may occur. * WHERE...Missoula and Bitterroot Valley. * WHEN...From 6 PM this evening to 11 AM MST Monday. * IMPACTS...For MINOR winter weather impacts, expect a few inconveniences to normal activities. Use caution while driving. For MODERATE winter weather impacts, expect disruptions to normal activities. Use extra caution while driving. The Monday morning commute could be affected, especially over higher passes. * ADDITIONAL DETAILS...Snow may switch to a wintry mix or rain at times. Should snow levels rise slower than forecast, an additional 1 to 2 inches of snow is possible, particularly in the Bitterroot Valley. Watch out for black ice during the night. Take it slow, especially around curves. |
| Alert: | Avalanche Warning |
| Area(s): | Absaroka/Beartooth Mountains |
| Effective: | 2025-12-21 @ 7:04 am |
| Onset: | 2025-12-21 @ 7:04 am -> 2025-12-22 @ 7:15 am |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Billings MT on 2025-12-21 @ 7:04 am |
| Headline: | Avalanche Warning issued December 21 at 6:04AM MST by NWS Billings MT |
| Description: |
AVWBYZ The following message is transmitted at the request of the Gallatin National Forest Avalanche Center. The Gallatin NF Avalanche Center in Bozeman has issued a BACKCOUNTRY AVALANCHE WARNING for the following areas: * WHAT...The Gallatin National Forest Avalanche Center is issuing an avalanche warning. The avalanche danger is HIGH on all slopes. Natural and human-triggered slides are very likely. * WHERE...The mountains near Island Park, West Yellowstone and Cooke City. * WHEN...In effect until Mon 05:30 AM MST. * IMPACTS...Heavy snowfall on a snowpack with unstable weak layers will make human triggered avalanches very likely. * PRECAUTIONARY / PREPAREDNESS ACTIONS...Very dangerous avalanche conditions exist. Backcountry travelers should stayoff steep slopes and away from the bottom of steep slopes. Avalanches can be triggered from flat terrain. Steep slopes can avalanche far above and run into lower-angled terrain. Consult http://www.mtavalanche.com or www.avalanche.org for more detailed information. Similar avalanche danger may exist at locations outside the coverage area of this or any avalanche center. |
| Alert: | Avalanche Warning |
| Area(s): | Gallatin and Madison County Mountains and Centennial Mountains |
| Effective: | 2025-12-21 @ 7:04 am |
| Onset: | 2025-12-21 @ 7:04 am -> 2025-12-22 @ 7:15 am |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Great Falls MT on 2025-12-21 @ 7:04 am |
| Headline: | Avalanche Warning issued December 21 at 6:04AM MST by NWS Great Falls MT |
| Description: |
AVWTFX The Gallatin National Forest Avalanche Center has issued an avalanche warning. * WHAT... The avalanche danger is HIGH on all slopes. Natural and human-triggered slides are very likely. * WHERE...The mountains near Island Park, West Yellowstone * WHEN...In effect through Monday 530 AM MST. * IMPACTS...Heavy snowfall on a snowpack with unstable weak layers will make human triggered avalanches very likely. * PRECAUTIONARY / PREPAREDNESS ACTIONS...Very dangerous avalanche conditions exist. Backcountry travelers should stay off steep slopes and away from the bottom of steep slopes. Avalanches can be triggered from flat terrain. Steep slopes can avalanche far above and run into lower-angled terrain. Consult http://www.mtavalanche.com or www.avalanche.org for more detailed information. Similar avalanche danger may exist at locations outside the coverage area of this or any avalanche center. |