Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Winter Weather Advisory |
| Area(s): | Red Lodge Foothills; Beartooth Foothills |
| Effective: | 2026-05-17 @ 7:46 pm -> 2026-05-18 @ 1:00 pm |
| Onset: | 2026-05-17 @ 7:46 pm -> 2026-05-18 @ 1:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-05-17 @ 7:46 pm |
| Headline: | Winter Weather Advisory issued May 17 at 6:46PM MDT until May 18 at 12:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Snow and blowing snow. Total snow accumulations up to 3 inches, greatest near the higher terrain. Winds gusting as high as 35 mph. * WHERE...Beartooth Foothills and Red Lodge Foothills. * WHEN...Until noon MDT Monday. * IMPACTS...Plan on difficult driving conditions due to poor visibility and slick roads. The hazardous conditions may impact the Monday morning commute. * ADDITIONAL DETAILS...Locally heavier snowfall is possible in the foothills above 6000 feet. Snow accumulations will decrease away from the mountains and foothills. |
| Alert: | Winter Weather Advisory |
| Area(s): | Pryor/Northern Bighorn Mountains; Northeast Bighorn Mountains |
| Effective: | 2026-05-17 @ 7:46 pm -> 2026-05-18 @ 1:00 pm |
| Onset: | 2026-05-17 @ 7:46 pm -> 2026-05-18 @ 1:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-05-17 @ 7:46 pm |
| Headline: | Winter Weather Advisory issued May 17 at 6:46PM MDT until May 18 at 12:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Snow and blowing snow. Total snow accumulations between 4 and 8 inches, greatest in the Bighorn Mountains. Winds gusting as high as 45 mph. * WHERE...In Montana, Pryor/Northern Bighorn Mountains. In Wyoming, Northeast Bighorn Mountains. * WHEN...Until noon MDT Monday. * IMPACTS...Snow and blowing snow will impact back country recreation and travel along Highway 14 through the Bighorn Mountains. |
| Alert: | Winter Weather Advisory |
| Area(s): | Southern Rocky Mountain Front; Upper Blackfoot and MacDonald Pass |
| Effective: | 2026-05-17 @ 7:17 pm -> 2026-05-18 @ 1:00 am |
| Onset: | 2026-05-17 @ 7:17 pm -> 2026-05-18 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-05-17 @ 7:17 pm |
| Headline: | Winter Weather Advisory issued May 17 at 6:17PM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Snow. Additional snow accumulations of 1 to 2 inches. * WHERE...Upper Blackfoot and MacDonald Pass and Southern Rocky Mountain Front. * WHEN...Until midnight MDT tonight. * IMPACTS...Plan on slippery road conditions. |
| Alert: | Winter Weather Advisory |
| Area(s): | Little Belt and Highwood Mountains |
| Effective: | 2026-05-17 @ 7:17 pm -> 2026-05-18 @ 1:00 am |
| Onset: | 2026-05-17 @ 7:17 pm -> 2026-05-18 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-05-17 @ 7:17 pm |
| Headline: | Winter Weather Advisory issued May 17 at 6:17PM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Snow. Additional snow accumulations of 1 to 2 inches. * WHERE...Little Belt and Highwood Mountains. * WHEN...Until midnight MDT tonight. * IMPACTS...Plan on slippery road conditions. |
| Alert: | Frost Advisory |
| Area(s): | Kootenai/Cabinet Region |
| Effective: | 2026-05-17 @ 6:01 pm -> 2026-05-18 @ 9:00 am |
| Onset: | 2026-05-18 @ 1:00 am -> 2026-05-18 @ 9:00 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-05-17 @ 6:01 pm |
| Headline: | Frost Advisory issued May 17 at 5:01PM MDT until May 18 at 8:00AM MDT by NWS Missoula MT |
| Description: |
* WHAT...Temperatures between 25 and 34 degrees will result in frost formation. * WHERE...Kootenai/Cabinet Region. * WHEN...From midnight tonight to 8 AM MDT Monday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Temperature ranges include: 31 to 35 degrees in Eureka, 25 to 28 in Olney, 32 to 36 Libby and Troy areas, 30 to 35 south of Libby to Happys Inn and 26 to 31 Marion and Yaak areas. |
| Alert: | Frost Advisory |
| Area(s): | Lower Clark Fork Region |
| Effective: | 2026-05-17 @ 6:01 pm -> 2026-05-18 @ 9:00 am |
| Onset: | 2026-05-18 @ 1:00 am -> 2026-05-18 @ 9:00 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-05-17 @ 6:01 pm |
| Headline: | Frost Advisory issued May 17 at 5:01PM MDT until May 18 at 8:00AM MDT by NWS Missoula MT |
| Description: |
* WHAT...Temperatures between 25 and 34 degrees will result in frost formation. * WHERE...Lower Clark Fork Region. * WHEN...From midnight tonight to 8 AM MDT Monday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Temperature ranges include:28 to 32 degrees in Thompson Falls, 30 to 34 degrees in Plains, 33 to 37 degrees in Noxon, 25 to 28 degrees in Haugan, 29 to 32 degrees in St. Regis, and 29 to 34 degrees in Alberton. |
| Alert: | Frost Advisory |
| Area(s): | Flathead/Mission Valleys; Missoula/Bitterroot Valleys |
| Effective: | 2026-05-17 @ 6:01 pm -> 2026-05-18 @ 10:00 am |
| Onset: | 2026-05-17 @ 9:00 pm -> 2026-05-18 @ 10:00 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-05-17 @ 6:01 pm |
| Headline: | Frost Advisory issued May 17 at 5:01PM MDT until May 18 at 9:00AM MDT by NWS Missoula MT |
| Description: |
* WHAT...Temperatures as low as 28 degrees will result in frost formation. * WHERE...Flathead/Mission Valleys and Missoula/Bitterroot Valleys. * WHEN...From 8 PM this evening to 9 AM MDT Monday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Low-lying areas of the Bitterroot Valley could fall between 24 and 28 degrees. |
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-05-17 @ 12:46 pm -> 2026-05-18 @ 1:00 am |
| Onset: | 2026-05-17 @ 12:46 pm -> 2026-05-18 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-05-17 @ 12:46 pm |
| Headline: | Lake Wind Advisory issued May 17 at 11:46AM MDT until May 18 at 12:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Northwest winds 15 to 25 mph with gusts up to 40 mph. * WHERE...Fort Peck Lake. * WHEN...Until midnight MDT tonight. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. |
| Alert: | Winter Weather Advisory |
| Area(s): | Bitterroot/Sapphire Mountains; Butte/Blackfoot Region |
| Effective: | 2026-05-17 @ 9:50 am -> 2026-05-18 @ 1:00 am |
| Onset: | 2026-05-17 @ 9:50 am -> 2026-05-18 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-05-17 @ 9:50 am |
| Headline: | Winter Weather Advisory issued May 17 at 8:50AM MDT until May 18 at 12:00AM MDT by NWS Missoula MT |
| Description: |
* WHAT...Snow expected. Total snow accumulations of 2 to 6 inches in the mountain terrain above 5000 feet. Accumulations up to 10 inches above 6,000 ft. Slushy accumulations possible for Lost Trail, Homestake and MacDonald Passes and around Georgetown Lake. Winds gusting as high as 35 mph. * WHERE...Highway 93 Sula to Lost Trail Pass, Homestake Pass, Georgetown Lake, MacDonald Pass, Butte, and Lolo Pass. * WHEN...Until midnight MDT tonight. * IMPACTS...Plan on slippery backcountry road conditions. Cold, wet and breezy conditions may create hypothermia risk for those recreating in the backcountry. |
| Alert: | Winter Weather Advisory |
| Area(s): | West Glacier Region; Potomac/Seeley Lake Region |
| Effective: | 2026-05-17 @ 9:50 am -> 2026-05-18 @ 1:00 am |
| Onset: | 2026-05-17 @ 9:50 am -> 2026-05-18 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-05-17 @ 9:50 am |
| Headline: | Winter Weather Advisory issued May 17 at 8:50AM MDT until May 18 at 12:00AM MDT by NWS Missoula MT |
| Description: |
* WHAT...Snow expected. Total snow accumulations of 2 to 6 inches in the mountain terrain above 5000 feet. Accumulations up to 10 inches above 6,000 ft. Slushy accumulations possible on Marias Pass. * WHERE...The higher terrain of Glacier National Park. * WHEN...Until midnight MDT tonight. * IMPACTS...Plan on slippery backcountry road conditions. Cold, wet and breezy conditions may create hypothermia risk for those recreating in the backcountry. |