Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Winter Weather Advisory |
| Area(s): | East Glacier Park Region; Southern Rocky Mountain Front; Upper Blackfoot and MacDonald Pass; Elkhorn and Boulder Mountains |
| Effective: | 2026-05-17 @ 12:51 pm -> 2026-05-18 @ 1:00 am |
| Onset: | 2026-05-17 @ 12:51 pm -> 2026-05-18 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-05-17 @ 12:51 pm |
| Headline: | Winter Weather Advisory issued May 17 at 11:51AM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Snow. Additional snow accumulations up to two inches. Winds gusting as high as 40 mph. * WHERE...The Continental Divide along the Rocky Mountain Front, Upper Blackfoot and MacDonald Pass, and Elkhorn and Boulder Mountains. * WHEN...Until midnight MDT tonight. * IMPACTS...Plan on slippery backcountry road conditions. Wet and raw conditions may create hypothermia risk for those recreating in the backcountry. |
| Alert: | Winter Weather Advisory |
| Area(s): | Little Belt and Highwood Mountains; Big Belt, Bridger and Castle Mountains |
| Effective: | 2026-05-17 @ 12:51 pm -> 2026-05-18 @ 1:00 am |
| Onset: | 2026-05-17 @ 12:51 pm -> 2026-05-18 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-05-17 @ 12:51 pm |
| Headline: | Winter Weather Advisory issued May 17 at 11:51AM MDT until May 18 at 12:00AM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Snow. Additional snow accumulations up to two inches. Winds gusting as high as 40 mph. * WHERE...Big Belt, Bridger and Castle Mountains and Little Belt and Highwood Mountains. * WHEN...Until midnight MDT tonight. * IMPACTS...Plan on slippery backcountry road conditions. Wet and raw conditions may create hypothermia risk for those recreating in the backcountry. |
| 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): | Red Lodge Foothills; Beartooth Foothills |
| Effective: | 2026-05-17 @ 11:42 am -> 2026-05-18 @ 11:45 am |
| Onset: | 2026-05-17 @ 7:00 pm -> 2026-05-18 @ 1:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-05-17 @ 11:42 am |
| Headline: | Winter Weather Advisory issued May 17 at 10:42AM MDT until May 18 at 12:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Snow and blowing snow expected. Total snow accumulations 1 to 3 inches, with locally heavier accumulations close to the higher terrain. Winds gusting as high as 35 mph. * WHERE...Beartooth Foothills and Red Lodge Foothills. * WHEN...From 6 PM this evening to noon MDT Monday. * IMPACTS...Plan on difficult driving conditions due to poor visibility and slick roads. The hazardous conditions will impact the Monday morning commute. * ADDITIONAL DETAILS...The greatest snow accumulations will occur along the higher foothills near the mountains above 5000 feet. |
| Alert: | Winter Weather Advisory |
| Area(s): | Pryor/Northern Bighorn Mountains; Northeast Bighorn Mountains |
| Effective: | 2026-05-17 @ 11:42 am -> 2026-05-18 @ 11:45 am |
| Onset: | 2026-05-17 @ 7:00 pm -> 2026-05-18 @ 1:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-05-17 @ 11:42 am |
| Headline: | Winter Weather Advisory issued May 17 at 10:42AM MDT until May 18 at 12:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Snow and blowing snow expected. Total snow accumulations between 4 and 10 inches. Winds gusting as high as 45 mph. * WHERE...In Montana, Pryor/Northern Bighorn Mountains. In Wyoming, Northeast Bighorn Mountains. * WHEN...From 6 PM this evening to noon MDT Monday. * IMPACTS...Snow and blowing snow will impact back country recreation and travel along Highway 14 through the Bighorn Mountains. * ADDITIONAL DETAILS...Back country activities will be impacted by difficult winter conditions. |
| Alert: | Frost Advisory |
| Area(s): | Flathead/Mission Valleys; Missoula/Bitterroot Valleys |
| Effective: | 2026-05-17 @ 10:04 am -> 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 @ 10:04 am |
| Headline: | Frost Advisory issued May 17 at 9:04AM MDT until May 18 at 9:00AM MDT by NWS Missoula MT |
| Description: |
* WHAT...Temperatures as low as 29 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. |
| 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. |