Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Special Weather Statement |
| Area(s): | West Glacier Region; Flathead/Mission Valleys |
| Effective: | 2026-05-20 @ 2:36 pm -> 2026-05-20 @ 3:00 pm |
| Onset: | 2026-05-20 @ 2:36 pm |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-05-20 @ 2:36 pm |
| Headline: | Special Weather Statement issued May 20 at 1:36PM MDT by NWS Missoula MT |
| Description: |
At 136 PM MDT, Doppler radar was tracking a strong thunderstorm 5 miles east of Evergreen, moving southeast at 15 mph. HAZARD...Half inch size hail. SOURCE...Radar indicated. IMPACT...Minor damage to outdoor objects is possible. Locations impacted include... Evergreen, Bigfork, Creston and La Salle. |
| Alert: | Special Weather Statement |
| Area(s): | Central and Southern Valley; Garfield; McCone |
| Effective: | 2026-05-20 @ 2:26 pm -> 2026-05-20 @ 3:30 pm |
| Onset: | 2026-05-20 @ 2:26 pm |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-05-20 @ 2:26 pm |
| Headline: | Special Weather Statement issued May 20 at 1:26PM MDT by NWS Glasgow MT |
| Description: |
At 125 PM MDT, Doppler radar was tracking a strong thunderstorm 24 miles northwest of The Pines Rec Area, or 25 miles southwest of Glasgow, moving east at 20 mph. HAZARD...Wind gusts up to 50 mph. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include... Glasgow, Nashua, Fort Peck, The Pines Rec Area, Fort Peck Marina, Duck Creek Rec Area, Rock Creek Rec Area, Haxby, Park Grove, The Bentonite Plant, and Whatley. |
| Alert: | Winter Storm Warning |
| Area(s): | Absaroka/Beartooth Mountains |
| Effective: | 2026-05-20 @ 1:55 pm -> 2026-05-21 @ 2:00 pm |
| Onset: | 2026-05-20 @ 7:00 pm -> 2026-05-21 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-05-20 @ 1:55 pm |
| Headline: | Winter Storm Warning issued May 20 at 12:55PM MDT until May 21 at 6:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Heavy snow expected...mainly on north facing slopes above 7000 ft. Total snow accumulations 8-13 inches. Winds gusting as high as 30 mph. * WHERE...Absaroka/Beartooth Mountains. * WHEN...From 6 PM this evening to 6 PM MDT Thursday. * IMPACTS...Recreation in the high country will be impacted by heavy accumulating snow. |
| Alert: | Winter Weather Advisory |
| Area(s): | Pryor/Northern Bighorn Mountains; Northeast Bighorn Mountains |
| Effective: | 2026-05-20 @ 1:55 pm -> 2026-05-21 @ 2:00 pm |
| Onset: | 2026-05-21 @ 4:00 am -> 2026-05-21 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-05-20 @ 1:55 pm |
| Headline: | Winter Weather Advisory issued May 20 at 12:55PM MDT until May 21 at 9:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Snow expected. Total snow accumulations 5 to 10 inches. Winds gusting as high as 30 mph. * WHERE...In Montana, Pryor/Northern Bighorn Mountains. In Wyoming, Northeast Bighorn Mountains. * WHEN...From 3 AM to 9 PM MDT Thursday. * IMPACTS...Travel could be difficult. The hazardous conditions will impact the Thursday morning and evening commutes. Roads, including US-14, will likely become slippery and hazardous. |