Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Special Weather Statement |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Daniels; Sheridan; Western Roosevelt; McCone; Richland; Northern Phillips; Northern Valley; Eastern Roosevelt |
| Effective: | 2026-05-15 @ 2:46 pm -> 2026-05-15 @ 3:45 pm |
| Onset: | 2026-05-15 @ 2:46 pm |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-05-15 @ 2:46 pm |
| Headline: | Special Weather Statement issued May 15 at 1:46PM MDT by NWS Glasgow MT |
| Description: |
At 142 PM MDT, Doppler radar was tracking scattered thunderstorms across the area moving southeast at 45 mph. HAZARD...Wind gusts of 50 to 55 mph and up to half inch hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Locations impacted include... Glasgow, Wolf Point, Plentywood, Scobey, Poplar, Culbertson, Opheim, Whitewater, Richland, Fairview, Brockton, Medicine Lake, Bainville, Saco, Froid, Westby, Flaxville, Peerless, Hinsdale, and Lustre. |
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-05-15 @ 1:58 pm -> 2026-05-15 @ 10:00 pm |
| Onset: | 2026-05-15 @ 1:58 pm -> 2026-05-15 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-05-15 @ 1:58 pm |
| Headline: | Lake Wind Advisory issued May 15 at 12:58PM MDT until May 15 at 9:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...West northwest winds 20 to 30 mph with gusts up to 45 mph. * WHERE...Fort Peck Lake. * WHEN...Until 9 PM MDT this evening. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. * ADDITIONAL DETAILS...Wave heights up to 5 feet. |
| Alert: | Winter Weather Advisory |
| Area(s): | Gallatin and Madison County Mountains and Centennial Mountains |
| Effective: | 2026-05-15 @ 12:59 pm -> 2026-05-16 @ 7:00 am |
| Onset: | 2026-05-16 @ 6:00 pm -> 2026-05-17 @ 7:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-05-15 @ 12:59 pm |
| Headline: | Winter Weather Advisory issued May 15 at 11:59AM MDT until May 17 at 6:00AM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Snow expected. Total snow accumulations 3 to 7 inches, with higher amounts on high peaks. Winds gusting as high as 40 mph. * WHERE...Gallatin and Madison County Mountains and Centennial Mountains. * WHEN...From 5 PM Saturday to 6 AM MDT Sunday. * IMPACTS...Plan on slippery and slushy road conditions and raw back country conditions Saturday evening into Sunday. * ADDITIONAL DETAILS...Snow levels quickly fall Saturday evening after a round of showers and perhaps a couple thunderstorms Saturday afternoon. Those with back country plans should be aware of the forecast raw conditions. |
| Alert: | Winter Weather Advisory |
| Area(s): | Bitterroot/Sapphire Mountains; Butte/Blackfoot Region |
| Effective: | 2026-05-15 @ 12:38 pm -> 2026-05-18 @ 1:00 am |
| Onset: | 2026-05-17 @ 1:00 am -> 2026-05-18 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-05-15 @ 12:38 pm |
| Headline: | Winter Weather Advisory issued May 15 at 11:38AM 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. Slushy accumulations possible for Lost Trail, Homestake and MacDonald Passes and around Georgetown Lake. Winds gusting as high as 35 mph. * WHERE...Homestake Pass, Lolo Pass, Georgetown Lake, MacDonald Pass, Highway 93 Sula to Lost Trail Pass, and Butte. * WHEN...From midnight Saturday Night to midnight MDT Sunday Night. * 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: | 2026-05-15 @ 12:38 pm -> 2026-05-18 @ 1:00 am |
| Onset: | 2026-05-17 @ 1:00 am -> 2026-05-18 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-05-15 @ 12:38 pm |
| Headline: | Winter Weather Advisory issued May 15 at 11:38AM 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. Slushy accumulations possible on Marias Pass. * WHERE...The higher terrain of Glacier National Park. * WHEN...From midnight Saturday Night to midnight MDT Sunday Night. * IMPACTS...Plan on slippery backcountry road conditions. Cold, wet and breezy conditions may create hypothermia risk for those recreating in the backcountry. |
| Alert: | Red Flag Warning |
| Area(s): | Fort Peck Reservation and Daniels/Roosevelt/Sheridan Counties; Dawson/McCone/Prairie/Richland/Wibaux Counties; Northern Valley and Northern Phillips Counties; The Little Rockies; The Lower Missouri River Breaks including the Charles M Russell National Wildlife Refuge; Southern Petroleum and Southern Garfield Counties |
| Effective: | 2026-05-15 @ 6:59 am -> 2026-05-15 @ 10:00 pm |
| Onset: | 2026-05-15 @ 6:59 am -> 2026-05-15 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-05-15 @ 6:59 am |
| Headline: | Red Flag Warning issued May 15 at 5:59AM MDT until May 15 at 9:00PM MDT by NWS Glasgow MT |
| Description: |
* AFFECTED AREA...Fire weather zones 120, 122, 134, 135, 136, and 137. * WIND...West 20 to 35 mph with gusts to 50 mph today. * HUMIDITY...As low as 20 percent today. * THUNDERSTORMS...Isolated thunderstorms north of HWY 2. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |