Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Severe Thunderstorm Warning |
| Area(s): | Phillips, MT; Valley, MT |
| Effective: | 2026-08-23 @ 7:41 pm -> 2026-08-23 @ 8:00 pm |
| Onset: | 2026-08-23 @ 7:41 pm -> 2026-08-23 @ 8:00 pm |
| Severity: | Severe |
| Certainty: | Observed |
| Urgency: | Immediate |
| Issued By: | NWS Glasgow MT on 2026-08-23 @ 7:41 pm |
| Headline: | Severe Thunderstorm Warning issued August 23 at 6:41PM MDT until August 23 at 7:00PM MDT by NWS Glasgow MT |
| Description: |
At 641 PM MDT, a severe thunderstorm was located 21 miles north of Hinsdale, or 28 miles west of Opheim, moving east at 45 mph. HAZARD...70 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect considerable tree damage. Wind damage is also likely to mobile homes, roofs, and outbuildings. Locations impacted include... Saco, Tampico, Hinsdale, Vandalia, Thoeny, Sleeping Buffalo, and Frenchman Reservoir. |
| Alert: | Severe Thunderstorm Warning |
| Area(s): | Valley, MT |
| Effective: | 2026-08-23 @ 7:40 pm -> 2026-08-23 @ 8:30 pm |
| Onset: | 2026-08-23 @ 7:40 pm -> 2026-08-23 @ 8:30 pm |
| Severity: | Severe |
| Certainty: | Observed |
| Urgency: | Immediate |
| Issued By: | NWS Glasgow MT on 2026-08-23 @ 7:40 pm |
| Headline: | Severe Thunderstorm Warning issued August 23 at 6:40PM MDT until August 23 at 7:30PM MDT by NWS Glasgow MT |
| Description: |
SVRGGW The National Weather Service in Glasgow has issued a * Severe Thunderstorm Warning for... West central Valley County in northeastern Montana... * Until 730 PM MDT. * At 639 PM MDT, a severe thunderstorm was located over Hinsdale, or 22 miles northwest of Glasgow, moving east at 55 mph. THIS IS A DESTRUCTIVE STORM FOR HINSDALE, TAMPICO, SAINT MARIE. HAZARD...80 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Flying debris will be dangerous to those caught without shelter. Mobile homes will be heavily damaged. Expect considerable damage to roofs, windows, and vehicles. Extensive tree damage and power outages are likely. * Locations impacted include... Tampico, St. Marie, Hinsdale, Vandalia, and Baylor. |
| Alert: | Special Weather Statement |
| Area(s): | Musselshell; Northeastern Yellowstone |
| Effective: | 2026-08-23 @ 7:29 pm -> 2026-08-23 @ 8:00 pm |
| Onset: | 2026-08-23 @ 7:29 pm |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-08-23 @ 7:29 pm |
| Headline: | Special Weather Statement issued August 23 at 6:29PM MDT by NWS Billings MT |
| Description: |
At 629 PM MDT, Doppler radar was tracking a strong thunderstorm 14 miles north of Worden, or 26 miles southeast of Roundup, moving east at 40 mph. HAZARD...Wind gusts up to 50 mph and half inch size 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... Mainly rural areas of Southeastern Musselshell and Northeastern Yellowstone Counties. |
| Alert: | Special Weather Statement |
| Area(s): | Fergus County below 4500ft; Snowy and Judith Mountains |
| Effective: | 2026-08-23 @ 7:28 pm -> 2026-08-23 @ 8:15 pm |
| Onset: | 2026-08-23 @ 7:28 pm |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-08-23 @ 7:28 pm |
| Headline: | Special Weather Statement issued August 23 at 6:28PM MDT by NWS Great Falls MT |
| Description: |
At 628 PM MDT, Doppler radar was tracking a strong thunderstorm 11 miles west of Grass Range, or 18 miles east of Lewistown, moving east at 35 mph. HAZARD...Wind gusts up to 50 mph and penny size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Grass Range and Forestgrove. |
| Alert: | Special Weather Statement |
| Area(s): | Madison River Valley; Gallatin and Madison County Mountains and Centennial Mountains |
| Effective: | 2026-08-23 @ 6:43 pm -> 2026-08-23 @ 7:45 pm |
| Onset: | 2026-08-23 @ 6:43 pm |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-08-23 @ 6:43 pm |
| Headline: | Special Weather Statement issued August 23 at 5:43PM MDT by NWS Great Falls MT |
| Description: |
At 543 PM MDT, Doppler radar was tracking a strong thunderstorm 21 miles northwest of Henrys Lake, moving east at 35 mph. HAZARD...Wind gusts up to 50 mph and pea size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Yellowstone Village and Raynolds Pass. |
| Alert: | Severe Thunderstorm Watch |
| Area(s): | Blaine, MT; Fergus, MT; Gallatin, MT; Madison, MT |
| Effective: | 2026-08-23 @ 5:30 pm -> 2026-08-23 @ 8:00 pm |
| Onset: | 2026-08-23 @ 5:30 pm -> 2026-08-23 @ 8:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-08-23 @ 5:30 pm |
| Headline: | Severe Thunderstorm Watch issued August 23 at 4:30PM MDT until August 23 at 7:00PM MDT by NWS Great Falls MT |
| Description: |
SEVERE THUNDERSTORM WATCH 617 REMAINS VALID UNTIL 7 PM MDT THIS EVENING FOR THE FOLLOWING AREAS IN MONTANA THIS WATCH INCLUDES 4 COUNTIES IN CENTRAL MONTANA FERGUS IN NORTH CENTRAL MONTANA BLAINE IN SOUTHWEST MONTANA GALLATIN MADISON THIS INCLUDES THE CITIES OF BATTLE RIDGE PASS, BOZEMAN APT, BOZEMAN PASS, CHINOOK, CITY OF BOZEMAN, ENNIS, GRASS RANGE, HARLEM, HAYS, LEWISTOWN, LEWISTOWN DIVIDE, NORRIS HILL, RAYNOLDS PASS, TARGHEE PASS, TWIN BRIDGES, VIRGINIA CITY, WEST YELLOWSTONE, AND WINIFRED. |
| Alert: | Severe Thunderstorm Watch |
| Area(s): | Carbon, MT; Golden Valley, MT; Park, MT; Stillwater, MT; Sweet Grass, MT; Wheatland, MT |
| Effective: | 2026-08-23 @ 4:50 pm -> 2026-08-23 @ 8:00 pm |
| Onset: | 2026-08-23 @ 4:50 pm -> 2026-08-23 @ 8:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-08-23 @ 4:50 pm |
| Headline: | Severe Thunderstorm Watch issued August 23 at 3:50PM MDT until August 23 at 7:00PM MDT by NWS Billings MT |
| Description: |
SEVERE THUNDERSTORM WATCH 617 REMAINS VALID UNTIL 7 PM MDT THIS EVENING FOR THE FOLLOWING AREAS IN MONTANA THIS WATCH INCLUDES 6 COUNTIES IN CENTRAL MONTANA GOLDEN VALLEY WHEATLAND IN SOUTH CENTRAL MONTANA CARBON PARK STILLWATER SWEET GRASS THIS INCLUDES THE CITIES OF ABSAROKEE, BIG TIMBER, BRIDGER, COLUMBUS, HARLOWTON, JOLIET, LAVINA, LIVINGSTON, RED LODGE, AND RYEGATE. |
| Alert: | Severe Thunderstorm Watch |
| Area(s): | Big Horn, MT; Carter, MT; Custer, MT; Fallon, MT; Musselshell, MT; Powder River, MT; Rosebud, MT; Treasure, MT; Yellowstone, MT |
| Effective: | 2026-08-23 @ 4:50 pm -> 2026-08-23 @ 11:00 pm |
| Onset: | 2026-08-23 @ 4:50 pm -> 2026-08-23 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-08-23 @ 4:50 pm |
| Headline: | Severe Thunderstorm Watch issued August 23 at 3:50PM MDT until August 23 at 10:00PM MDT by NWS Billings MT |
| Description: |
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 620 IN EFFECT UNTIL 10 PM MDT THIS EVENING FOR THE FOLLOWING AREAS IN MONTANA THIS WATCH INCLUDES 9 COUNTIES IN CENTRAL MONTANA MUSSELSHELL IN SOUTH CENTRAL MONTANA BIG HORN YELLOWSTONE IN SOUTHEAST MONTANA CARTER CUSTER FALLON POWDER RIVER ROSEBUD TREASURE THIS INCLUDES THE CITIES OF ASHLAND, BAKER, BILLINGS, BROADUS, COLSTRIP, CROW AGENCY, EKALAKA, FORSYTH, HARDIN, HYSHAM, LAME DEER, MILES CITY, AND ROUNDUP. |
| Alert: | Severe Thunderstorm Watch |
| Area(s): | Daniels, MT; Dawson, MT; Garfield, MT; McCone, MT; Petroleum, MT; Phillips, MT; Prairie, MT; Richland, MT; Roosevelt, MT; Sheridan, MT; Valley, MT; Wibaux, MT |
| Effective: | 2026-08-23 @ 4:48 pm -> 2026-08-23 @ 11:00 pm |
| Onset: | 2026-08-23 @ 4:48 pm -> 2026-08-23 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Glasgow MT on 2026-08-23 @ 4:48 pm |
| Headline: | Severe Thunderstorm Watch issued August 23 at 3:48PM MDT until August 23 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 620 IN EFFECT UNTIL 10 PM MDT THIS EVENING FOR THE FOLLOWING AREAS IN MONTANA THIS WATCH INCLUDES 12 COUNTIES IN NORTHEAST MONTANA DANIELS DAWSON GARFIELD MCCONE PETROLEUM PHILLIPS PRAIRIE RICHLAND ROOSEVELT SHERIDAN VALLEY WIBAUX THIS INCLUDES THE CITIES OF CIRCLE, CULBERTSON, FAIRVIEW, FORT PECK, GLASGOW, GLENDIVE, JORDAN, MALTA, MEDICINE LAKE, OPHEIM, PLENTYWOOD, POPLAR, RICHEY, SACO, SCOBEY, SIDNEY, TERRY, WHITEWATER, WIBAUX, WINNETT, WOLF POINT, AND ZORTMAN. |
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-08-23 @ 1:34 pm -> 2026-08-24 @ 5:00 am |
| Onset: | 2026-08-24 @ 11:00 am -> 2026-08-24 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-23 @ 1:34 pm |
| Headline: | Lake Wind Advisory issued August 23 at 12:34PM MDT until August 24 at 9:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...West winds 15 to 25 mph with gusts up to 40 mph expected. * WHERE...Fort Peck Lake. * WHEN...From 10 AM to 9 PM MDT Monday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. * ADDITIONAL DETAILS...Wave heights 2 to 4 feet. |
| Alert: | Red Flag Warning |
| Area(s): | Deerlodge/Western Beaverhead National Forest |
| Effective: | 2026-08-22 @ 10:08 am -> 2026-08-23 @ 9:00 pm |
| Onset: | 2026-08-23 @ 2:00 pm -> 2026-08-23 @ 9:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-08-22 @ 10:08 am |
| Headline: | Red Flag Warning issued August 22 at 9:08AM MDT until August 23 at 8:00PM MDT by NWS Missoula MT |
| Description: |
...FIRE WEATHER WATCH IS CANCELLED FOR FLATHEAD RESERVATION AND EAST BEAVERHEAD... ...RED FLAG WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 6 AM MDT SUNDAY DUE TO LIGHTNING FOR KOOTENAI AND WEST LOLO... ...RED FLAG WARNING IN EFFECT FROM 1 PM TO 8 PM MDT SUNDAY DUE TO WIND AND LOW RELATIVE HUMIDITY FOR DEERLODGE/WEST BEAVERHEAD... ... .Antecedent conditions have been very dry and warm. The Kootenai Forest especially has received well below normal precipitation since early July. Thunderstorms with little to no precipitation Saturday evening and overnight will be followed Sunday with a dry cold front. Increased winds and lowering relative humidities behind the front on Sunday will bring critical fire weather conditions to southwest Montana across Fire Weather Zone 110. The National Weather Service in Missoula MT has issued a Red Flag Warning in effect from 1 PM to 8 PM MDT Sunday. * AFFECTED AREA...Fire Weather Zone 110. * TIMING...From 1 PM to 8 PM MDT Sunday. * WINDS...Southwest winds 15 to 20 mph with gusts of 25 to 40 mph. * RELATIVE HUMIDITY...Relative Humidity between 15 to 25 percent. * IMPACTS...Any fires that develop will spread rapidly. Outdoor burning is not recommended. |
| Alert: | Fire Weather Watch |
| Area(s): | Eastern Beaverhead National Forest |
| Effective: | 2026-08-22 @ 10:08 am -> 2026-08-22 @ 10:24 am |
| Onset: | 2026-08-23 @ 1:00 pm -> 2026-08-23 @ 10:00 pm |
| Severity: | Minor |
| Certainty: | Observed |
| Urgency: | Past |
| Issued By: | NWS Missoula MT on 2026-08-22 @ 10:08 am |
| Headline: | The Fire Weather Watch has been cancelled. |
| Description: |
The Fire Weather Watch has been cancelled and is no longer in effect. |
| Alert: | Fire Weather Watch |
| Area(s): | Deerlodge/Western Beaverhead National Forest |
| Effective: | 2026-08-22 @ 10:08 am -> 2026-08-22 @ 10:24 am |
| Onset: | 2026-08-23 @ 1:00 pm -> 2026-08-23 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Observed |
| Urgency: | Past |
| Issued By: | NWS Missoula MT on 2026-08-22 @ 10:08 am |
| Headline: | The Fire Weather Watch has been replaced. Please see the latest information from NWS Missoula MT on this developing situation. |
| Description: |
The Fire Weather Watch has been replaced. Please see the latest information from NWS Missoula MT on this developing situation. |