Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Severe Thunderstorm Warning
Area(s): Cascade, MT; Chouteau, MT; Hill, MT; Judith Basin, MT; Liberty, MT; Pondera, MT; Teton, MT; Toole, MT
Effective: 2026-09-02 @ 4:22 pm -> 2026-09-02 @ 5:15 pm
Onset: 2026-09-02 @ 4:22 pm -> 2026-09-02 @ 5:15 pm
Severity: Severe
Certainty: Observed
Urgency: Immediate
Issued By: NWS Great Falls MT on 2026-09-02 @ 4:22 pm
Headline: Severe Thunderstorm Warning issued September 2 at 3:22PM MDT until September 2 at 4:15PM MDT by NWS Great Falls MT
Description: SVRTFX

The National Weather Service in Great Falls has issued a

* Severe Thunderstorm Warning for...
Eastern Pondera County in north central Montana...
Northwestern Judith Basin County in central Montana...
Southern Liberty County in north central Montana...
Southeastern Toole County in north central Montana...
Northeastern Teton County in north central Montana...
Southwestern Hill County in north central Montana...
Chouteau County in north central Montana...
Eastern Cascade County in central Montana...

* Until 415 PM MDT.

* At 322 PM MDT, severe thunderstorms were located along a line
extending from 10 miles south of Valier to near Dutton to 22 miles
southeast of Cascade, moving northeast at 75 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.

* Locations impacted include...
Great Falls, Conrad, Fort Benton, Chester, Big Sandy, Stanford,
Belt, Geraldine, Lothair, Brady, The Knees, Highwood, Black Eagle,
Geyser, Carter, Floweree, Windham, Tiber Dam, Eden, and Stockett.

Alert: Special Weather Statement
Area(s): Kootenai/Cabinet Region; West Glacier Region
Effective: 2026-09-02 @ 4:19 pm -> 2026-09-02 @ 5:00 pm
Onset: 2026-09-02 @ 4:19 pm
Severity: Moderate
Certainty: Observed
Urgency: Expected
Issued By: NWS Missoula MT on 2026-09-02 @ 4:19 pm
Headline: Special Weather Statement issued September 2 at 3:19PM MDT by NWS Missoula MT
Description: At 319 PM MDT, Doppler radar was tracking a line of strong
thunderstorms extending from 15 miles southeast of Eureka to 25 miles
southeast of West Glacier, or extending from 37 miles northeast of
Libby to 37 miles east of Evergreen, moving north at 25 mph.

HAZARD...Wind gusts 30 to 40 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...
Eureka, West Glacier, Rexford, Polebridge, Trailcreek, Olney,
Radnor, Apgar, Stryker, Coram, Lake McDonald, Trego, Fortine,
Nyack, Pinnacle and Blacktail.

Alert: Severe Thunderstorm Warning
Area(s): Broadwater, MT; Lewis and Clark, MT; Meagher, MT
Effective: 2026-09-02 @ 4:15 pm -> 2026-09-02 @ 5:15 pm
Onset: 2026-09-02 @ 4:15 pm -> 2026-09-02 @ 5:15 pm
Severity: Severe
Certainty: Observed
Urgency: Immediate
Issued By: NWS Great Falls MT on 2026-09-02 @ 4:15 pm
Headline: Severe Thunderstorm Warning issued September 2 at 3:15PM MDT until September 2 at 4:15PM MDT by NWS Great Falls MT
Description: SVRTFX

The National Weather Service in Great Falls has issued a

* Severe Thunderstorm Warning for...
Southeastern Lewis and Clark County in west central Montana...
Meagher County in central Montana...
Broadwater County in southwestern Montana...

* Until 415 PM MDT.

* At 315 PM MDT, severe thunderstorms were located along a line
extending from 16 miles northeast of East Helena to 9 miles
northeast of Townsend, moving east at 40 mph.

HAZARD...70 mph wind gusts.

SOURCE...70 mph wind gusts in the Helena area.

IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.

* Locations impacted include...
Helena, Townsend, White Sulphur Springs, East Helena, Toston, Fort
Logan On The Smith River, York, Ringling, Martinsdale, Fort Logan,
Newlan Creek Reservoir, Winston, Radersburg, Lennep, Silos, Black
Sandy State Park, Checkerboard, and Goose Bay.

Alert: Special Weather Statement
Area(s): Western and Central Chouteau County; Bears Paw Mountains and Southern Blaine
Effective: 2026-09-02 @ 4:06 pm -> 2026-09-02 @ 4:45 pm
Onset: 2026-09-02 @ 4:06 pm
Severity: Moderate
Certainty: Observed
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-09-02 @ 4:06 pm
Headline: Special Weather Statement issued September 2 at 3:06PM MDT by NWS Great Falls MT
Description: At 306 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 11 miles northwest of Highwood to 8 miles
southeast of Fort Benton to near Geraldine. Movement was northeast at
35 mph.

HAZARD...Wind gusts up to 50 mph and half inch 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...
Fort Benton, Geraldine, Carter, Loma, Virgelle, and Kenilworth.

Alert: Severe Thunderstorm Warning
Area(s): Cascade, MT; Lewis and Clark, MT; Teton, MT
Effective: 2026-09-02 @ 3:57 pm -> 2026-09-02 @ 5:00 pm
Onset: 2026-09-02 @ 3:57 pm -> 2026-09-02 @ 5:00 pm
Severity: Severe
Certainty: Observed
Urgency: Immediate
Issued By: NWS Great Falls MT on 2026-09-02 @ 3:57 pm
Headline: Severe Thunderstorm Warning issued September 2 at 2:57PM MDT until September 2 at 4:00PM MDT by NWS Great Falls MT
Description: SVRTFX

The National Weather Service in Great Falls has issued a

* Severe Thunderstorm Warning for...
Central Lewis and Clark County in west central Montana...
Teton County in north central Montana...
Western Cascade County in central Montana...

* Until 400 PM MDT.

* At 256 PM MDT, severe thunderstorms were located along a line
extending from 33 miles west of Choteau to 8 miles east of Augusta
to 12 miles southwest of Fairfield to 13 miles north of East
Helena, moving northeast at 35 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.

* Locations impacted include...
Choteau, Cascade, Fairfield, Dutton, Fort Shaw, Power, Pishkun
Reservoir, Vaughn, First Peoples Buffalo Jump State Park, Sun
River, Tower Rock State Park, Collins, Bynum, Craig, Ulm, Pendroy,
Black Sandy State Park, Farmington, and Simms.

Alert: High Wind Warning
Area(s): Madison River Valley
Effective: 2026-09-02 @ 3:43 pm -> 2026-09-02 @ 10:00 pm
Onset: 2026-09-02 @ 3:43 pm -> 2026-09-02 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-09-02 @ 3:43 pm
Headline: High Wind Warning issued September 2 at 2:43PM MDT until September 2 at 9:00PM MDT by NWS Great Falls MT
Description: * WHAT...For the High Wind Warning on Wednesday, southwest winds 35
to 45 mph with gusts up to 60 mph expected.

* WHERE...Madison River Valley.

* WHEN...Until 9 PM MDT this evening.

* IMPACTS...Damaging winds may cause damage to trees and power lines.
Travel will be difficult, especially for high profile vehicles.

Alert: Severe Thunderstorm Watch
Area(s): Blaine, MT; Broadwater, MT; Cascade, MT; Chouteau, MT; Fergus, MT; Glacier, MT; Hill, MT; Jefferson, MT; Judith Basin, MT; Lewis and Clark, MT; Liberty, MT; Meagher, MT; Pondera, MT; Teton, MT; Toole, MT
Effective: 2026-09-02 @ 2:36 pm -> 2026-09-02 @ 9:00 pm
Onset: 2026-09-02 @ 2:36 pm -> 2026-09-02 @ 9:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-09-02 @ 2:36 pm
Headline: Severe Thunderstorm Watch issued September 2 at 1:36PM MDT until September 2 at 8:00PM MDT by NWS Great Falls MT
Description: THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
644 IN EFFECT UNTIL 8 PM MDT THIS EVENING FOR THE FOLLOWING AREAS

IN MONTANA THIS WATCH INCLUDES 15 COUNTIES

IN CENTRAL MONTANA

CASCADE FERGUS JUDITH BASIN
MEAGHER

IN NORTH CENTRAL MONTANA

BLAINE CHOUTEAU GLACIER
HILL LIBERTY PONDERA
TETON TOOLE

IN SOUTHWEST MONTANA

BROADWATER JEFFERSON

IN WEST CENTRAL MONTANA

LEWIS AND CLARK

THIS INCLUDES THE CITIES OF AUGUSTA, BELT, BIG SANDY, BOULDER,
BOULDER HILL, BRADY, BROWNING, BYNUM, CARTER, CASCADE, CHESTER,
CHINOOK, CHOTEAU, CONRAD, CUT BANK, DEEP CREEK PASS, DUTTON,
ELK PARK PASS, FAIRFIELD, FLESHER PASS, FORT BENTON, GRASS RANGE,
GREAT FALLS, HARLEM, HAVRE, HAYS, HEART BUTTE, HELENA, HOBSON,
HOMESTAKE PASS, KINGS HILL PASS, LEWISTOWN, LEWISTOWN DIVIDE,
LINCOLN, LOGAN PASS, MACDONALD PASS, MARIAS PASS, MARTINSDALE,
MONTANA CITY, RAYNESFORD, ROCKY BOY, ROGERS PASS, RUDYARD,
SHELBY, STANFORD, SUNBURST, TOSTON, TOWNSEND,
WHITE SULPHUR SPRINGS, WHITEHALL, WHITLASH, WINIFRED,
AND WINSTON.

Alert: Red Flag Warning
Area(s): Crow Indian Reservation/Big Horn Canyon Rec Area; Bighorn National Forest
Effective: 2026-09-02 @ 1:10 pm -> 2026-09-03 @ 1:15 pm
Onset: 2026-09-03 @ 1:00 pm -> 2026-09-03 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-09-02 @ 1:10 pm
Headline: Red Flag Warning issued September 2 at 12:10PM MDT until September 3 at 9:00PM MDT by NWS Billings MT
Description: The National Weather Service in Billings has issued a Red Flag
Warning...which is in effect from noon to 9 PM MDT Thursday.

* IMPACTS: Low humidities and strong gusty winds will create
erratic fire behavior.

* AFFECTED AREA:
In North Central WY Fire Zone...284.
In South Central MT Fire Zone...129.

* COUNTIES AFFECTED:
In North Central WY...Big Horn...Johnson...Sheridan...Washakie.
In South Central MT...Big Horn...Carbon...Yellowstone.

* WIND: South 10 to 15 mph with gusts up to 35 mph.

* HUMIDITY: As low as 12 percent.

* ADDITIONAL DETAILS: The strongest winds, and area of greatest
concern, in MTZ129 are forecast in the western portion of the
zone.

Alert: Red Flag Warning
Area(s): Gallatin National Forest; Wheatland County/Sweet Grass County; Stillwater County; Beartooth Ranger District Custer National Forest; Golden Valley County/Musselshell County; Yellowstone County
Effective: 2026-09-02 @ 1:10 pm -> 2026-09-03 @ 1:15 pm
Onset: 2026-09-03 @ 1:00 pm -> 2026-09-03 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-09-02 @ 1:10 pm
Headline: Red Flag Warning issued September 2 at 12:10PM MDT until September 3 at 9:00PM MDT by NWS Billings MT
Description: The National Weather Service in Billings has issued a Red Flag
Warning...which is in effect from noon to 9 PM MDT Thursday. The
Fire Weather Watch is no longer in effect.

* IMPACTS: Low humidities and strong gusty winds will create
erratic fire behavior.

* AFFECTED AREA:
In South Central MT Fire Zones...123...124...125...126...127
128.

* COUNTIES AFFECTED:
In Central MT...Golden Valley...Musselshell...Wheatland.
In South Central MT...Carbon...Park...Stillwater...Sweet Grass
Yellowstone.
In Southwest MT...Gallatin.

* WIND: Southwest 10 to 20 mph with gusts up to 40 mph. The
strongest winds are forecast in the mountain foothills.

* HUMIDITY: As low as 15 percent.

* ADDITIONAL DETAILS: For MTZ123 and MTZ126, the worst conditions
are expected across the lower elevations.

Alert: Red Flag Warning
Area(s): Eastern Beaverhead National Forest
Effective: 2026-09-01 @ 11:22 am -> 2026-09-03 @ 9:00 pm
Onset: 2026-09-02 @ 1:00 pm -> 2026-09-03 @ 9:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-09-01 @ 11:22 am
Headline: Red Flag Warning issued September 1 at 10:22AM MDT until September 3 at 8:00PM MDT by NWS Missoula MT
Description: ...RED FLAG WARNING IN EFFECT FROM NOON WEDNESDAY TO 8 PM MDT
THURSDAY DUE TO WIND AND LOW RELATIVE HUMIDITY FOR EAST BEAVERHEAD...

.Strong southwest winds will develop Wednesday as a cold front tracks
eastward and stalls along the Continental Divide. Winds will peak
each afternoon and early evening. Winds will remain elevated
Wednesday night, especially across midslopes and ridgetops, with poor
humidity recoveries.

The National Weather Service in Missoula MT has issued a Red Flag
Warning in effect from noon Wednesday to 8 PM MDT Thursday.

* AFFECTED AREA...Fire Weather Zone 111.

* TIMING...From noon Wednesday to 8 PM MDT Thursday.

* WINDS...Southwest winds 30 to 40 mph with gusts up to 50 mph.

* RELATIVE HUMIDITY...Relative Humidity between 20 to 30 percent.

* IMPACTS...Any fires that develop will spread rapidly. Outdoor
burning is not recommended.