Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Special Weather Statement
Area(s): Musselshell; Northern Big Horn; Southern Big Horn; Southeastern Carbon; Bighorn Canyon; Pryor/Northern Bighorn Mountains; Northeastern Yellowstone; Southwestern Yellowstone
Effective: 2026-07-18 @ 9:19 pm -> 2026-07-18 @ 10:15 pm
Onset: 2026-07-18 @ 9:19 pm
Severity: Moderate
Certainty: Observed
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-18 @ 9:19 pm
Headline: Special Weather Statement issued July 18 at 8:19PM MDT by NWS Billings MT
Description: At 819 PM MDT, Doppler radar was tracking an area of strong
thunderstorms extending from 16 miles north of Shepherd to 7 miles
southeast of Pryor, or extending from 21 miles south of Roundup to 32
miles south of Billings, moving east at 30 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...
Ballantine, Worden, Huntley, Shepherd, Lockwood, Fort Smith, Pryor,
Pompeys Pillar, Bighorn Lake, St. Xavier and Crow Indian
Reservation.

This does NOT include Billings.

Alert: Special Weather Statement
Area(s): Livingston Area; Beartooth Foothills; Northern Sweet Grass
Effective: 2026-07-18 @ 9:08 pm -> 2026-07-18 @ 9:45 pm
Onset: 2026-07-18 @ 9:08 pm
Severity: Moderate
Certainty: Observed
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-18 @ 9:08 pm
Headline: Special Weather Statement issued July 18 at 8:08PM MDT by NWS Billings MT
Description: At 808 PM MDT, Doppler radar was tracking a shower near Livingston,
moving east at 35 mph.

HAZARD...Wind gusts of 50 to 60 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.

Locations impacted include...
Livingston, Big Timber, Springdale, Mc Leod and Greycliff.

Alert: Special Weather Statement
Area(s): Hill County; Western and Central Chouteau County; Bears Paw Mountains and Southern Blaine
Effective: 2026-07-18 @ 9:00 pm -> 2026-07-18 @ 9:45 pm
Onset: 2026-07-18 @ 9:00 pm
Severity: Moderate
Certainty: Observed
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-18 @ 9:00 pm
Headline: Special Weather Statement issued July 18 at 8:00PM MDT by NWS Great Falls MT
Description: At 759 PM MDT, Doppler radar was tracking a strong thunderstorm near
Box Elder, or 8 miles north of Big Sandy, moving northeast at 30 mph.

HAZARD...Wind gusts up to 40 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...
Big Sandy, Azure, Parker School, Beaver Creek, Agency, Sangrey, St.
Pierre, Boneau, Box Elder, Rocky Boy, and Laredo.

Alert: Special Weather Statement
Area(s): Big Belt, Bridger and Castle Mountains; Meagher County Valleys; Canyon Ferry Area; Gallatin Valley; Gallatin and Madison County Mountains and Centennial Mountains
Effective: 2026-07-18 @ 8:53 pm -> 2026-07-18 @ 10:00 pm
Onset: 2026-07-18 @ 8:53 pm
Severity: Moderate
Certainty: Observed
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-18 @ 8:53 pm
Headline: Special Weather Statement issued July 18 at 7:53PM MDT by NWS Great Falls MT
Description: At 752 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Townsend to 15 miles south of Bozeman.
Movement was east at 35 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...
Bozeman, Townsend, Belgrade, Manhattan, Toston, Bozeman Hot Springs,
Ringling, Gallatin Gateway, Maudlow, Four Corners, Silos, Menard, and
Church Hill.

Alert: Flood Advisory
Area(s): Liberty, MT; Pondera, MT; Toole, MT
Effective: 2026-07-18 @ 6:44 pm -> 2026-07-18 @ 9:45 pm
Onset: 2026-07-18 @ 6:44 pm -> 2026-07-18 @ 9:45 pm
Severity: Minor
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-18 @ 6:44 pm
Headline: Flood Advisory issued July 18 at 5:44PM MDT until July 18 at 8:45PM MDT by NWS Great Falls MT
Description: * WHAT...Flooding caused by excessive rainfall is expected.

* WHERE...Southwestern Liberty County in north central Montana...
Northeastern Pondera County in north central Montana...
Southeastern Toole County in north central Montana...

* WHEN...Until 845 PM MDT.

* IMPACTS...Minor flooding in low-lying and poor drainage areas.

* ADDITIONAL DETAILS...
- At 544 PM MDT, Doppler radar and automated rain gauges indicated
heavy rain due to thunderstorms. Minor flooding is ongoing or
expected to begin shortly in the advisory area. Up to 1 inch of
rain has fallen.
- Additional rainfall amounts up to 0.5 inches are expected over
the area. This additional rain will result in minor flooding.
- Some locations that will experience flooding include...
Conrad, Lothair, Ledger, Devon and Galata.
- http://www.weather.gov/safety/flood

Alert: Severe Thunderstorm Watch
Area(s): Blaine, MT; Hill, MT; Liberty, MT
Effective: 2026-07-18 @ 6:37 pm -> 2026-07-18 @ 11:00 pm
Onset: 2026-07-18 @ 6:37 pm -> 2026-07-18 @ 11:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-07-18 @ 6:37 pm
Headline: Severe Thunderstorm Watch issued July 18 at 5:37PM MDT until July 18 at 10:00PM MDT by NWS Great Falls MT
Description: THE NATIONAL WEATHER SERVICE HAS EXTENDED SEVERE THUNDERSTORM
WATCH 497 TO INCLUDE THE FOLLOWING AREAS UNTIL 10 PM MDT THIS
EVENING

IN MONTANA THIS WATCH INCLUDES 3 COUNTIES

IN NORTH CENTRAL MONTANA

BLAINE HILL LIBERTY

THIS INCLUDES THE CITIES OF CHESTER, CHINOOK, HARLEM, HAVRE,
HAYS, ROCKY BOY, RUDYARD, AND WHITLASH.

Alert: Severe Thunderstorm Watch
Area(s): Broadwater, MT; Cascade, MT; Chouteau, MT; Fergus, MT; Gallatin, MT; Jefferson, MT; Judith Basin, MT; Lewis and Clark, MT; Madison, MT; Meagher, MT; Pondera, MT; Teton, MT
Effective: 2026-07-18 @ 6:37 pm -> 2026-07-18 @ 11:00 pm
Onset: 2026-07-18 @ 6:37 pm -> 2026-07-18 @ 11:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-07-18 @ 6:37 pm
Headline: Severe Thunderstorm Watch issued July 18 at 5:37PM MDT until July 18 at 10:00PM MDT by NWS Great Falls MT
Description: SEVERE THUNDERSTORM WATCH 497 REMAINS VALID UNTIL 10 PM MDT THIS
EVENING FOR THE FOLLOWING AREAS

IN MONTANA THIS WATCH INCLUDES 12 COUNTIES

IN CENTRAL MONTANA

CASCADE FERGUS JUDITH BASIN
MEAGHER

IN NORTH CENTRAL MONTANA

CHOUTEAU PONDERA TETON

IN SOUTHWEST MONTANA

BROADWATER GALLATIN JEFFERSON
MADISON

IN WEST CENTRAL MONTANA

LEWIS AND CLARK

THIS INCLUDES THE CITIES OF AUGUSTA, BATTLE RIDGE PASS, BELT,
BIG SANDY, BOULDER, BOULDER HILL, BOZEMAN APT, BOZEMAN PASS,
BRADY, BYNUM, CARTER, CASCADE, CHOTEAU, CITY OF BOZEMAN, CONRAD,
DEEP CREEK PASS, DUTTON, ELK PARK PASS, ENNIS, FAIRFIELD,
FLESHER PASS, FORT BENTON, GRASS RANGE, GREAT FALLS, HEART BUTTE,
HELENA, HOBSON, HOMESTAKE PASS, KINGS HILL PASS, LEWISTOWN,
LEWISTOWN DIVIDE, LINCOLN, MACDONALD PASS, MARTINSDALE,
MONTANA CITY, NORRIS HILL, RAYNESFORD, RAYNOLDS PASS,
ROGERS PASS, STANFORD, TARGHEE PASS, TOSTON, TOWNSEND,
TWIN BRIDGES, VIRGINIA CITY, WEST YELLOWSTONE,
WHITE SULPHUR SPRINGS, WHITEHALL, WINIFRED, AND WINSTON.

Alert: Severe Thunderstorm Watch
Area(s): Park, MT; Sweet Grass, MT; Wheatland, MT
Effective: 2026-07-18 @ 4:46 pm -> 2026-07-18 @ 11:00 pm
Onset: 2026-07-18 @ 4:46 pm -> 2026-07-18 @ 11:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Billings MT on 2026-07-18 @ 4:46 pm
Headline: Severe Thunderstorm Watch issued July 18 at 3:46PM MDT until July 18 at 10:00PM MDT by NWS Billings MT
Description: THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
497 IN EFFECT UNTIL 10 PM MDT THIS EVENING FOR THE FOLLOWING
AREAS

IN MONTANA THIS WATCH INCLUDES 3 COUNTIES

IN CENTRAL MONTANA

WHEATLAND

IN SOUTH CENTRAL MONTANA

PARK SWEET GRASS

THIS INCLUDES THE CITIES OF BIG TIMBER, HARLOWTON,
AND LIVINGSTON.