Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Flood Advisory
Area(s): Musselshell, MT; Yellowstone, MT
Effective: 2026-07-15 @ 12:35 am -> 2026-07-15 @ 2:00 am
Onset: 2026-07-15 @ 12:35 am -> 2026-07-15 @ 2:00 am
Severity: Minor
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-15 @ 12:35 am
Headline: Flood Advisory issued July 14 at 11:35PM MDT until July 15 at 1:00AM MDT by NWS Billings MT
Description: Thunderstorms produced very heavy rain earlier this evening, and may
result in localized flooding.

* WHAT...Flooding caused by excessive rainfall continues.

* WHERE...South Central Musselshell County in central Montana...
North Central Yellowstone County in south central Montana...

* WHEN...Until 100 AM MDT.

* IMPACTS...Minor flooding in low-lying and poor drainage areas.
Rises in small streams and normally dry arroyos.

* ADDITIONAL DETAILS...
- At 1132 PM MDT, Doppler radar indicated heavy rain due to
thunderstorms. Minor flooding is ongoing or expected to begin
shortly in the advisory area. Between 1 and 3 inches of rain has
fallen. Additional rainfall should be a half inch or less.
- Some locations that will experience flooding include...
Mainly rural areas of South Central Musselshell and North Central
Yellowstone Counties, in and near the Bull Mountains.
- http://www.weather.gov/safety/flood

Alert: Flood Watch
Area(s): Southern High Plains; Western and Central Chouteau County; Bears Paw Mountains and Southern Blaine; Cascade County below 5000ft; Judith Basin County and Judith Gap; Fergus County below 4500ft; Upper Blackfoot and MacDonald Pass; Gates of the Mountains; Little Belt and Highwood Mountains; Snowy and Judith Mountains; Helena Valley; Big Belt, Bridger and Castle Mountains; Meagher County Valleys; Elkhorn and Boulder Mountains; Canyon Ferry Area; Missouri Headwaters; Gallatin Valley
Effective: 2026-07-15 @ 12:33 am -> 2026-07-15 @ 1:45 am
Onset: 2026-07-15 @ 12:33 am -> 2026-07-15 @ 1:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-07-15 @ 12:33 am
Headline: Flood Watch issued July 14 at 11:33PM MDT until July 15 at 12:00AM MDT by NWS Great Falls MT
Description: The Flood Watch will expire for portions of central, north central,
and southwest Montana.

The flash flooding threat has ended. Therefore, the Flood Watch will
expire at midnight MDT tonight.

Alert: Severe Thunderstorm Warning
Area(s): Big Horn, MT; Treasure, MT; Yellowstone, MT
Effective: 2026-07-15 @ 12:31 am -> 2026-07-15 @ 1:30 am
Onset: 2026-07-15 @ 12:31 am -> 2026-07-15 @ 1:30 am
Severity: Severe
Certainty: Observed
Urgency: Immediate
Issued By: NWS Billings MT on 2026-07-15 @ 12:31 am
Headline: Severe Thunderstorm Warning issued July 14 at 11:31PM MDT until July 15 at 12:30AM MDT by NWS Billings MT
Description: SVRBYZ

The National Weather Service in Billings has issued a

* Severe Thunderstorm Warning for...
North Central Big Horn County in south central Montana...
East Central Yellowstone County in south central Montana...
Central Treasure County in southeastern Montana...

* Until 1230 AM MDT.

* At 1131 PM MDT, a severe thunderstorm was located 14 miles
southwest of Custer, or 17 miles north of Hardin, moving northeast
at 30 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.

* Locations impacted include...
Custer, Bighorn and Pompeys Pillar.

Alert: Severe Thunderstorm Warning
Area(s): Garfield, MT
Effective: 2026-07-15 @ 12:30 am -> 2026-07-15 @ 1:00 am
Onset: 2026-07-15 @ 12:30 am -> 2026-07-15 @ 1:00 am
Severity: Severe
Certainty: Observed
Urgency: Immediate
Issued By: NWS Glasgow MT on 2026-07-15 @ 12:30 am
Headline: Severe Thunderstorm Warning issued July 14 at 11:30PM MDT until July 15 at 12:00AM MDT by NWS Glasgow MT
Description: At 1130 PM MDT, severe thunderstorms were located along a line
extending from 10 miles southeast of Devils Creek Rec Area to 10
miles southwest of Jordan to 20 miles southeast of Edwards, moving
east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Jordan, Sand Springs, Hell Creek Rec Area, Edwards, Brusett, and
Steve Fork.

Alert: Special Weather Statement
Area(s): Musselshell; Treasure; Northern Rosebud; Northern Big Horn; Northeastern Yellowstone
Effective: 2026-07-15 @ 12:23 am -> 2026-07-15 @ 1:30 am
Onset: 2026-07-15 @ 12:23 am
Severity: Moderate
Certainty: Observed
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-15 @ 12:23 am
Headline: Special Weather Statement issued July 14 at 11:23PM MDT by NWS Billings MT
Description: At 1123 PM MDT, Doppler radar was tracking a line of strong
thunderstorms extending from 39 miles north of Hysham to 24 miles
north of Busby, or extending from 39 miles north of Hysham to 24
miles west of Colstrip, moving east at 20 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...
Hardin, Forsyth, Hysham, Custer, Melstone, Bighorn, Ingomar,
Vananda, Pompeys Pillar and Northern Cheyenne Indian Reservation.

Alert: Extreme Heat Warning
Area(s): Custer; Fallon; Powder River; Carter
Effective: 2026-07-15 @ 12:01 am -> 2026-07-16 @ 12:15 am
Onset: 2026-07-15 @ 12:01 am -> 2026-07-16 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-15 @ 12:01 am
Headline: Extreme Heat Warning issued July 14 at 11:01PM MDT until July 16 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Very hot conditions with high temperatures of 98 to 103
degrees on Wednesday.

* WHERE...Carter, Custer, Fallon, and Powder River.

* WHEN...Until midnight MDT Wednesday Night.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.

* ADDITIONAL DETAILS...Very warm nighttime temperatures will provide
only limited relief.

Alert: Severe Thunderstorm Watch
Area(s): Musselshell, MT; Rosebud, MT; Treasure, MT
Effective: 2026-07-14 @ 11:16 pm -> 2026-07-15 @ 2:00 am
Onset: 2026-07-14 @ 11:16 pm -> 2026-07-15 @ 2:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Billings MT on 2026-07-14 @ 11:16 pm
Headline: Severe Thunderstorm Watch issued July 14 at 10:16PM MDT until July 15 at 1:00AM MDT by NWS Billings MT
Description: SEVERE THUNDERSTORM WATCH 488 REMAINS VALID UNTIL 1 AM MDT
WEDNESDAY FOR THE FOLLOWING AREAS

IN MONTANA THIS WATCH INCLUDES 3 COUNTIES

IN CENTRAL MONTANA

MUSSELSHELL

IN SOUTHEAST MONTANA

ROSEBUD TREASURE

THIS INCLUDES THE CITIES OF ASHLAND, COLSTRIP, FORSYTH, HYSHAM,
LAME DEER, AND ROUNDUP.

Alert: Flash Flood Warning
Area(s): Petroleum, MT
Effective: 2026-07-14 @ 10:33 pm -> 2026-07-15 @ 1:30 am
Onset: 2026-07-14 @ 10:33 pm -> 2026-07-15 @ 1:30 am
Severity: Severe
Certainty: Likely
Urgency: Immediate
Issued By: NWS Glasgow MT on 2026-07-14 @ 10:33 pm
Headline: Flash Flood Warning issued July 14 at 9:33PM MDT until July 15 at 12:30AM MDT by NWS Glasgow MT
Description: FFWGGW

The National Weather Service in Glasgow has issued a

* Flash Flood Warning for...
Southwestern Petroleum County in northeastern Montana...

* Until 1230 AM MDT.

* At 933 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to 2 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar indicated.

IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.

* Some locations that will experience flash flooding include...
Winnett, Flatwillow, Tiegen and Petrolia Lake.

US 87 in the southwest corner of Petroleum County including where it
crosses Flatwillow Creek is expected to have flash flooding.

Alert: Severe Thunderstorm Watch
Area(s): Garfield, MT; McCone, MT; Petroleum, MT; Phillips, MT; Prairie, MT; Valley, MT
Effective: 2026-07-14 @ 6:45 pm -> 2026-07-15 @ 2:00 am
Onset: 2026-07-14 @ 6:45 pm -> 2026-07-15 @ 2:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Glasgow MT on 2026-07-14 @ 6:45 pm
Headline: Severe Thunderstorm Watch issued July 14 at 5:45PM MDT until July 15 at 1:00AM MDT by NWS Glasgow MT
Description: THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
488 IN EFFECT UNTIL 1 AM MDT WEDNESDAY FOR THE FOLLOWING AREAS

IN MONTANA THIS WATCH INCLUDES 6 COUNTIES

IN NORTHEAST MONTANA

GARFIELD MCCONE PETROLEUM
PHILLIPS PRAIRIE VALLEY

THIS INCLUDES THE CITIES OF CIRCLE, FORT PECK, GLASGOW, JORDAN,
MALTA, OPHEIM, SACO, TERRY, WHITEWATER, WINNETT, AND ZORTMAN.

Alert: Flood Watch
Area(s): Judith Gap; Crazy Mountains; Southern Wheatland
Effective: 2026-07-14 @ 3:06 pm -> 2026-07-15 @ 4:00 am
Onset: 2026-07-14 @ 4:00 pm -> 2026-07-15 @ 4:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Billings MT on 2026-07-14 @ 3:06 pm
Headline: Flood Watch issued July 14 at 2:06PM MDT until July 15 at 3:00AM MDT by NWS Billings MT
Description: * WHAT...Flash flooding caused by excessive rainfall from
thunderstorms is possible.

* WHERE...Portions of central and south central Montana, including
the following areas, in central Montana, Judith Gap and Southern
Wheatland. In south central Montana, Crazy Mountains.

* WHEN...Through late tonight.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas.

* ADDITIONAL DETAILS...
- Slow moving showers and thunderstorms capable of producing very
heavy rainfall rates.
- http://www.weather.gov/safety/flood

Alert: Flood Watch
Area(s): Musselshell; Northern Stillwater; Golden Valley; Northern Sweet Grass; Melville Foothills; Northeastern Yellowstone; Southwestern Yellowstone
Effective: 2026-07-14 @ 3:06 pm -> 2026-07-15 @ 3:15 pm
Onset: 2026-07-14 @ 4:00 pm -> 2026-07-15 @ 4:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Billings MT on 2026-07-14 @ 3:06 pm
Headline: Flood Watch issued July 14 at 2:06PM MDT until July 15 at 3:00AM MDT by NWS Billings MT
Description: * WHAT...Flash flooding caused by excessive rainfall from
thunderstorms is possible.

* WHERE...Portions of central and south central Montana, including
the following areas, in central Montana, Golden Valley and
Musselshell. In south central Montana, Melville Foothills,
Northeastern Yellowstone, Northern Stillwater, Northern Sweet Grass
and Southwestern Yellowstone.

* WHEN...From Wednesday afternoon through late Wednesday night.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas.

* ADDITIONAL DETAILS...
- Slow moving showers and thunderstorms capable of producing very
heavy rainfall rates.
- http://www.weather.gov/safety/flood

Alert: Flood Watch
Area(s): Red Lodge Foothills; Northern Big Horn; Paradise Valley; Livingston Area; Beartooth Foothills; Absaroka/Beartooth Mountains; Southern Big Horn; Southeastern Carbon; Bighorn Canyon; Northern Carbon; Pryor/Northern Bighorn Mountains; Northeast Bighorn Mountains; Sheridan Foothills
Effective: 2026-07-14 @ 3:06 pm -> 2026-07-15 @ 3:15 pm
Onset: 2026-07-15 @ 1:00 pm -> 2026-07-16 @ 4:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Billings MT on 2026-07-14 @ 3:06 pm
Headline: Flood Watch issued July 14 at 2:06PM MDT until July 16 at 3:00AM MDT by NWS Billings MT
Description: * WHAT...Flash flooding caused by excessive rainfall from
thunderstorms is possible. The risk is greatest for recent area
burn scars including the Robertson Draw and East Side Fires in
Montana, and the Elk Fire in Wyoming.

* WHERE...Portions of south central Montana, including the following
areas, Absaroka/Beartooth Mountains, Beartooth Foothills, Bighorn
Canyon, Livingston Area, Northern Big Horn, Northern Carbon,
Paradise Valley, Pryor/Northern Bighorn Mountains, Red Lodge
Foothills, Southeastern Carbon and Southern Big Horn and north
central Wyoming, including the following areas, Northeast Bighorn
Mountains and Sheridan Foothills.

* WHEN...From Wednesday afternoon through late Wednesday night.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas.

* ADDITIONAL DETAILS...
- Slow moving showers and thunderstorms capable of producing very
heavy rainfall rates.
- http://www.weather.gov/safety/flood

Alert: Flood Watch
Area(s): Musselshell; Northern Stillwater; Golden Valley; Northern Sweet Grass; Melville Foothills; Northeastern Yellowstone; Southwestern Yellowstone
Effective: 2026-07-14 @ 3:06 pm -> 2026-07-15 @ 3:15 pm
Onset: 2026-07-15 @ 1:00 pm -> 2026-07-16 @ 4:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Billings MT on 2026-07-14 @ 3:06 pm
Headline: Flood Watch issued July 14 at 2:06PM MDT until July 16 at 3:00AM MDT by NWS Billings MT
Description: * WHAT...Flash flooding caused by excessive rainfall from
thunderstorms is possible.

* WHERE...Portions of central and south central Montana, including
the following areas, in central Montana, Golden Valley and
Musselshell. In south central Montana, Melville Foothills,
Northeastern Yellowstone, Northern Stillwater, Northern Sweet Grass
and Southwestern Yellowstone.

* WHEN...From Wednesday afternoon through late Wednesday night.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas.

* ADDITIONAL DETAILS...
- Slow moving showers and thunderstorms capable of producing very
heavy rainfall rates.
- http://www.weather.gov/safety/flood

Alert: Flood Watch
Area(s): Central and Southeast Phillips; Petroleum; Southwest Phillips
Effective: 2026-07-14 @ 2:41 pm -> 2026-07-15 @ 7:00 am
Onset: 2026-07-14 @ 10:00 pm -> 2026-07-15 @ 7:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Glasgow MT on 2026-07-14 @ 2:41 pm
Headline: Flood Watch issued July 14 at 1:41PM MDT until July 15 at 6:00AM MDT by NWS Glasgow MT
Description: * WHAT...Flash flooding caused by excessive rainfall continues to be
possible.

* WHERE...A portion of northeast Montana, including the following
areas, Central and Southeast Phillips, Petroleum and Southwest
Phillips.

* WHEN...From 9 PM MDT this evening through late tonight.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.

* ADDITIONAL DETAILS...
- - Thunderstorms will be moving east into the Watch area, with
the potential of heavy downpours that would bring flooding.
- http://www.weather.gov/safety/flood

Alert: Heat Advisory
Area(s): Western Roosevelt; Northern Phillips; Southwest Phillips; Northern Valley; Eastern Roosevelt
Effective: 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 3:00 am
Onset: 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 3:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-14 @ 2:38 pm
Headline: Heat Advisory issued July 14 at 1:38PM MDT until July 15 at 2:00AM MDT by NWS Glasgow MT
Description: * WHAT...Heat index values up to 94.

* WHERE...Eastern Roosevelt, Northern Phillips, Northern Valley,
Southwest Phillips, and Western Roosevelt Counties.

* WHEN...Until 2 AM MDT Wednesday.

* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.

Alert: Heat Advisory
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
Effective: 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 8:00 am
Onset: 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 3:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-14 @ 2:38 pm
Headline: Heat Advisory issued July 14 at 1:38PM MDT until July 15 at 2:00AM MDT by NWS Glasgow MT
Description: * WHAT...For the Heat Advisory, heat index values up to 100. For the
Lake Wind Advisory, northeast winds 15 to 25 mph with gusts up to
35 mph.

* WHERE...Central and Southeast Phillips, Central and Southern
Valley, Garfield, McCone, and Petroleum Counties.

* WHEN...For the Heat Advisory, until 2 AM MDT Wednesday. For the
Lake Wind Advisory, until noon MDT Wednesday.

* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft. Hot temperatures and high
humidity may cause heat illnesses.

Alert: Lake Wind Advisory
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
Effective: 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 8:00 am
Onset: 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 1:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-14 @ 2:38 pm
Headline: Lake Wind Advisory issued July 14 at 1:38PM MDT until July 15 at 12:00PM MDT by NWS Glasgow MT
Description: * WHAT...For the Heat Advisory, heat index values up to 100. For the
Lake Wind Advisory, northeast winds 15 to 25 mph with gusts up to
35 mph.

* WHERE...Central and Southeast Phillips, Central and Southern
Valley, Garfield, McCone, and Petroleum Counties.

* WHEN...For the Heat Advisory, until 2 AM MDT Wednesday. For the
Lake Wind Advisory, until noon MDT Wednesday.

* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft. Hot temperatures and high
humidity may cause heat illnesses.

Alert: Extreme Heat Warning
Area(s): Richland; Dawson; Prairie; Wibaux
Effective: 2026-07-14 @ 2:38 pm -> 2026-07-15 @ 8:00 am
Onset: 2026-07-14 @ 2:38 pm -> 2026-07-16 @ 3:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-14 @ 2:38 pm
Headline: Extreme Heat Warning issued July 14 at 1:38PM MDT until July 16 at 2:00AM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with heat index values up to 104.

* WHERE...Dawson, Prairie, Richland, and Wibaux Counties.

* WHEN...Until 2 AM MDT Thursday.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events.