Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Extreme Heat Warning
Area(s): Musselshell; Treasure; Northern Rosebud; Northern Stillwater; Golden Valley; Red Lodge Foothills; Northern Big Horn; Southern Big Horn; Southeastern Carbon; Bighorn Canyon; Northern Carbon; Northeastern Yellowstone; Southwestern Yellowstone
Effective: 2026-07-14 @ 4:26 am -> 2026-07-15 @ 1:00 am
Onset: 2026-07-14 @ 4:26 am -> 2026-07-15 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-14 @ 4:26 am
Headline: Extreme Heat Warning issued July 14 at 3:26AM MDT until July 15 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Very hot daytime temperatures combined with warm overnight
lows will produce cumulative heat stress.

* WHERE...Portions of central, south central, and southeast Montana.

* WHEN...Until midnight MDT tonight.

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

* ADDITIONAL DETAILS...It will be very hot today with high
temperatures of 96 to 103.

Alert: Extreme Heat Warning
Area(s): Custer; Fallon; Powder River; Carter; Southern Rosebud; Sheridan Foothills
Effective: 2026-07-14 @ 4:26 am -> 2026-07-15 @ 4:30 am
Onset: 2026-07-14 @ 4:26 am -> 2026-07-16 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-14 @ 4:26 am
Headline: Extreme Heat Warning issued July 14 at 3:26AM MDT until July 16 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Very hot daytime temperatures combined with warm overnight
lows will produce cumulative heat stress.

* WHERE...Portions of southeast Montana and north central Wyoming.

* WHEN...Until midnight MDT Wednesday Night.

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

* ADDITIONAL DETAILS...It will be very hot today and Wednesday with
high temperatures of 98 to 105. Very warm nighttime temps will
provide only limited relief.

Alert: Flood Watch
Area(s): Musselshell; Northern Stillwater; Golden Valley; Judith Gap; Crazy Mountains; Northern Sweet Grass; Melville Foothills; Northeastern Yellowstone; Southern Wheatland; Southwestern Yellowstone
Effective: 2026-07-14 @ 4:17 am -> 2026-07-15 @ 1:00 am
Onset: 2026-07-14 @ 4:00 pm -> 2026-07-15 @ 1:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Billings MT on 2026-07-14 @ 4:17 am
Headline: Flood Watch issued July 14 at 3:17AM MDT until July 15 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...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, Judith Gap,
Musselshell and Southern Wheatland. In south central Montana, Crazy
Mountains, Melville Foothills, Northeastern Yellowstone, Northern
Stillwater, Northern Sweet Grass and Southwestern Yellowstone.

* WHEN...From 3 PM MDT this afternoon through this evening.

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

* ADDITIONAL DETAILS...
- Scattered thunderstorms with the potential to produce very heavy
rainfall are expected late this afternoon through the evening.
Heavy rain from thunderstorms is possible again on Wednesday.
- 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 @ 3:17 am -> 2026-07-14 @ 5:00 pm
Onset: 2026-07-14 @ 3:17 am -> 2026-07-15 @ 3:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-14 @ 3:17 am
Headline: Heat Advisory issued July 14 at 2:17AM MDT until July 15 at 2:00AM MDT by NWS Glasgow MT
Description: * WHAT...Highs in the mid 90s expected.

* 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 @ 3:17 am -> 2026-07-14 @ 5:00 pm
Onset: 2026-07-14 @ 3:17 am -> 2026-07-15 @ 3:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-14 @ 3:17 am
Headline: Heat Advisory issued July 14 at 2:17AM MDT until July 15 at 2:00AM MDT by NWS Glasgow MT
Description: * WHAT...For the Heat Advisory, heat index values up to 98. Highs
today will be in the mid 90s. For the Lake Wind Advisory, northeast
winds 15 to 25 mph with gusts up to 35 mph expected.

* 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, from 10 AM this morning to 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.

* ADDITIONAL DETAILS...Waves on Fort Peck Lake will be up to 4 feet.

Alert: Lake Wind Advisory
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
Effective: 2026-07-14 @ 3:17 am -> 2026-07-14 @ 5:00 pm
Onset: 2026-07-14 @ 11:00 am -> 2026-07-15 @ 1:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-14 @ 3:17 am
Headline: Lake Wind Advisory issued July 14 at 2:17AM MDT until July 15 at 12:00PM MDT by NWS Glasgow MT
Description: * WHAT...For the Heat Advisory, heat index values up to 98. Highs
today will be in the mid 90s. For the Lake Wind Advisory, northeast
winds 15 to 25 mph with gusts up to 35 mph expected.

* 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, from 10 AM this morning to 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.

* ADDITIONAL DETAILS...Waves on Fort Peck Lake will be up to 4 feet.

Alert: Extreme Heat Warning
Area(s): Prairie; Wibaux
Effective: 2026-07-14 @ 3:17 am -> 2026-07-14 @ 5:00 pm
Onset: 2026-07-14 @ 3:17 am -> 2026-07-16 @ 3:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-14 @ 3:17 am
Headline: Extreme Heat Warning issued July 14 at 2:17AM MDT until July 16 at 2:00AM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with heat index values up to 110.
Highs today and Wednesday will be near 100.

* WHERE...Prairie and Wibaux Counties.

* WHEN...Until 2 AM MDT Thursday.

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

Alert: Extreme Heat Warning
Area(s): Richland; Dawson
Effective: 2026-07-14 @ 3:17 am -> 2026-07-14 @ 5:00 pm
Onset: 2026-07-14 @ 3:17 am -> 2026-07-16 @ 3:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-14 @ 3:17 am
Headline: Extreme Heat Warning issued July 14 at 2:17AM MDT until July 16 at 2:00AM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with heat index values up to 110.
Highs today and Wednesday will be near 100 degrees.

* WHERE...Dawson and Richland Counties.

* WHEN...Until 2 AM MDT Thursday.

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

Alert: Flood Watch
Area(s): Southern Rocky Mountain Front; 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; Gallatin and Madison County Mountains and Centennial Mountains
Effective: 2026-07-14 @ 2:55 am -> 2026-07-14 @ 4:15 pm
Onset: 2026-07-14 @ 4:00 pm -> 2026-07-15 @ 1:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-07-14 @ 2:55 am
Headline: Flood Watch issued July 14 at 1:55AM MDT until July 15 at 12:00AM MDT by NWS Great Falls MT
Description: * WHAT...Flash flooding caused by excessive rainfall is possible with
thunderstorms this afternoon and evening.

* WHERE...Portions of central, north central, and southwest Montana.

* WHEN...From this afternoon through this evening.

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

* ADDITIONAL DETAILS...
- Heavy rainfall produced by thunderstorms may lead to flash
flooding. Rainfall rates in excessive of 1 inch per hour are
possible under heavier thunderstorms.
- Some locations that may experience flooding include...
The Horse Gulch burn scar, Great Falls, Bozeman, Helena,
Lewistown, Townsend, Fort Benton, White Sulphur Springs,
Cascade, Big Sandy, Stanford, Lincoln, Belgrade, East Helena,
Three Forks, Manhattan, Belt, Geraldine, Denton, Hobson and the
Horse Gulch burn scar.
- http://www.weather.gov/safety/flood

Alert: Flood Watch
Area(s): Central and Southeast Phillips; Petroleum; Southwest Phillips
Effective: 2026-07-13 @ 3:30 pm -> 2026-07-14 @ 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 2026-07-13 @ 3:30 pm
Headline: Flood Watch issued July 13 at 2:30PM MDT until July 15 at 6:00AM MDT by NWS Glasgow MT
Description: * WHAT...Flash flooding caused by excessive rainfall is possible.

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

* WHEN...From Tuesday evening through late Tuesday night.

* 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