Yellowstone National Park, Wyoming

Regional Weather Alerts


     

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

Alert: Heat Advisory
Area(s): Eastern Toole and Liberty; Hill County; Northern Blaine County; Southern High Plains; Eastern Pondera and Eastern Teton; 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; Gates of the Mountains; Helena Valley; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley
Effective: 2026-07-13 @ 3:20 pm -> 2026-07-13 @ 10:00 pm
Onset: 2026-07-13 @ 3:20 pm -> 2026-07-13 @ 10:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-13 @ 3:20 pm
Headline: Heat Advisory issued July 13 at 2:20PM MDT until July 13 at 9:00PM MDT by NWS Great Falls MT
Description: * WHAT...Hot daytime temperatures of 90 to 98 degrees, with overnight
temperatures of 60 to 70 degrees.

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

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

* IMPACTS...Multiple days of hot temperatures may cause heat
illnesses and cumulative heat stress.

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: 2026-07-13 @ 3:16 pm -> 2026-07-14 @ 4:15 am
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 2026-07-13 @ 3:16 pm
Headline: Flood Watch issued July 13 at 2:16PM MDT until July 15 at 12:00AM MDT by NWS Great Falls MT
Description: * WHAT...Flash flooding caused by excessive rainfall is possible.

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

* WHEN...From Tuesday afternoon through Tuesday evening.

* 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 and along 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...
Great Falls, Bozeman, Helena, Lewistown, Townsend, Fort Benton,
West Yellowstone, 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: Extreme Heat Warning
Area(s): Musselshell; Northern Stillwater; Northern Park; Golden Valley; Red Lodge Foothills; Judith Gap; Paradise Valley; Livingston Area; Beartooth Foothills; Northern Sweet Grass; Northern Carbon; Melville Foothills; Southern Wheatland
Effective: 2026-07-13 @ 2:08 pm -> 2026-07-14 @ 1:00 am
Onset: 2026-07-13 @ 2:08 pm -> 2026-07-14 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-13 @ 2:08 pm
Headline: Extreme Heat Warning issued July 13 at 1:08PM MDT until July 14 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 and south central Montana.

* WHEN...Until midnight MDT tonight.

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

* ADDITIONAL DETAILS...Very hot conditions with high temperatures of
94 to 99 today.

Alert: Extreme Heat Warning
Area(s): Treasure; Northern Rosebud; Northern Big Horn; Southern Big Horn; Southeastern Carbon; Bighorn Canyon; Northeastern Yellowstone; Southwestern Yellowstone
Effective: 2026-07-13 @ 2:08 pm -> 2026-07-14 @ 2:15 pm
Onset: 2026-07-13 @ 2:08 pm -> 2026-07-15 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-13 @ 2:08 pm
Headline: Extreme Heat Warning issued July 13 at 1:08PM 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 south central and southeast Montana.

* WHEN...Until midnight MDT Tuesday Night.

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

* ADDITIONAL DETAILS...Dangerously hot conditions with high
temperatures of 98 to 105 today and Tuesday. Overnight lows will
remain well above normal providing only limited relief.

Alert: Extreme Heat Warning
Area(s): Custer; Fallon; Powder River; Carter; Southern Rosebud; Sheridan Foothills
Effective: 2026-07-13 @ 2:08 pm -> 2026-07-14 @ 2:15 pm
Onset: 2026-07-13 @ 2:08 pm -> 2026-07-16 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-13 @ 2:08 pm
Headline: Extreme Heat Warning issued July 13 at 1:08PM MDT until July 16 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Extremely 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...Dangerously hot conditions with temperatures
of 98 to 106 today through Wednesday. Overnight lows will remain
well above normal providing only limited relief.

Alert: Heat Advisory
Area(s): Daniels; Sheridan
Effective: 2026-07-13 @ 1:11 pm -> 2026-07-14 @ 3:00 am
Onset: 2026-07-13 @ 1:11 pm -> 2026-07-14 @ 3:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-13 @ 1:11 pm
Headline: Heat Advisory issued July 13 at 12:11PM MDT until July 14 at 2:00AM MDT by NWS Glasgow MT
Description: * WHAT...Heat index values up to 95 expected.

* WHERE...Daniels and Sheridan Counties.

* WHEN...Until 2 AM MDT Tuesday.

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

Alert: Extreme Heat Warning
Area(s): Richland; Dawson; Eastern Roosevelt
Effective: 2026-07-13 @ 1:11 pm -> 2026-07-14 @ 7:00 am
Onset: 2026-07-13 @ 1:11 pm -> 2026-07-14 @ 3:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-13 @ 1:11 pm
Headline: Extreme Heat Warning issued July 13 at 12:11PM MDT until July 14 at 2:00AM MDT by NWS Glasgow MT
Description: * WHAT...For the Extreme Heat Warning, dangerously hot conditions
with heat index values up to 95. For the Heat Advisory, heat index
values up to 98 expected.

* WHERE...Dawson, Eastern Roosevelt, and Richland Counties.

* WHEN...For the Extreme Heat Warning, until 2 AM MDT Tuesday. For
the Heat Advisory, from 2 AM Tuesday to 2 AM MDT Wednesday.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events. Hot temperatures and high
humidity may cause heat illnesses.

Alert: Heat Advisory
Area(s): Richland; Dawson; Eastern Roosevelt
Effective: 2026-07-13 @ 1:11 pm -> 2026-07-14 @ 7:00 am
Onset: 2026-07-14 @ 3:00 am -> 2026-07-15 @ 3:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-13 @ 1:11 pm
Headline: Heat Advisory issued July 13 at 12:11PM MDT until July 15 at 2:00AM MDT by NWS Glasgow MT
Description: * WHAT...For the Extreme Heat Warning, dangerously hot conditions
with heat index values up to 95. For the Heat Advisory, heat index
values up to 98 expected.

* WHERE...Dawson, Eastern Roosevelt, and Richland Counties.

* WHEN...For the Extreme Heat Warning, until 2 AM MDT Tuesday. For
the Heat Advisory, from 2 AM Tuesday to 2 AM MDT Wednesday.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat and high humidity events. 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: 2026-07-13 @ 1:11 pm -> 2026-07-14 @ 7:00 am
Onset: 2026-07-13 @ 1:11 pm -> 2026-07-15 @ 3:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-13 @ 1:11 pm
Headline: Heat Advisory issued July 13 at 12:11PM MDT until July 15 at 2:00AM MDT by NWS Glasgow MT
Description: * WHAT...For the Heat Advisory, heat index values up to 93 expected.
For the Lake Wind Advisory, northeast winds 10 to 20 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 first Heat Advisory and second Heat Advisory, until
2 AM MDT Wednesday. For the Lake Wind Advisory, from 10 AM Tuesday
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.

Alert: Heat Advisory
Area(s): Western Roosevelt; Northern Phillips; Southwest Phillips; Northern Valley
Effective: 2026-07-13 @ 1:11 pm -> 2026-07-14 @ 7:00 am
Onset: 2026-07-13 @ 1:11 pm -> 2026-07-15 @ 3:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-13 @ 1:11 pm
Headline: Heat Advisory issued July 13 at 12:11PM MDT until July 15 at 2:00AM MDT by NWS Glasgow MT
Description: * WHAT...Heat index values up to 93 expected.

* WHERE...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: Lake Wind Advisory
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
Effective: 2026-07-13 @ 1:11 pm -> 2026-07-14 @ 7:00 am
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 2026-07-13 @ 1:11 pm
Headline: Lake Wind Advisory issued July 13 at 12:11PM MDT until July 15 at 12:00PM MDT by NWS Glasgow MT
Description: * WHAT...For the Heat Advisory, heat index values up to 93 expected.
For the Lake Wind Advisory, northeast winds 10 to 20 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 first Heat Advisory and second Heat Advisory, until
2 AM MDT Wednesday. For the Lake Wind Advisory, from 10 AM Tuesday
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.

Alert: Extreme Heat Warning
Area(s): Prairie; Wibaux
Effective: 2026-07-13 @ 1:11 pm -> 2026-07-14 @ 7:00 am
Onset: 2026-07-13 @ 1:11 pm -> 2026-07-16 @ 3:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-13 @ 1:11 pm
Headline: Extreme Heat Warning issued July 13 at 12:11PM MDT until July 16 at 2:00AM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with heat index values up to 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.