Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Extreme Heat Warning
Area(s): Hill County; Northern Blaine County; 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
Effective: 2026-07-24 @ 2:31 pm -> 2026-07-25 @ 5:45 am
Onset: 2026-07-24 @ 2:31 pm -> 2026-07-26 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-24 @ 2:31 pm
Headline: Extreme Heat Warning issued July 24 at 1:31PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT
Description: * WHAT...Dangerously hot conditions. High temperatures between 100
and 107 degrees expected, with overnight temperatures only dropping
to the mid to upper 60s.

* WHERE...Bears Paw Mountains and Southern Blaine, Cascade County
below 5000ft, Fergus County below 4500ft, Hill County, Judith Basin
County and Judith Gap, Northern Blaine County, and Western and
Central Chouteau County.

* WHEN...Until 9 PM MDT Sunday.

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

* ADDITIONAL DETAILS...Heat will peak during the day on Saturday,
with afternoon and evening high temperatures peaking between 100
and 107 degrees.

Alert: Heat Advisory
Area(s): Eastern Glacier, Western Toole, and Central Pondera; Eastern Toole and Liberty; Eastern Pondera and Eastern Teton; Gates of the Mountains; Helena Valley; Meagher County Valleys; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley; Beaverhead and Western Madison below 6000ft
Effective: 2026-07-24 @ 2:31 pm -> 2026-07-25 @ 5:45 am
Onset: 2026-07-24 @ 2:31 pm -> 2026-07-26 @ 10:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-24 @ 2:31 pm
Headline: Heat Advisory issued July 24 at 1:31PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT
Description: * WHAT...High temperatures up to 100 degrees expected.

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

* WHEN...Until 9 PM MDT Sunday.

* IMPACTS...Hot temperatures may cause heat illnesses.

* ADDITIONAL DETAILS...The heat will peak on Saturday, with lower
elevation temperatures reaching the upper 90s to near 100 degrees.

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; Crow Indian Reservation/Big Horn Canyon Rec Area; Northern Rosebud/Northern Treasure Counties; Northern Cheyenne Indian Reservation/Ashland Ranger District Custer Natl Forest; Custer County; Sioux Ranger District Custer National Forest; Sheridan County/Casper BLM; Bighorn National Forest
Effective: 2026-07-24 @ 2:09 pm -> 2026-07-25 @ 2:15 pm
Onset: 2026-07-25 @ 1:00 pm -> 2026-07-26 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-24 @ 2:09 pm
Headline: Red Flag Warning issued July 24 at 1:09PM MDT until July 26 at 12:00AM MDT by NWS Billings MT
Description: The National Weather Service in Billings has issued a Red Flag
Warning...which is in effect from noon Saturday to midnight MDT
Saturday night. The Fire Weather Watch is no longer in effect.

* IMPACTS: Low humidities, hot temperatures, and increasing
thunderstorm activity will create erratic fire behavior and new
fire starts.

* AFFECTED AREA:
In North Central WY Fire Zones...274...284.
In South Central MT Fire Zones...123...124...125...126...127
128...129.
In Southeast MT Fire Zones...130...131...132.
In Southeast MT and Northwest SD Fire Zone...133.

* COUNTIES AFFECTED:
In Central MT...Golden Valley...Musselshell...Wheatland.
In North Central WY...Big Horn...Johnson...Sheridan...Washakie.
In Northwest SD...Harding.
In South Central MT...Big Horn...Carbon...Park...Stillwater
Sweet Grass...Yellowstone.
In Southeast MT...Carter...Custer...Fallon...Powder River
Rosebud...Treasure.
In Southwest MT...Gallatin.

* WIND: Southwest 10 to 15 mph with gusts up to 25 mph.

* THUNDERSTORMS: Widely scattered afternoon and evening
thunderstorms will produce gusty and erratic winds, and spotty
rainfall.

* HUMIDITY: As low as 11 percent.

* TEMPERATURES: Up to 108.

Alert: Extreme Heat Warning
Area(s): Musselshell; Treasure; Northern Rosebud; Custer; Fallon; Northern Stillwater; Powder River; Carter; Golden Valley; Northern Big Horn; Southern Rosebud; Southern Big Horn; Southeastern Carbon; Bighorn Canyon; Northern Carbon; Northeastern Yellowstone; Southwestern Yellowstone; Sheridan Foothills
Effective: 2026-07-24 @ 1:35 pm -> 2026-07-25 @ 1:45 pm
Onset: 2026-07-24 @ 1:35 pm -> 2026-07-26 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-24 @ 1:35 pm
Headline: Extreme Heat Warning issued July 24 at 12:35PM MDT until July 26 at 9:00PM MDT by NWS Billings MT
Description: * WHAT...Dangerously hot conditions with high temperatures of 98 to
108, hottest over eastern Montana. Saturday is expected to be the
hottest day.

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

* WHEN...Until 9 PM MDT Sunday.

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

* ADDITIONAL DETAILS...Dangerously hot daytime temperatures combined
with warm overnight low temperatures will produce cumulative heat
stress. This heat stress will quickly become dangerous to anyone
without adequate cooling and hydration.

Alert: Heat Advisory
Area(s): Northern Park; Red Lodge Foothills; Judith Gap; Paradise Valley; Livingston Area; Beartooth Foothills; Northern Sweet Grass; Melville Foothills; Southern Wheatland
Effective: 2026-07-24 @ 1:35 pm -> 2026-07-25 @ 1:45 pm
Onset: 2026-07-24 @ 1:35 pm -> 2026-07-26 @ 10:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-24 @ 1:35 pm
Headline: Heat Advisory issued July 24 at 12:35PM MDT until July 26 at 9:00PM MDT by NWS Billings MT
Description: * WHAT...Hot conditions with high temperatures of 90 to 100. Saturday
is expected to be the hottest day.

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

* WHEN...Until 9 PM MDT Sunday.

* IMPACTS...Hot temperatures may cause heat illnesses.

* ADDITIONAL DETAILS...Hot daytime temperatures combined with warm
overnight low temperatures will produce cumulative heat stress.
This heat stress will become dangerous to anyone without adequate
cooling and hydration.

Alert: Red Flag Warning
Area(s): Eastern Beaverhead National Forest
Effective: 2026-07-24 @ 1:15 pm -> 2026-07-25 @ 10:00 pm
Onset: 2026-07-25 @ 2:00 pm -> 2026-07-25 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-07-24 @ 1:15 pm
Headline: Red Flag Warning issued July 24 at 12:15PM MDT until July 25 at 9:00PM MDT by NWS Missoula MT
Description: ...RED FLAG WARNING IN EFFECT FROM 1 PM TO 9 PM MDT SATURDAY DUE TO
LIGHTNING AND WIND, LOW RELATIVE HUMIDITY FOR EAST BEAVERHEAD...

The National Weather Service in Missoula MT has issued a Red Flag
Warning.

* AFFECTED AREA...Fire Weather Zone 111.

* TIMING...From 1 PM to 9 PM MDT Saturday.

* WINDS...Southwest winds 15 to 25 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...Relative Humidity between 15 to 25 percent.

* THUNDERSTORMS...Isolated to scattered thunderstorms producing
minimal precipitation. Erratic outflow winds of 55 to 65 mph
possible.

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

Alert: Red Flag Warning
Area(s): Dawson/McCone/Prairie/Richland/Wibaux Counties
Effective: 2026-07-24 @ 1:11 pm -> 2026-07-24 @ 10:00 pm
Onset: 2026-07-24 @ 1:11 pm -> 2026-07-24 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-24 @ 1:11 pm
Headline: Red Flag Warning issued July 24 at 12:11PM MDT until July 24 at 9:00PM MDT by NWS Glasgow MT
Description: * WIND...West at 15 to 25 mph with gusts to 35 mph.

* HUMIDITY...As low as 15 percent.

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

Alert: Red Flag Warning
Area(s): Northern Valley and Northern Phillips Counties; The Little Rockies; The Lower Missouri River Breaks including the Charles M Russell National Wildlife Refuge; Southern Petroleum and Southern Garfield Counties
Effective: 2026-07-24 @ 1:11 pm -> 2026-07-25 @ 5:00 am
Onset: 2026-07-24 @ 1:11 pm -> 2026-07-24 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-24 @ 1:11 pm
Headline: Red Flag Warning issued July 24 at 12:11PM MDT until July 24 at 9:00PM MDT by NWS Glasgow MT
Description: ...RED FLAG WARNING IN EFFECT FROM 4 PM TO 10 PM MDT SATURDAY FOR
LIGHTNING FROM THUNDERSTORMS FOR FIRE WEATHER ZONES 134, 135,
136, AND 137...

The National Weather Service in Glasgow has issued a Red Flag
Warning, which is in effect from 4 PM to 10 PM MDT Saturday.

* WIND...Today: West at 15 to 25 mph with gusts to 35 mph.
Saturday: South southwest at 10 to 15 mph with gusts to 25 mph.

* HUMIDITY...Today: As low as 15 percent. Saturday: As low as 13
percent.

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

* ADDITIONAL DETAILS...Isolated thunderstorms are expected on
Saturday, so lightning is the main concern for fire starts.

Alert: Red Flag Warning
Area(s): Northern Valley and Northern Phillips Counties; The Little Rockies; The Lower Missouri River Breaks including the Charles M Russell National Wildlife Refuge; Southern Petroleum and Southern Garfield Counties
Effective: 2026-07-24 @ 1:11 pm -> 2026-07-25 @ 5:00 am
Onset: 2026-07-25 @ 5:00 pm -> 2026-07-25 @ 11:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-24 @ 1:11 pm
Headline: Red Flag Warning issued July 24 at 12:11PM MDT until July 25 at 10:00PM MDT by NWS Glasgow MT
Description: ...RED FLAG WARNING IN EFFECT FROM 4 PM TO 10 PM MDT SATURDAY FOR
LIGHTNING FROM THUNDERSTORMS FOR FIRE WEATHER ZONES 134, 135,
136, AND 137...

The National Weather Service in Glasgow has issued a Red Flag
Warning, which is in effect from 4 PM to 10 PM MDT Saturday.

* WIND...Today: West at 15 to 25 mph with gusts to 35 mph.
Saturday: South southwest at 10 to 15 mph with gusts to 25 mph.

* HUMIDITY...Today: As low as 15 percent. Saturday: As low as 13
percent.

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

* ADDITIONAL DETAILS...Isolated thunderstorms are expected on
Saturday, so lightning is the main concern for fire starts.

Alert: Extreme Heat Warning
Area(s): Daniels; Sheridan
Effective: 2026-07-24 @ 12:04 pm -> 2026-07-25 @ 5:00 am
Onset: 2026-07-24 @ 12:04 pm -> 2026-07-26 @ 11:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-24 @ 12:04 pm
Headline: Extreme Heat Warning issued July 24 at 11:04AM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with highs up to 102 expected.

* WHERE...Daniels and Sheridan Counties.

* WHEN...Until 10 PM MDT Sunday.

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

Alert: Extreme Heat Warning
Area(s): Western Roosevelt; Richland; Dawson; Prairie; Wibaux; Southwest Phillips; Eastern Roosevelt
Effective: 2026-07-24 @ 12:04 pm -> 2026-07-25 @ 5:00 am
Onset: 2026-07-24 @ 12:04 pm -> 2026-07-26 @ 11:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-24 @ 12:04 pm
Headline: Extreme Heat Warning issued July 24 at 11:04AM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with highs up to 106 expected.

* WHERE...Dawson, Eastern Roosevelt, Prairie, Richland, Southwest
Phillips, Western Roosevelt, and Wibaux Counties.

* WHEN...Until 10 PM MDT Sunday.

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

Alert: Lake Wind Advisory
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
Effective: 2026-07-24 @ 12:04 pm -> 2026-07-25 @ 5:00 am
Onset: 2026-07-24 @ 1:00 pm -> 2026-07-24 @ 7:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-24 @ 12:04 pm
Headline: Lake Wind Advisory issued July 24 at 11:04AM MDT until July 24 at 6:00PM MDT by NWS Glasgow MT
Description: * WHAT...For the Extreme Heat Warning, dangerously hot conditions
with highs up to 105 expected. For the Lake Wind Advisory, west
winds 15 to 25 mph with gusts up to 35 mph expected.

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

* WHEN...For the Extreme Heat Warning, until 10 PM MDT Sunday. For
the Lake Wind Advisory, until 6 PM MDT this evening.

* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft. Heat related illnesses
increase significantly during extreme heat and high humidity
events.

* ADDITIONAL DETAILS...Waves up to 4 feet are expected over Fort Peck
Lake today.

Alert: Extreme Heat Warning
Area(s): Northern Phillips; Northern Valley
Effective: 2026-07-24 @ 12:04 pm -> 2026-07-25 @ 5:00 am
Onset: 2026-07-24 @ 12:04 pm -> 2026-07-26 @ 11:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-24 @ 12:04 pm
Headline: Extreme Heat Warning issued July 24 at 11:04AM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with highs up to 105 expected.

* WHERE...Northern Phillips and Northern Valley Counties.

* WHEN...Until 10 PM MDT Sunday.

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

Alert: Extreme Heat Warning
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
Effective: 2026-07-24 @ 12:04 pm -> 2026-07-25 @ 5:00 am
Onset: 2026-07-24 @ 12:04 pm -> 2026-07-26 @ 11:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-24 @ 12:04 pm
Headline: Extreme Heat Warning issued July 24 at 11:04AM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT
Description: * WHAT...For the Extreme Heat Warning, dangerously hot conditions
with highs up to 105 expected. For the Lake Wind Advisory, west
winds 15 to 25 mph with gusts up to 35 mph expected.

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

* WHEN...For the Extreme Heat Warning, until 10 PM MDT Sunday. For
the Lake Wind Advisory, until 6 PM MDT this evening.

* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft. Heat related illnesses
increase significantly during extreme heat and high humidity
events.

* ADDITIONAL DETAILS...Waves up to 4 feet are expected over Fort Peck
Lake today.

Alert: Red Flag Warning
Area(s): Eastern Glacier/Toole/Central/Eastern Pondera/Liberty; Hill and Blaine Counties; Lewis and Clark National Forest Rocky Mountain District-Rocky Mountain Front; Chouteau and Fergus Counties; Central and Eastern Lewis and Clark National Forest Areas
Effective: 2026-07-24 @ 12:28 am -> 2026-07-24 @ 7:15 pm
Onset: 2026-07-24 @ 11:00 am -> 2026-07-25 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-24 @ 12:28 am
Headline: Red Flag Warning issued July 23 at 11:28PM MDT until July 25 at 9:00PM MDT by NWS Great Falls MT
Description: * AFFECTED AREA...Eastern Glacier/Toole/Central/Eastern
Pondera/Liberty, Hill and Blaine Counties, Lewis and Clark
National Forest Rocky Mountain District-Rocky Mountain Front,
Chouteau and Fergus Counties and Central and Eastern Lewis and
Clark National Forest Areas.

* WINDS...Southwest 15 to 25 mph with gusts up to 40 mph.

* RELATIVE HUMIDITY...As low as 10 percent.

* TEMPERATURES...Up to 100 on Friday and up to 106 on Saturday.

* THUNDERSTORMS...Isolated to widely scattered showers and
thunderstorms may cause localized strong, and erratic wind
gusts and lightning, mostly over zones 115 and 117 Saturday
afternoon.

* IMPACTS...Containment of any ongoing or new fires may be very
difficult.