Yellowstone National Park, Wyoming

Regional Weather Alerts


     

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
Effective: 2026-07-12 @ 2:22 pm -> 2026-07-12 @ 10:00 pm
Onset: 2026-07-12 @ 2:22 pm -> 2026-07-12 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-12 @ 2:22 pm
Headline: Red Flag Warning issued July 12 at 1:22PM MDT until July 12 at 9:00PM MDT by NWS Billings MT
Description: * IMPACTS: Low humidities, hot temperatures, and gusty winds will
create erratic fire behavior and new fire starts.

* AFFECTED AREA:
In North Central WY Fire Zone...274.
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...Sheridan.
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: South 10 to 20 mph with gusts up to 35 mph.

* HUMIDITY: Minimums of 5 to 10 percent.

* TEMPERATURES: 105 to 112.

* COLD FRONT: Arrives over south central Montana this evening,
bringing a shift to breezy northwest winds. The front will reach
far southeast Montana early Monday morning. Before the frontal
passage, a southeasterly low level jet will produce gusty
ridgetop winds (up to 40 mph) and a slow humidity recovery over
southeast Montana tonight.

Alert: Extreme Heat Warning
Area(s): Custer; Fallon; Powder River; Carter; Southern Rosebud; Sheridan Foothills
Effective: 2026-07-12 @ 1:54 pm -> 2026-07-13 @ 2:00 pm
Onset: 2026-07-12 @ 1:54 pm -> 2026-07-16 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-12 @ 1:54 pm
Headline: Extreme Heat Warning issued July 12 at 12:54PM MDT until July 16 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Extremely hot daytime temperatures combined with warm
overnight low temperatures 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 104 to 112 today. Highs temperatures Monday through Wednesday
will range from 100 to 105. Overnight lows will remain well above
normal.

Alert: Extreme Heat Warning
Area(s): Treasure; Northern Rosebud; Northern Big Horn; Southern Big Horn; Southeastern Carbon; Bighorn Canyon; Northeastern Yellowstone; Southwestern Yellowstone
Effective: 2026-07-12 @ 1:54 pm -> 2026-07-13 @ 2:00 pm
Onset: 2026-07-12 @ 1:54 pm -> 2026-07-15 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-12 @ 1:54 pm
Headline: Extreme Heat Warning issued July 12 at 12:54PM MDT until July 15 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Extremely hot daytime temperatures combined with warm
overnight low temperatures 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 104 to 112 today. Temperatures Monday through
Tuesday will range from near 100 to 105. Overnight lows will remain
well above normal providing only limited relief.

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: 2026-07-12 @ 1:54 pm -> 2026-07-13 @ 2:00 pm
Onset: 2026-07-12 @ 1:54 pm -> 2026-07-14 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-12 @ 1:54 pm
Headline: Extreme Heat Warning issued July 12 at 12:54PM MDT until July 14 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Extremely hot daytime temperatures combined with warm
overnight low temperatures will produce cumulative heat stress.

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

* WHEN...Until midnight MDT Monday Night.

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

* ADDITIONAL DETAILS...Dangerously hot conditions with high
temperatures of 104 to 112 today. Temperatures will cool slightly
to 95 to 101 Monday.

Alert: Extreme Heat Warning
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield
Effective: 2026-07-12 @ 12:13 pm -> 2026-07-12 @ 11:30 pm
Onset: 2026-07-12 @ 12:13 pm -> 2026-07-13 @ 7:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-12 @ 12:13 pm
Headline: Extreme Heat Warning issued July 12 at 11:13AM MDT until July 13 at 6:00AM MDT by NWS Glasgow MT
Description: * WHAT...For the Extreme Heat Warning, dangerously hot conditions
with heat index values up to 105. For the Lake Wind Advisory,
northwest winds 15 to 20 mph with gusts up to 35 mph expected.

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

* WHEN...For the Extreme Heat Warning, until 6 AM MDT Monday. For the
Lake Wind Advisory, from 9 PM this evening to 6 AM MDT Monday.

* 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...Wave heights as high as 4 feet.

Alert: Lake Wind Advisory
Area(s): McCone
Effective: 2026-07-12 @ 12:13 pm -> 2026-07-12 @ 11:30 pm
Onset: 2026-07-12 @ 10:00 pm -> 2026-07-13 @ 7:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-12 @ 12:13 pm
Headline: Lake Wind Advisory issued July 12 at 11:13AM MDT until July 13 at 6:00AM MDT by NWS Glasgow MT
Description: * WHAT...For the Extreme Heat Warning, dangerously hot conditions
with heat index values up to 106. For the High Wind Warning, south
winds 25 to 35 with gusts up to 60 mph. For the Lake Wind Advisory,
north winds 15 to 20 mph with gusts up to 35 mph expected.

* WHERE...McCone County.

* WHEN...For the Extreme Heat Warning, until 6 AM MDT Monday. For the
High Wind Warning, from 9 PM this evening to 4 AM MDT Monday. For
the Lake Wind Advisory, from 9 PM this evening to 6 AM MDT Monday.

* IMPACTS...Damaging winds could blow down trees and power lines.
Travel could be difficult, especially for high profile vehicles.
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...Wave heights as high as 4 feet.

Alert: Extreme Heat Warning
Area(s): Sheridan; Richland; Dawson; Prairie; Wibaux; Eastern Roosevelt
Effective: 2026-07-12 @ 12:13 pm -> 2026-07-12 @ 11:30 pm
Onset: 2026-07-12 @ 12:13 pm -> 2026-07-13 @ 7:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-12 @ 12:13 pm
Headline: Extreme Heat Warning issued July 12 at 11:13AM MDT until July 13 at 6:00AM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with highs between 99 and 111
today.

* WHERE...Dawson, Eastern Roosevelt, Prairie, Richland, Sheridan, and
Wibaux Counties.

* WHEN...For the Extreme Heat Warning, until 6 AM MDT Monday. For the
High Wind Warning, from 9 PM this evening to 4 AM MDT Monday.

* IMPACTS...Heat related illnesses are part of the story during
extreme heat and high humidity events like this. Make sure to limit
time in the sun.

* ADDITIONAL DETAILS...Temperatures will struggle to drop below 65
degrees at night, so make sure to have ways of keeping the air cool
in apartments and homes.

Alert: Extreme Heat Warning
Area(s): Daniels; Western Roosevelt; Northern Phillips; Southwest Phillips; Northern Valley
Effective: 2026-07-12 @ 12:13 pm -> 2026-07-12 @ 11:30 pm
Onset: 2026-07-12 @ 12:13 pm -> 2026-07-13 @ 7:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-12 @ 12:13 pm
Headline: Extreme Heat Warning issued July 12 at 11:13AM MDT until July 13 at 6:00AM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with highs between 99 and 111
today.

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

* WHEN...Until 6 AM MDT Monday.

* IMPACTS...Heat related illnesses are part of the story during
extreme heat and high humidity events like this. Make sure to limit
time in the sun.

* ADDITIONAL DETAILS...Temperatures will struggle to drop below 65
degrees at night, so make sure to have ways of keeping the air cool
in apartments and homes.

Alert: Extreme Heat Warning
Area(s): McCone
Effective: 2026-07-12 @ 12:13 pm -> 2026-07-12 @ 11:30 pm
Onset: 2026-07-12 @ 12:13 pm -> 2026-07-13 @ 7:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-12 @ 12:13 pm
Headline: Extreme Heat Warning issued July 12 at 11:13AM MDT until July 13 at 6:00AM MDT by NWS Glasgow MT
Description: * WHAT...For the Extreme Heat Warning, dangerously hot conditions
with heat index values up to 106. For the High Wind Warning, south
winds 25 to 35 with gusts up to 60 mph. For the Lake Wind Advisory,
north winds 15 to 20 mph with gusts up to 35 mph expected.

* WHERE...McCone County.

* WHEN...For the Extreme Heat Warning, until 6 AM MDT Monday. For the
High Wind Warning, from 9 PM this evening to 4 AM MDT Monday. For
the Lake Wind Advisory, from 9 PM this evening to 6 AM MDT Monday.

* IMPACTS...Damaging winds could blow down trees and power lines.
Travel could be difficult, especially for high profile vehicles.
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...Wave heights as high as 4 feet.

Alert: Lake Wind Advisory
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield
Effective: 2026-07-12 @ 12:13 pm -> 2026-07-12 @ 11:30 pm
Onset: 2026-07-12 @ 10:00 pm -> 2026-07-13 @ 7:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-12 @ 12:13 pm
Headline: Lake Wind Advisory issued July 12 at 11:13AM MDT until July 13 at 6:00AM MDT by NWS Glasgow MT
Description: * WHAT...For the Extreme Heat Warning, dangerously hot conditions
with heat index values up to 105. For the Lake Wind Advisory,
northwest winds 15 to 20 mph with gusts up to 35 mph expected.

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

* WHEN...For the Extreme Heat Warning, until 6 AM MDT Monday. For the
Lake Wind Advisory, from 9 PM this evening to 6 AM MDT Monday.

* 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...Wave heights as high as 4 feet.

Alert: High Wind Warning
Area(s): McCone
Effective: 2026-07-12 @ 12:13 pm -> 2026-07-12 @ 11:30 pm
Onset: 2026-07-12 @ 10:00 pm -> 2026-07-13 @ 5:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-12 @ 12:13 pm
Headline: High Wind Warning issued July 12 at 11:13AM MDT until July 13 at 4:00AM MDT by NWS Glasgow MT
Description: * WHAT...For the Extreme Heat Warning, dangerously hot conditions
with heat index values up to 106. For the High Wind Warning, south
winds 25 to 35 with gusts up to 60 mph. For the Lake Wind Advisory,
north winds 15 to 20 mph with gusts up to 35 mph expected.

* WHERE...McCone County.

* WHEN...For the Extreme Heat Warning, until 6 AM MDT Monday. For the
High Wind Warning, from 9 PM this evening to 4 AM MDT Monday. For
the Lake Wind Advisory, from 9 PM this evening to 6 AM MDT Monday.

* IMPACTS...Damaging winds could blow down trees and power lines.
Travel could be difficult, especially for high profile vehicles.
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...Wave heights as high as 4 feet.

Alert: High Wind Warning
Area(s): Sheridan; Richland; Dawson; Prairie; Wibaux; Eastern Roosevelt
Effective: 2026-07-12 @ 12:13 pm -> 2026-07-12 @ 11:30 pm
Onset: 2026-07-12 @ 10:00 pm -> 2026-07-13 @ 5:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-12 @ 12:13 pm
Headline: High Wind Warning issued July 12 at 11:13AM MDT until July 13 at 4:00AM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with highs between 99 and 111
today.

* WHERE...Dawson, Eastern Roosevelt, Prairie, Richland, Sheridan, and
Wibaux Counties.

* WHEN...For the Extreme Heat Warning, until 6 AM MDT Monday. For the
High Wind Warning, from 9 PM this evening to 4 AM MDT Monday.

* IMPACTS...Heat related illnesses are part of the story during
extreme heat and high humidity events like this. Make sure to limit
time in the sun.

* ADDITIONAL DETAILS...Temperatures will struggle to drop below 65
degrees at night, so make sure to have ways of keeping the air cool
in apartments and homes.

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: 2026-07-12 @ 9:17 am -> 2026-07-13 @ 7:00 am
Onset: 2026-07-12 @ 9:17 am -> 2026-07-13 @ 10:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-12 @ 9:17 am
Headline: Heat Advisory issued July 12 at 8:17AM MDT until July 13 at 9:00PM MDT by NWS Great Falls MT
Description: * WHAT...Hot daytime temperatures of 95 to 105 degrees, with
overnight temperatures of 60 to 70 degrees expected.

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

* WHEN...Until 9 PM MDT Monday.

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

Alert: Red Flag Warning
Area(s): The Lower Missouri River Breaks including the Charles M Russell National Wildlife Refuge; Southern Petroleum and Southern Garfield Counties
Effective: 2026-07-12 @ 12:00 am -> 2026-07-12 @ 10:00 pm
Onset: 2026-07-12 @ 1:00 pm -> 2026-07-12 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-12 @ 12:00 am
Headline: Red Flag Warning issued July 11 at 11:00PM MDT until July 12 at 9:00PM MDT by NWS Glasgow MT
Description: The National Weather Service in Glasgow has issued a Red Flag
Warning, which is in effect from noon to 9 PM MDT Sunday.

* AFFECTED AREA... Fire weather zones 136 and 137.

* WIND... South at 10 to 20 gust up to 30 mph.

* HUMIDITY... As low as 8 percent.

* THUNDERSTORMS... dry lightning and erratic gusty downdraft
winds from any thunderstorm or rain shower.

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

Alert: Red Flag Warning
Area(s): Eastern Beaverhead National Forest
Effective: 2026-07-11 @ 3:38 pm -> 2026-07-12 @ 10:00 pm
Onset: 2026-07-12 @ 1:00 pm -> 2026-07-12 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-07-11 @ 3:38 pm
Headline: Red Flag Warning issued July 11 at 2:38PM MDT until July 12 at 9:00PM MDT by NWS Missoula MT
Description: ...FIRE WEATHER WATCH IS CANCELLED FOR DEERLODGE/WEST BEAVERHEAD...

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT SUNDAY
DUE TO WIND AND LOW RELATIVE HUMIDITY FOR EAST BEAVERHEAD...

...

* AFFECTED AREA...Fire Weather Zone 111.

* TIMING...From noon to 9 PM MDT Sunday.

* WINDS...Southwest winds 20 to 30 mph with gusts up to 45 mph.

* RELATIVE HUMIDITY...Relative Humidity between 8 to 15 percent.

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

Alert: Fire Weather Watch
Area(s): Eastern Beaverhead National Forest
Effective: 2026-07-11 @ 11:43 am -> 2026-07-11 @ 11:58 am
Onset: 2026-07-12 @ 1:00 pm -> 2026-07-12 @ 10:00 pm
Severity: Severe
Certainty: Observed
Urgency: Past
Issued By: NWS Missoula MT on 2026-07-11 @ 11:43 am
Headline: The Fire Weather Watch has been replaced. Please see the latest information from NWS Missoula MT on this developing situation.
Description: The Fire Weather Watch has been replaced. Please see the latest information from NWS Missoula MT on this developing situation.