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 @ 3:10 am -> 2026-07-12 @ 10:00 pm
Onset: 2026-07-12 @ 10:00 am -> 2026-07-12 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-12 @ 3:10 am
Headline: Red Flag Warning issued July 12 at 2:10AM MDT until July 12 at 9:00PM MDT by NWS Billings MT
Description: * IMPACTS: Low humidities, very hot temperatures, and strong gusty
winds will create erratic fire behavior.

* 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 to 35 mph.

* HUMIDITY: Minimums of 5 to 10 percent.

* TEMPERATURES: Highs of 105 to 112.

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

Alert: Extreme Heat Warning
Area(s): Musselshell; Treasure; Northern Rosebud; Custer; Fallon; Northern Stillwater; Powder River; Carter; Northern Park; Golden Valley; Red Lodge Foothills; Northern Big Horn; Southern Rosebud; Judith Gap; Paradise Valley; Livingston Area; Beartooth Foothills; Southern Big Horn; Southeastern Carbon; Northern Sweet Grass; Bighorn Canyon; Northern Carbon; Melville Foothills; Northeastern Yellowstone; Southern Wheatland; Southwestern Yellowstone; Sheridan Foothills
Effective: 2026-07-12 @ 2:47 am -> 2026-07-13 @ 3:00 am
Onset: 2026-07-12 @ 2:47 am -> 2026-07-14 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-12 @ 2:47 am
Headline: Extreme Heat Warning issued July 12 at 1:47AM MDT until July 14 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Dangerously hot conditions with high temperatures of 104 to
112 today. Some all time record highs could be broken. Temperatures
will cool slightly to 95 to 104 Monday.

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

* WHEN...Until midnight MDT Monday Night.

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

* ADDITIONAL DETAILS...Extremely 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: Extreme Heat Warning
Area(s): Central and Southeast Phillips; Central and Southern Valley; Daniels; Sheridan; Western Roosevelt; Petroleum; Garfield; McCone; Richland; Dawson; Prairie; Wibaux; Northern Phillips; Southwest Phillips; Northern Valley; Eastern Roosevelt
Effective: 2026-07-12 @ 12:15 am -> 2026-07-12 @ 3:00 pm
Onset: 2026-07-12 @ 12:15 am -> 2026-07-13 @ 7:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-12 @ 12:15 am
Headline: Extreme Heat Warning issued July 11 at 11:15PM MDT until July 13 at 6:00AM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with heat index values up to 105.

* WHERE...A portion of northeast Montana.

* WHEN...Until 6 AM MDT Monday.

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

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: 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: 2026-07-11 @ 11:30 pm -> 2026-07-12 @ 6:00 pm
Onset: 2026-07-11 @ 11:30 pm -> 2026-07-13 @ 10:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-07-11 @ 11:30 pm
Headline: Heat Advisory issued July 11 at 10:30PM 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): 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.