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. |