Yellowstone National Park, Wyoming
Regional Weather Alerts
| 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: | 2026-07-11 @ 1:05 pm -> 2026-07-12 @ 5:15 am |
| Onset: | 2026-07-11 @ 1:05 pm -> 2026-07-13 @ 7:00 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-11 @ 1:05 pm |
| Headline: | Extreme Heat Warning issued July 11 at 12:05PM MDT until July 13 at 6:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Dangerously hot conditions with highs between 93 and 106 this afternoon and highs between 99 and 111 on Sunday expected. * WHERE...All of northeast Montana. * 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: | 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 @ 12:49 pm -> 2026-07-12 @ 7:00 am |
| Onset: | 2026-07-11 @ 1:00 pm -> 2026-07-13 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-11 @ 12:49 pm |
| Headline: | Heat Advisory issued July 11 at 11:49AM 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: | 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: | 2026-07-11 @ 12:09 pm -> 2026-07-12 @ 12:15 pm |
| Onset: | 2026-07-11 @ 12:09 pm -> 2026-07-14 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-11 @ 12:09 pm |
| Headline: | Extreme Heat Warning issued July 11 at 11:09AM MDT until July 14 at 12:00AM MDT by NWS Billings MT |
| Description: |
* WHAT...Dangerously hot conditions with high temperatures of 100 to 113 expected, hottest Sunday. Some all time record highs are possible on Sunday. * 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: | 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: | 2026-07-11 @ 12:03 pm -> 2026-07-12 @ 12:15 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 2026-07-11 @ 12:03 pm |
| Headline: | Red Flag Warning issued July 11 at 11:03AM MDT until July 12 at 9:00PM MDT by NWS Billings MT |
| Description: |
The National Weather Service in Billings has issued a Red Flag Warning...which is in effect from 9 AM to 9 PM MDT Sunday. The Fire Weather Watch is no longer in effect. * 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 up to 30 mph. * HUMIDITY: 5 to 10 percent. * TEMPERATURES: from 105 to 112. |
| 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. |
| Alert: | Red Flag Warning |
| Area(s): | Eastern Beaverhead National Forest |
| Effective: | 2026-07-11 @ 11:43 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 Missoula MT on 2026-07-11 @ 11:43 am |
| Headline: | Red Flag Warning issued July 11 at 10:43AM MDT until July 12 at 9:00PM MDT by NWS Missoula MT |
| Description: |
...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT SUNDAY DUE TO WIND AND LOW RELATIVE HUMIDITY FOR EAST BEAVERHEAD... ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY EVENING DUE TO WIND AND LOW RELATIVE HUMIDITY FOR DEERLODGE/WEST BEAVERHEAD... ... The National Weather Service in Missoula MT has issued a Red Flag Warning in effect from noon to 9 PM MDT Sunday. * 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): | Deerlodge/Western Beaverhead National Forest |
| Effective: | 2026-07-11 @ 11:43 am -> 2026-07-12 @ 10:00 pm |
| Onset: | 2026-07-12 @ 1:00 pm -> 2026-07-12 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Missoula MT on 2026-07-11 @ 11:43 am |
| Headline: | Fire Weather Watch issued July 11 at 10:43AM MDT until July 12 at 9:00PM MDT by NWS Missoula MT |
| Description: |
...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT SUNDAY DUE TO WIND AND LOW RELATIVE HUMIDITY FOR EAST BEAVERHEAD... ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY EVENING DUE TO WIND AND LOW RELATIVE HUMIDITY FOR DEERLODGE/WEST BEAVERHEAD... ... * AFFECTED AREA...Fire Weather Zone 110. * TIMING...From Sunday afternoon through Sunday evening. * WINDS...West winds 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...Relative Humidity between 15 to 34 percent. * IMPACTS...Any fires that develop will spread rapidly. Outdoor burning is not recommended. |