Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Red Flag Warning |
| Area(s): | Northern Rosebud/Northern Treasure Counties |
| Effective: | 2026-09-03 @ 3:53 am -> 2026-09-03 @ 10:00 pm |
| Onset: | 2026-09-03 @ 1:00 pm -> 2026-09-03 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-09-03 @ 3:53 am |
| Headline: | Red Flag Warning issued September 3 at 2:53AM MDT until September 3 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 noon today to 9 PM MDT this evening. * IMPACTS: Low humidities and strong gusty winds will create erratic fire behavior. * AFFECTED AREA: In Southeast MT Fire Zone...130. * COUNTIES AFFECTED: In Southeast MT...Rosebud...Treasure. * WIND: Southwest 10 to 20 mph with gusts up to 30 mph. * HUMIDITY: As low as 14 percent. * ADDITIONAL DETAILS: For MTZ123 and MTZ126, the worst conditions are expected across the lower elevations. |
| 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; Bighorn National Forest |
| Effective: | 2026-09-03 @ 3:53 am -> 2026-09-03 @ 10:00 pm |
| Onset: | 2026-09-03 @ 1:00 pm -> 2026-09-03 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-09-03 @ 3:53 am |
| Headline: | Red Flag Warning issued September 3 at 2:53AM MDT until September 3 at 9:00PM MDT by NWS Billings MT |
| Description: |
* IMPACTS: Low humidities and strong gusty winds will create erratic fire behavior. * AFFECTED AREA: In North Central WY Fire Zone...284. In South Central MT Fire Zones...123...124...125...126...127 128...129. * COUNTIES AFFECTED: In Central MT...Golden Valley...Musselshell...Wheatland. In North Central WY...Big Horn...Johnson...Sheridan...Washakie. In South Central MT...Big Horn...Carbon...Park...Stillwater Sweet Grass...Yellowstone. In Southwest MT...Gallatin. * WIND: Southwest 10 to 20 mph with gusts up to 40 mph. The strongest winds are forecast in the mountains and foothills. * HUMIDITY: As low as 15 percent. * ADDITIONAL DETAILS: For MTZ123 and MTZ126, the worst conditions are expected across the lower elevations. |
| Alert: | Fire Weather Watch |
| Area(s): | Northern Cheyenne Indian Reservation/Ashland Ranger District Custer Natl Forest; Custer County; Sioux Ranger District Custer National Forest; Sheridan County/Casper BLM |
| Effective: | 2026-09-03 @ 3:53 am -> 2026-09-04 @ 4:00 am |
| Onset: | 2026-09-04 @ 1:00 pm -> 2026-09-04 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-09-03 @ 3:53 am |
| Headline: | Fire Weather Watch issued September 3 at 2:53AM MDT until September 4 at 9:00PM MDT by NWS Billings MT |
| Description: |
The National Weather Service in Billings has issued a Fire Weather Watch...which is in effect from Friday afternoon through Friday evening. * IMPACTS: Low humidities, hot temperatures, and strong gusty winds will create erratic fire behavior. * AFFECTED AREA: In North Central WY Fire Zone...274. In Southeast MT Fire Zones...131...132. In Southeast MT and Northwest SD Fire Zone...133. * COUNTIES AFFECTED: In North Central WY...Sheridan. In Northwest SD...Harding. In South Central MT...Big Horn. In Southeast MT...Carter...Custer...Fallon...Powder River Rosebud...Treasure. * WIND: Southwest 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 10 percent. * TEMPERATURES: Up to 98. |
| Alert: | Red Flag Warning |
| Area(s): | Eastern Beaverhead National Forest |
| Effective: | 2026-09-01 @ 11:22 am -> 2026-09-03 @ 9:00 pm |
| Onset: | 2026-09-02 @ 1:00 pm -> 2026-09-03 @ 9:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-09-01 @ 11:22 am |
| Headline: | Red Flag Warning issued September 1 at 10:22AM MDT until September 3 at 8:00PM MDT by NWS Missoula MT |
| Description: |
...RED FLAG WARNING IN EFFECT FROM NOON WEDNESDAY TO 8 PM MDT THURSDAY DUE TO WIND AND LOW RELATIVE HUMIDITY FOR EAST BEAVERHEAD... .Strong southwest winds will develop Wednesday as a cold front tracks eastward and stalls along the Continental Divide. Winds will peak each afternoon and early evening. Winds will remain elevated Wednesday night, especially across midslopes and ridgetops, with poor humidity recoveries. The National Weather Service in Missoula MT has issued a Red Flag Warning in effect from noon Wednesday to 8 PM MDT Thursday. * AFFECTED AREA...Fire Weather Zone 111. * TIMING...From noon Wednesday to 8 PM MDT Thursday. * WINDS...Southwest winds 30 to 40 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...Relative Humidity between 20 to 30 percent. * IMPACTS...Any fires that develop will spread rapidly. Outdoor burning is not recommended. |