Yellowstone National Park, Wyoming

Regional Weather Alerts


     
Alert: Red Flag Warning
Area(s): Crow Indian Reservation/Big Horn Canyon Rec Area; Northern Cheyenne Indian Reservation/Ashland Ranger District Custer Natl Forest; Custer County; Sioux Ranger District Custer National Forest; Sheridan County/Casper BLM; Bighorn National Forest
Effective: 2026-09-04 @ 1:06 pm -> 2026-09-04 @ 10:00 pm
Onset: 2026-09-04 @ 1:06 pm -> 2026-09-04 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-09-04 @ 1:06 pm
Headline: Red Flag Warning issued September 4 at 12:06PM MDT until September 4 at 9:00PM MDT by NWS Billings MT
Description: * IMPACTS: Low humidities, hot temperatures, and gusty winds will
 create erratic fire behavior.
* AFFECTED AREA:
 In North Central WY Fire Zones...274...284.
 In South Central MT Fire Zone...129.
 In Southeast MT Fire Zones...131...132.
 In Southeast MT and Northwest SD Fire Zone...133.
* COUNTIES AFFECTED:
 In North Central WY...Big Horn...Johnson...Sheridan...Washakie.
 In Northwest SD...Harding.
 In South Central MT...Big Horn...Carbon...Yellowstone.
 In Southeast MT...Carter...Custer...Fallon...Powder River
 Rosebud...Treasure.
* WIND: Southwest 10 to 20 mph with gusts up to 40 mph.
* HUMIDITY: As low as 10 percent.
* TEMPERATURES: Up to 100.
Alert: Red Flag Warning
Area(s): Dawson/McCone/Prairie/Richland/Wibaux Counties
Effective: 2026-09-04 @ 1:36 am -> 2026-09-04 @ 10:00 pm
Onset: 2026-09-04 @ 10:00 am -> 2026-09-04 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-09-04 @ 1:36 am
Headline: Red Flag Warning issued September 4 at 12:36AM MDT until September 4 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 9 AM this morning to 9 PM MDT
 this evening.
* AFFECTED AREA...Fire weather zone 122.
* WIND...Southeast 15 to 30 mph becoming south to southwest in the
 afternoon.
* HUMIDITY...as low as 14 percent.
* IMPACTS...any fires that develop will likely spread rapidly.
 Outdoor burning is not recommended.