Cheyenne, 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; 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): Northern Campbell; Southern Campbell; Weston County Plains
Effective: 2026-09-03 @ 2:45 am -> 2026-09-03 @ 2:45 pm
Onset: 2026-09-03 @ 1:00 pm -> 2026-09-03 @ 9:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Rapid City SD on 2026-09-03 @ 2:45 am
Headline: Red Flag Warning issued September 3 at 1:45AM MDT until September 3 at 8:00PM MDT by NWS Rapid City SD
Description: ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS
EVENING DUE TO GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FALL RIVER
COUNTY AREA...

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 8 PM MDT
THIS EVENING DUE TO GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR
NORTHERN CAMPBELL, SOUTHERN CAMPBELL, AND WESTON COUNTY PLAINS...

* AFFECTED AREA...Fire Weather Zones 314, 315, and 317.

* TIMING...From noon today to 8 PM MDT this evening.

* WINDS...Southwest winds 10 to 20 mph with gusts up to 30 mph.

* RELATIVE HUMIDITY...Relative Humidity as low as 8 percent.

* IMPACTS...Any fires that develop will spread rapidly. Outdoor
burning is not recommended.

Alert: Red Flag Warning
Area(s): Niobrara/Lower Elevations of Converse/Thunder Basin National Grassland; Middle North Platte River Basin/Niobrara and Converse High Plains
Effective: 2026-09-03 @ 2:33 am -> 2026-09-03 @ 8:00 pm
Onset: 2026-09-03 @ 1:00 pm -> 2026-09-03 @ 8:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Cheyenne WY on 2026-09-03 @ 2:33 am
Headline: Red Flag Warning issued September 3 at 1:33AM MDT until September 3 at 7:00PM MDT by NWS Cheyenne WY
Description: * AFFECTED AREA...Fire weather zone 417.Fire weather zone 418.

* WIND...Southwest at 15 to 25 mph with gusts up to 35 mph.

* HUMIDITY...Between 10 and 15 percent.

* IMPACTS..Any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.

Alert: Red Flag Warning
Area(s): North Bighorn Basin/Worland BLM; Cody Foothills; Lincoln and Uinta Counties/Lower Elevations; Upper Green River Basin/Rock Springs BLM; Sweetwater County/Rock Springs BLM/Flaming Gorge NRA; Natrona County/Casper BLM; Johnson County/Casper BLM; South Bighorn Basin/Worland BLM; Upper Wind River Basin/Wind River Basin; South Bighorn Mountains; Absaroka Mountains/North Shoshone NF; Owl Creek Mountains; East Wind River Mountains/South Shoshone NF; Granite/Green/Ferris/Rattlesnake Mountains; Casper Mountain
Effective: 2026-09-03 @ 2:30 am -> 2026-09-03 @ 7:00 pm
Onset: 2026-09-03 @ 1:00 pm -> 2026-09-03 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Riverton WY on 2026-09-03 @ 2:30 am
Headline: Red Flag Warning issued September 3 at 1:30AM MDT until September 3 at 9:00PM MDT by NWS Riverton WY
Description: * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and
Strong Gusty Winds could cause erratic fire behavior.

* AFFECTED AREA:
In Central WY Fire Zones...280...283...285...288...289...300.
In North Central WY Fire Zones...275...276...281...282...287.
In Northwest WY Fire Zone....286.
In Southwest WY Fire Zones...277...279.
In West Central WY Fire Zone....278.

* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In North Central WY...Big Horn...Hot Springs...Johnson...Park
Washakie.
In Southwest WY...Sweetwater...Uinta.
In West Central WY...Lincoln...Sublette.

* WIND: Southwest 15 to 25 mph with gusts up to 35 mph.

* HUMIDITY: As low as 10 to 15 percent.

* TEMPERATURES: Highs in the 70s west of the Divide and the
mountains, in the 80s to near 90 in the lower basins east of the
Divide.