Cheyenne, Wyoming

Regional Weather Alerts


     

Alert: Red Flag Warning
Area(s): Crow Indian Reservation/Big Horn Canyon Rec Area; Bighorn National Forest
Effective: 2026-09-03 @ 3:19 pm -> 2026-09-04 @ 3:30 pm
Onset: 2026-09-03 @ 3:19 pm -> 2026-09-03 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-09-03 @ 3:19 pm
Headline: Red Flag Warning issued September 3 at 2:19PM 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 9 AM to 9 PM MDT Friday.

* IMPACTS: Low humidities, unseasonably warm temperatures, and
strong gusty winds will create erratic fire behavior.

* AFFECTED AREA:
In North Central WY Fire Zone...284.
In South Central MT Fire Zone...129.

* COUNTIES AFFECTED:
In North Central WY...Big Horn...Johnson...Sheridan...Washakie.
In South Central MT...Big Horn...Carbon...Yellowstone.

* WIND: South 10 to 20 mph with gusts 25 to 35 mph.

* HUMIDITY: As low as 10 percent.

* ADDITIONAL DETAILS: The worst conditions are expected across the
lower elevations.

* TEMPERATURES: Up to 96.

Alert: Red Flag Warning
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 @ 3:19 pm -> 2026-09-04 @ 3:30 pm
Onset: 2026-09-04 @ 10:00 am -> 2026-09-04 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-09-03 @ 3:19 pm
Headline: Red Flag Warning issued September 3 at 2:19PM MDT until September 4 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 Friday. The
Fire Weather Watch is no longer in effect.

* IMPACTS: Low humidities, unseasonably warm 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: South 10 to 20 mph with gusts 25 to 35 mph.

* HUMIDITY: As low as 10 percent.

* TEMPERATURES: in the 90s.

Alert: Red Flag Warning
Area(s): Crow Indian Reservation/Big Horn Canyon Rec Area; Bighorn National Forest
Effective: 2026-09-03 @ 3:19 pm -> 2026-09-04 @ 3:30 pm
Onset: 2026-09-04 @ 10:00 am -> 2026-09-04 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-09-03 @ 3:19 pm
Headline: Red Flag Warning issued September 3 at 2:19PM MDT until September 4 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 Friday.

* IMPACTS: Low humidities, unseasonably warm temperatures, and
strong gusty winds will create erratic fire behavior.

* AFFECTED AREA:
In North Central WY Fire Zone...284.
In South Central MT Fire Zone...129.

* COUNTIES AFFECTED:
In North Central WY...Big Horn...Johnson...Sheridan...Washakie.
In South Central MT...Big Horn...Carbon...Yellowstone.

* WIND: South 10 to 20 mph with gusts 25 to 35 mph.

* HUMIDITY: As low as 10 percent.

* ADDITIONAL DETAILS: The worst conditions are expected across the
lower elevations.

* TEMPERATURES: Up to 96.

Alert: Red Flag Warning
Area(s): Lincoln and Uinta Counties/Lower Elevations; Upper Green River Basin/Rock Springs BLM; Sweetwater County/Rock Springs BLM/Flaming Gorge NRA; East Wind River Mountains/South Shoshone NF; Casper Mountain
Effective: 2026-09-03 @ 12:12 pm -> 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 Riverton WY on 2026-09-03 @ 12:12 pm
Headline: Red Flag Warning issued September 3 at 11:12AM 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...288...300.
In Southwest WY Fire Zones...277...279.
In West Central WY Fire Zone....278.

* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In Southwest WY...Sweetwater...Uinta.
In West Central WY...Lincoln...Sublette.

* WIND: Southwest 15 to 25 mph with gusts up to 30 to 40 mph.

* HUMIDITY: As low as 10 to 15 percent.

* TEMPERATURES: Highs in the 70s west of the Divide, and in the 80s
to the east.

Alert: Red Flag Warning
Area(s): North Bighorn Basin/Worland BLM; Cody Foothills; 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; Granite/Green/Ferris/Rattlesnake Mountains
Effective: 2026-09-03 @ 12:12 pm -> 2026-09-04 @ 8:00 am
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 @ 12:12 pm
Headline: Red Flag Warning issued September 3 at 11:12AM MDT until September 3 at 9:00PM MDT by NWS Riverton WY
Description: The National Weather Service in Riverton has issued a Red Flag
Warning, which is in effect from noon to 9 PM MDT Friday.

* 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...289.
In North Central WY Fire Zones...275...276...281...282...287.
In Northwest WY Fire Zone....286.

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

* WIND: Southwest 15 to 25 mph with gusts up to 30 to 40 mph.

* HUMIDITY: As low as 10 to 15 percent.

* TEMPERATURES: Highs in the 80s. Lows in the 50s.

Alert: Red Flag Warning
Area(s): North Bighorn Basin/Worland BLM; Cody Foothills; 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; Granite/Green/Ferris/Rattlesnake Mountains
Effective: 2026-09-03 @ 12:12 pm -> 2026-09-04 @ 8:00 am
Onset: 2026-09-04 @ 1:00 pm -> 2026-09-04 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Riverton WY on 2026-09-03 @ 12:12 pm
Headline: Red Flag Warning issued September 3 at 11:12AM MDT until September 4 at 9:00PM MDT by NWS Riverton WY
Description: The National Weather Service in Riverton has issued a Red Flag
Warning, which is in effect from noon to 9 PM MDT Friday.

* 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...289.
In North Central WY Fire Zones...275...276...281...282...287.
In Northwest WY Fire Zone....286.

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

* WIND: Southwest 15 to 25 mph with gusts up to 30 to 40 mph.

* HUMIDITY: As low as 10 to 15 percent.

* TEMPERATURES: Highs in the 80s. Lows in the 50s.