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. |