Cheyenne, Wyoming
Regional Weather Alerts
| 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: | 2026-09-04 @ 2:35 pm -> 2026-09-04 @ 10:00 pm |
| Onset: | 2026-09-04 @ 2:35 pm -> 2026-09-04 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-09-04 @ 2:35 pm |
| Headline: | Red Flag Warning issued September 4 at 1:35PM MDT until September 4 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...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 35 mph. * HUMIDITY: As low as 9 to 15 percent. * TEMPERATURES: Highs in the mid 80s to low 90s. |
| 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): | Butte County Area; Northern Campbell; Southern Campbell; Crook County Plains; Weston County Plains; Wyoming Black Hills |
| Effective: | 2026-09-03 @ 10:19 pm -> 2026-09-04 @ 10:30 am |
| Onset: | 2026-09-04 @ 12:00 pm -> 2026-09-04 @ 9:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Rapid City SD on 2026-09-03 @ 10:19 pm |
| Headline: | Red Flag Warning issued September 3 at 9:19PM MDT until September 4 at 8:00PM MDT by NWS Rapid City SD |
| Description: |
...RED FLAG WARNING IN EFFECT FROM 11 AM TO 8 PM MDT FRIDAY DUE TO GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR BUTTE COUNTY AREA, NORTHERN CAMPBELL, SOUTHERN CAMPBELL, CROOK COUNTY PLAINS, WESTON COUNTY PLAINS, AND WYOMING BLACK HILLS... The National Weather Service in Rapid City SD has issued a Red Flag Warning. * AFFECTED AREA...Fire Weather Zones 314, 315, 316, 317, 318, and 327. * TIMING...From 11 AM to 8 PM MDT Friday. * WINDS...South 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. |