Cheyenne, Wyoming
Regional Weather Alerts
| Alert: | Red Flag Warning |
| Area(s): | Northern Campbell; Southern Campbell; Crook County Plains; Weston County Plains |
| Effective: | 2026-07-12 @ 3:00 pm -> 2026-07-12 @ 10:00 pm |
| Onset: | 2026-07-12 @ 3:00 pm -> 2026-07-12 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Rapid City SD on 2026-07-12 @ 3:00 pm |
| Headline: | Red Flag Warning issued July 12 at 2:00PM MDT until July 12 at 9:00PM MDT by NWS Rapid City SD |
| Description: |
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT TUESDAY DUE TO GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FALL RIVER COUNTY AREA, NORTHERN FOOT HILLS, EASTERN FOOT HILLS, CUSTER COUNTY PLAINS, PINE RIDGE AREA, BUTTE COUNTY AREA, PERKINS COUNTY, WEST CENTRAL PLAINS, ZIEBACH COUNTY, HAAKON COUNTY AREA, AND BADLANDS AREA... ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING DUE TO GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR NORTHERN CAMPBELL, SOUTHERN CAMPBELL, CROOK COUNTY PLAINS, AND WESTON COUNTY PLAINS... ... * AFFECTED AREA...Fire Weather Zones 314, 315, 316, and 317. * TIMING...Until 9 PM MDT this evening. * WINDS...Southeast winds 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...Relative Humidity as low as 6 percent. * IMPACTS...Any fires that develop will spread rapidly. Outdoor burning is not recommended. |
| 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; Northern Rosebud/Northern Treasure Counties; Northern Cheyenne Indian Reservation/Ashland Ranger District Custer Natl Forest; Custer County; Sioux Ranger District Custer National Forest; Sheridan County/Casper BLM |
| Effective: | 2026-07-12 @ 2:22 pm -> 2026-07-12 @ 10:00 pm |
| Onset: | 2026-07-12 @ 2:22 pm -> 2026-07-12 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-12 @ 2:22 pm |
| Headline: | Red Flag Warning issued July 12 at 1:22PM MDT until July 12 at 9:00PM MDT by NWS Billings MT |
| Description: |
* IMPACTS: Low humidities, hot temperatures, and gusty winds will create erratic fire behavior and new fire starts. * AFFECTED AREA: In North Central WY Fire Zone...274. In South Central MT Fire Zones...123...124...125...126...127 128...129. In Southeast MT Fire Zones...130...131...132. In Southeast MT and Northwest SD Fire Zone...133. * COUNTIES AFFECTED: In Central MT...Golden Valley...Musselshell...Wheatland. In North Central WY...Sheridan. In Northwest SD...Harding. In South Central MT...Big Horn...Carbon...Park...Stillwater Sweet Grass...Yellowstone. In Southeast MT...Carter...Custer...Fallon...Powder River Rosebud...Treasure. In Southwest MT...Gallatin. * WIND: South 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: Minimums of 5 to 10 percent. * TEMPERATURES: 105 to 112. * COLD FRONT: Arrives over south central Montana this evening, bringing a shift to breezy northwest winds. The front will reach far southeast Montana early Monday morning. Before the frontal passage, a southeasterly low level jet will produce gusty ridgetop winds (up to 40 mph) and a slow humidity recovery over southeast Montana tonight. |
| Alert: | Extreme Heat Warning |
| Area(s): | Custer; Fallon; Powder River; Carter; Southern Rosebud; Sheridan Foothills |
| Effective: | 2026-07-12 @ 1:54 pm -> 2026-07-13 @ 2:00 pm |
| Onset: | 2026-07-12 @ 1:54 pm -> 2026-07-16 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-12 @ 1:54 pm |
| Headline: | Extreme Heat Warning issued July 12 at 12:54PM MDT until July 16 at 12:00AM MDT by NWS Billings MT |
| Description: |
* WHAT...Extremely hot daytime temperatures combined with warm overnight low temperatures will produce cumulative heat stress. * WHERE...Portions of southeast Montana and north central Wyoming. * WHEN...Until midnight MDT Wednesday Night. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Dangerously hot conditions with temperatures of 104 to 112 today. Highs temperatures Monday through Wednesday will range from 100 to 105. Overnight lows will remain well above normal. |
| Alert: | Red Flag Warning |
| Area(s): | Pine Ridge/Nebraska National Forest; Niobrara/Lower Elevations of Converse/Thunder Basin National Grassland; Middle North Platte River Basin/Niobrara and Converse High Plains; North Laramie Range and Adjacent High Plains; North Laramie Valley/Shirley Basin; Southwest Carbon County; North Snowy Range Foothills; Laramie Foothills and High Plains; Laramie East High Plains; Bordeaux/Chugwater/Wheatland; Goshen/Middle-Lower North Platte River Basin |
| Effective: | 2026-07-12 @ 1:49 pm -> 2026-07-13 @ 7:00 am |
| Onset: | 2026-07-12 @ 1:49 pm -> 2026-07-13 @ 9:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-07-12 @ 1:49 pm |
| Headline: | Red Flag Warning issued July 12 at 12:49PM MDT until July 13 at 8:00PM MDT by NWS Cheyenne WY |
| Description: |
The National Weather Service in Cheyenne has cancelled the Fire Weather Watch. The Red Flag Warning remains in effect for Sunday and Monday. * AFFECTED AREA...Fire weather zones 417, 418, 423, and 430 through 434. * WIND...South 10 to 15 mph gusting 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: | Heat Advisory |
| Area(s): | Dawes; Box Butte; Scotts Bluff; Banner; Morrill; Kimball; Cheyenne; North Sioux; South Sioux; Converse County Lower Elevations; Niobrara County; East Platte County; Goshen County; Central Laramie County; East Laramie County |
| Effective: | 2026-07-12 @ 1:47 pm -> 2026-07-13 @ 7:00 am |
| Onset: | 2026-07-12 @ 1:47 pm -> 2026-07-15 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-07-12 @ 1:47 pm |
| Headline: | Heat Advisory issued July 12 at 12:47PM MDT until July 15 at 12:00AM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Afternoon temperatures will be near or exceed 100 degrees with overnight temperatures dipping to between 65 to 70, providing little relief. * WHERE...Portions of panhandle Nebraska and east central and southeast Wyoming. * WHEN...Until midnight MDT Tuesday Night. * IMPACTS...Hot temperatures and poor hydration may cause heat illnesses or injuries. |
| Alert: | Heat Advisory |
| Area(s): | Harding; Northern Perkins; Butte; Northern Meade Co Plains; Ziebach; Northern Foothills; Rapid City; Southern Foothills; Custer Co Plains; Pennington Co Plains; Haakon; Western Fall River; Northern Oglala Lakota; Northern Jackson; Bennett; Mellette; Todd; Tripp; Sturgis/Piedmont Foothills; Southern Meade Co Plains; Hermosa Foothills; Eastern Fall River; Southern Oglala Lakota; Southern Jackson; Southern Perkins; Northern Campbell; Southern Campbell; Western Crook; Weston County Plains; Newcastle; Northeastern Crook |
| Effective: | 2026-07-12 @ 12:31 pm -> 2026-07-13 @ 7:15 am |
| Onset: | 2026-07-12 @ 12:31 pm -> 2026-07-16 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Rapid City SD on 2026-07-12 @ 12:31 pm |
| Headline: | Heat Advisory issued July 12 at 11:31AM MDT until July 16 at 9:00PM MDT by NWS Rapid City SD |
| Description: |
* WHAT...Heat index values up to 105. * WHERE...Portions of northwestern, south central, and southwestern South Dakota and northeast Wyoming. * WHEN...Until 9 PM MDT /10 PM CDT/ Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. |
| Alert: | Extreme Heat Warning |
| Area(s): | Cody Foothills; North Bighorn Basin; Southwest Bighorn Basin; Southeast Bighorn Basin; Northeast Johnson County; Southeast Johnson County; Jackson Hole; Upper Wind River Basin; Wind River Basin; Lander Foothills; Green Mountains and Rattlesnake Range; Natrona County Lower Elevations; Star Valley; Upper Green River Basin Foothills; Upper Green River Basin; South Lincoln County; Rock Springs and Green River; Flaming Gorge; East Sweetwater County |
| Effective: | 2026-07-12 @ 12:10 pm -> 2026-07-13 @ 8:00 am |
| Onset: | 2026-07-12 @ 12:10 pm -> 2026-07-14 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-07-12 @ 12:10 pm |
| Headline: | Extreme Heat Warning issued July 12 at 11:10AM MDT until July 14 at 9:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Dangerously hot conditions with temperatures from 100 to 110 degrees below 6,000 feet and 90 to 100 degrees between 6,000 and 7,000 feet each day. * WHERE...Portions of central, north central, northwest, south central, southwest, and west central Wyoming. * WHEN...Until 9 PM MDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. |
| Alert: | Extreme Heat Warning |
| Area(s): | Southwest Wyoming |
| Effective: | 2026-07-12 @ 11:49 am -> 2026-07-13 @ 3:00 am |
| Onset: | 2026-07-12 @ 11:49 am -> 2026-07-13 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Salt Lake City UT on 2026-07-12 @ 11:49 am |
| Headline: | Extreme Heat Warning issued July 12 at 10:49AM MDT until July 13 at 9:00PM MDT by NWS Salt Lake City UT |
| Description: |
* WHAT...Dangerously hot conditions with temperatures up to 98 degrees expected. * WHERE...Southwest Wyoming. * WHEN...Until 9 PM MDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...There is high confidence that temperatures will warm to values challenging daily, monthly, or even all-time high temperature records Sunday and Monday. |
| 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 |
| Effective: | 2026-07-12 @ 1:33 am -> 2026-07-12 @ 11:00 pm |
| Onset: | 2026-07-12 @ 12:00 pm -> 2026-07-12 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-07-12 @ 1:33 am |
| Headline: | Red Flag Warning issued July 12 at 12:33AM MDT until July 12 at 10:00PM MDT by NWS Riverton WY |
| Description: |
* IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty Winds could cause erratic fire behavior. * AFFECTED AREA: In Central WY Fire Zones...280...283. In North Central WY Fire Zones...275...276...281...282. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Big Horn...Hot Springs...Johnson...Park Washakie. * WIND: Southeast 15 to 25 mph with gusts up to 35 mph. * HUMIDITY: As low as 4 percent. * TEMPERATURES: Highs 98 to 110. |