Cheyenne, Wyoming
Regional Weather Alerts
| Alert: | Red Flag Warning |
| Area(s): | Pine Ridge/Nebraska National Forest; Box Butte/South Sioux/Niobrara River; Lower North Platte River Basin/Scottsbluff National Monument; Lodgepole Creek/Southern Nebraska Panhandle; 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; Laramie Foothills and High Plains; Laramie East High Plains; Bordeaux/Chugwater/Wheatland; Goshen/Middle-Lower North Platte River Basin |
| Effective: | 2026-03-21 @ 2:30 am -> 2026-03-21 @ 9:00 pm |
| Onset: | 2026-03-21 @ 2:30 am -> 2026-03-21 @ 4:30 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-03-21 @ 2:30 am |
| Headline: | Red Flag Warning issued March 21 at 1:30AM MDT until March 21 at 8:00PM MDT by NWS Cheyenne WY |
| Description: |
* AFFECTED AREA...Fire weather zone 417, 418, 419, 430, 431, 432, 433, 434, 435, 436, and 437. * WIND...Sustained winds 15 to 25 mph, gusting up to 35 mph. * HUMIDITY...7 to 12 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. * ADDITIONAL DETAILS...Poor overnight humidity recoveries are expected early Saturday morning. Well above average temperatures are also expected which will contribute considerably to the dry conditions. |
| Alert: | Red Flag Warning |
| Area(s): | North Laramie Valley/Shirley Basin; Ferris/Seminoe/Shirley Mountains; Central and West Carbon; Southwest Carbon County; Upper North Platte River Basin; North Snowy Range Foothills; Southern Laramie Valley; Southern Laramie Range |
| Effective: | 2026-03-21 @ 2:30 am -> 2026-03-21 @ 9:00 pm |
| Onset: | 2026-03-21 @ 2:30 am -> 2026-03-21 @ 4:30 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-03-21 @ 2:30 am |
| Headline: | Red Flag Warning issued March 21 at 1:30AM MDT until March 21 at 8:00PM MDT by NWS Cheyenne WY |
| Description: |
* AFFECTED AREA...Fire weather zone 420, 421, 422, 423, 425, 427,428 and 429. * WIND...Sustained winds 20 to 30 mph, gusting up to 40 mph. * HUMIDITY...9 to 12 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. * ADDITIONAL DETAILS...Poor overnight humidity recoveries are expected early Saturday morning. Well above average temperatures are also expected which will contribute considerably to the dry conditions. |
| Alert: | Red Flag Warning |
| Area(s): | Cody Foothills; South Bighorn Basin/Worland BLM; Upper Wind River Basin/Wind River Basin; Owl Creek Mountains |
| Effective: | 2026-03-21 @ 1:35 am -> 2026-03-21 @ 10:00 pm |
| Onset: | 2026-03-21 @ 1:35 am -> 2026-03-21 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-03-21 @ 1:35 am |
| Headline: | Red Flag Warning issued March 21 at 12:35AM MDT until March 21 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 Zone....283. In North Central WY Fire Zones...276...282...287. * COUNTIES AFFECTED: In Central WY...Fremont. In North Central WY...Hot Springs...Park...Washakie. * WIND: Southwest 20 to 30 mph with gusts up to 50 mph, with the strongest wind in Zones 276, 283 and 287. * HUMIDITY: 8 to 14 percent. * TEMPERATURES: Highs in the upper 70s to mid 80s. |
| Alert: | Red Flag Warning |
| Area(s): | North Bighorn Basin/Worland BLM |
| Effective: | 2026-03-21 @ 1:35 am -> 2026-03-21 @ 10:00 pm |
| Onset: | 2026-03-21 @ 12:00 pm -> 2026-03-21 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-03-21 @ 1:35 am |
| Headline: | Red Flag Warning issued March 21 at 12:35AM MDT until March 21 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 11 AM this morning to 9 PM MDT this evening. * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds could cause erratic fire behavior. * AFFECTED AREA: In North Central WY...Fire Weather Zone 275. * COUNTIES AFFECTED: In North Central WY...Big Horn...Park. * WIND: West 20 to 30 mph with gusts up to 45 mph, becoming northwest at similar speeds late this afternoon and evening. * HUMIDITY: As low as 12 percent. * TEMPERATURES: Highs in the upper 70s to lower 80s. |
| Alert: | Red Flag Warning |
| Area(s): | Natrona County/Casper BLM; Johnson County/Casper BLM; Granite/Green/Ferris/Rattlesnake Mountains |
| Effective: | 2026-03-21 @ 1:35 am -> 2026-03-21 @ 10:00 pm |
| Onset: | 2026-03-21 @ 1:35 am -> 2026-03-21 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-03-21 @ 1:35 am |
| Headline: | Red Flag Warning issued March 21 at 12:35AM MDT until March 21 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...289. In North Central WY Fire Zone....281. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Johnson. In Southwest WY...Sweetwater. * WIND: Southwest 20 to 30 mph with gusts up to 45 mph. * HUMIDITY: 9 to 15 percent. * TEMPERATURES: Highs in the upper 70s to mid 80s. |
| 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 |
| Effective: | 2026-03-21 @ 1:35 am -> 2026-03-21 @ 10:00 pm |
| Onset: | 2026-03-21 @ 1:35 am -> 2026-03-21 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-03-21 @ 1:35 am |
| Headline: | Red Flag Warning issued March 21 at 12:35AM MDT until March 21 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 Southwest WY Fire Zones...277...279. In West Central WY Fire Zone....278. * COUNTIES AFFECTED: In Southwest WY...Sweetwater...Uinta. In West Central WY...Lincoln...Sublette. * WIND: Southwest 15 to 25 mph with gusts up to 40 mph. * HUMIDITY: 8 to 14 percent. * TEMPERATURES: Highs in the 70s. |
| Alert: | Red Flag Warning |
| Area(s): | Northern Black Hills; Central Black Hills; Southern Black Hills; Fall River County Area; Northern Foot Hills; Eastern Foot Hills; Custer County Plains; Pine Ridge Area; Badlands Area; Bennett County Area; Northern Campbell; Southern Campbell; Crook County Plains; Weston County Plains; Wyoming Black Hills |
| Effective: | 2026-03-20 @ 8:15 pm -> 2026-03-21 @ 10:00 pm |
| Onset: | 2026-03-20 @ 8:15 pm -> 2026-03-21 @ 11:15 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Rapid City SD on 2026-03-20 @ 8:15 pm |
| Headline: | Red Flag Warning issued March 20 at 7:15PM MDT until March 21 at 9:00PM MDT by NWS Rapid City SD |
| Description: |
...CRITICAL FIRE WEATHER CONDITIONS THROUGH SATURDAY FOR MUCH OF NORTHEASTERN WYOMING AND WESTERN SOUTH DAKOTA... .Very poor RH recovery tonight for northeastern Wyoming, the Black Hills and foothills, and southwestern South Dakota. The Red Flag Warning remains in effect overnight through Saturday afternoon for these areas. Extremely warm conditions Saturday with highs pushing into the 80s and low 90s and humidity falling into the single digits, particularly along and south of I90. The Red Flag Warning has been extended into the Meade County plains, Haakon County, and south-central South Dakota. A cold front will move through Saturday evening with breezy northerly winds expected and rising RH. * AFFECTED AREA...Fire Weather Zones 314 Northern Campbell, 315 Southern Campbell, 316 Crook County Plains, 317 Weston County Plains, 318 Wyoming Black Hills, 319 Northern Black Hills, 320 Central Black Hills, 321 Southern Black Hills, 322 Fall River County Area, 323 Northern Foot Hills, 324 Eastern Foot Hills, 325 Custer County Plains, 326 Pine Ridge Area, 332 Badlands Area and 333 Bennett County Area. * WINDS...Southwest 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...The combination of gusty winds and low relative humidity will produce critical fire weather conditions. |