Cheyenne, Wyoming
Regional Weather Alerts
| 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: | 2026-08-10 @ 3:23 am -> 2026-08-10 @ 5:00 pm |
| Onset: | 2026-08-10 @ 1:00 pm -> 2026-08-10 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-08-10 @ 3:23 am |
| Headline: | Red Flag Warning issued August 10 at 2:23AM MDT until August 10 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 today to 9 PM MDT this evening. * IMPACTS: Low Humidities...Hot Temperatures...Strong Gusty Winds...and Dry Thunderstorms with gusty and erratic outflow 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: West 10 to 20 mph with gusts up to 30 mph. * THUNDERSTORMS: Wind gusts up to 55 mph will be possible from outflows. * HUMIDITY: As low as 15 percent. * TEMPERATURES: Highs in the middle 80s to near 90 degrees. |
| Alert: | Red Flag Warning |
| Area(s): | Natrona County/Casper BLM; Johnson County/Casper BLM; South Bighorn Mountains; Casper Mountain |
| Effective: | 2026-08-10 @ 3:23 am -> 2026-08-10 @ 5:00 pm |
| Onset: | 2026-08-10 @ 1:00 pm -> 2026-08-10 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-08-10 @ 3:23 am |
| Headline: | Red Flag Warning issued August 10 at 2:23AM MDT until August 10 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 today to 9 PM MDT this evening. * IMPACTS: Low Humidities...Hot Temperatures...Strong Gusty Winds...and Dry Thunderstorms with gusty and erratic outflow winds could cause erratic fire behavior. * AFFECTED AREA: In Central WY Fire Zones...280...285...300. In North Central WY Fire Zone....281. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Hot Springs...Johnson...Washakie. * WIND: West 10 to 20 mph with gusts up to 30 mph. * THUNDERSTORMS: Will have the best chances in zones 280, 289 and 300. Wind gusts up to 55 mph will be possible from outflows. * HUMIDITY: As low as 10 percent. * TEMPERATURES: Highs in the lower 90s; highs in the 80s in zones 285 and 300. |
| Alert: | Red Flag Warning |
| Area(s): | Upper Wind River Basin/Wind River Basin; Owl Creek Mountains; Granite/Green/Ferris/Rattlesnake Mountains |
| Effective: | 2026-08-10 @ 3:23 am -> 2026-08-10 @ 5:00 pm |
| Onset: | 2026-08-10 @ 1:00 pm -> 2026-08-10 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-08-10 @ 3:23 am |
| Headline: | Red Flag Warning issued August 10 at 2:23AM MDT until August 10 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 today to 9 PM MDT this evening. * IMPACTS: Low Humidities...Hot Temperatures...Strong Gusty Winds...and Dry Thunderstorms with gusty and erratic outflow winds could cause erratic fire behavior. * AFFECTED AREA: In Central WY Fire Zones...283...289. In North Central WY Fire Zone....287. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Hot Springs. In Southwest WY...Sweetwater. * WIND: West 10 to 20 mph with gusts up to 30 mph. * THUNDERSTORMS: Wind gusts up to 55 mph will be possible from outflows. * HUMIDITY: As low as 11 percent. * TEMPERATURES: Highs in the middle 90s; Highs around 90 in zone 287. |
| Alert: | Red Flag Warning |
| Area(s): | Absaroka Mountains/North Shoshone NF |
| Effective: | 2026-08-10 @ 3:23 am -> 2026-08-10 @ 5:00 pm |
| Onset: | 2026-08-10 @ 1:00 pm -> 2026-08-10 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-08-10 @ 3:23 am |
| Headline: | Red Flag Warning issued August 10 at 2:23AM MDT until August 10 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 today to 9 PM MDT this evening. * IMPACTS: Low Humidities...Hot Temperatures...Strong Gusty Winds...and Dry Thunderstorms with gusty and erratic outflow winds could cause erratic fire behavior. * AFFECTED AREA: In Northwest WY...Fire Weather Zone 286. * COUNTIES AFFECTED: In Central WY...Fremont. In North Central WY...Hot Springs...Park. * WIND: West 10 to 20 mph with gusts up to 35 mph. * THUNDERSTORMS: There is a 20 to 30% chance for virga showers/dry thunderstorms between 1500 and 2000. Wind gusts up to 55 mph will be possible from outflows. * HUMIDITY: As low as 15 percent. * TEMPERATURES: Highs in the upper 70s. |
| Alert: | Red Flag Warning |
| Area(s): | Fall River County Area; Northern Campbell; Southern Campbell; Crook County Plains; Weston County Plains |
| Effective: | 2026-08-10 @ 2:14 am -> 2026-08-10 @ 2:15 pm |
| Onset: | 2026-08-10 @ 1:00 pm -> 2026-08-10 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Rapid City SD on 2026-08-10 @ 2:14 am |
| Headline: | Red Flag Warning issued August 10 at 1:14AM MDT until August 10 at 9:00PM MDT by NWS Rapid City SD |
| Description: |
...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING DUE TO GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FALL RIVER COUNTY AREA, NORTHERN CAMPBELL, SOUTHERN CAMPBELL, CROOK COUNTY PLAINS, AND WESTON COUNTY PLAINS... The National Weather Service in Rapid City SD has issued a Red Flag Warning. * AFFECTED AREA...Fire Weather Zones 314, 315, 316, 317, and 322. * TIMING...From noon today to 9 PM MDT this evening. * WINDS...Northwest winds 10 to 15 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...Relative Humidity as low as 10%. * 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; North Laramie Range and Adjacent High Plains; North Laramie Valley/Shirley Basin; Ferris/Seminoe/Shirley Mountains; Central and West Carbon; Southwest Carbon County; Sierra Madre Range/Medicine Bow NF; Upper North Platte River Basin; Snowy Range/Medicine Bow NF; North Snowy Range Foothills |
| Effective: | 2026-08-10 @ 2:03 am -> 2026-08-10 @ 10:00 pm |
| Onset: | 2026-08-10 @ 1:00 pm -> 2026-08-10 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-08-10 @ 2:03 am |
| Headline: | Red Flag Warning issued August 10 at 1:03AM MDT until August 10 at 9:00PM MDT by NWS Cheyenne WY |
| Description: |
The National Weather Service in Cheyenne has issued a Red Flag Warning, which is in effect from noon today to 9 PM MDT this evening. * AFFECTED AREA...Fire weather zones 417 through 427. * WIND...West to northwest at 10 to 20 mph with gusts up to 35 mph. * HUMIDITY...Between 9 and 18 percent. * ADDITIONAL DETAILS...Isolated high-based showers will have the potential to produce gusty and erratic winds along with a few strikes of lightning without much, if any, rainfall during the afternoon and evening hours. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |
| Alert: | Evacuation - Immediate |
| Area(s): | Fremont, WY |
| Effective: | 2026-08-09 @ 9:25 pm -> 2026-08-10 @ 1:00 pm |
| Onset: | 2026-08-09 @ 9:25 pm |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Riverton WY on 2026-08-09 @ 9:25 pm |
| Headline: | Evacuation - Immediate issued August 9 at 8:25PM MDT by NWS Riverton WY |
| Description: |
EVIRIW The following message is transmitted at the request of the Fremont County Emergency Management. Due to a wildfire near Johnny Lee's Corner, an Immediate Evacuation is required for the following areas: Areas east of highway 28 and the entire Twin Creek Drainage south of highway 287 must evacuate immediately due to wildfire threat. Go to Fremont County Facebook page or County 10 News for updates. GO NOW! The following message is transmitted at the request of the Wyoming Office of Homeland Security. |
| Alert: | Air Quality Alert |
| Area(s): | Yellowstone National Park; Absaroka Mountains; Cody Foothills; North Bighorn Basin; Southwest Bighorn Basin; Southeast Bighorn Basin; Owl Creek and Bridger Mountains; Bighorn Mountains West; Bighorn Mountains Southeast; Northeast Johnson County; Southeast Johnson County; Teton and Gros Ventre Mountains; Jackson Hole; Wind River Mountains West; Wind River Mountains East; Upper Wind River Basin; Wind River Basin; Lander Foothills; Green Mountains and Rattlesnake Range; Natrona County Lower Elevations; Casper Mountain; Star Valley; Salt River and Wyoming Ranges; Upper Green River Basin Foothills; Upper Green River Basin; South Lincoln County; Rock Springs and Green River; Flaming Gorge; East Sweetwater County |
| Effective: | 2026-08-08 @ 12:39 pm -> 2026-08-10 @ 1:00 pm |
| Onset: | 2026-08-08 @ 12:39 pm |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Riverton WY on 2026-08-08 @ 12:39 pm |
| Headline: | Air Quality Alert issued August 8 at 11:39AM MDT by NWS Riverton WY |
| Description: |
The following message is transmitted on behalf of the Wyoming Department of Environmental Quality, Air Quality Division, and the Wyoming Department of Health. * WHAT...Air Quality Alert for Wildfire Smoke. * WHERE...All of Western and Central Wyoming * WHEN...Now through Noon Monday. * IMPACTS...Smoke from western United States wildfires continues to be observed across much of western and central Wyoming. The smoke is limiting visibilities at times. HEALTH INFORMATION...The Wyoming Department of Health recommends that the elderly, young children, and individuals with respiratory problems avoid excessive physical exertion and minimize outdoor activities during this time. Wildfire smoke is made up of a variety of pollutants, including particulate matter and ozone, which can cause respiratory health effects. Although these people are most susceptible to health impacts, the Department of Health also advises that everyone should avoid prolonged exposure to poor air quality conditions. CURRENT CONDITIONS...The Wyoming Department of Environmental Quality, Air Quality Division offers near real-time air quality data for Wyoming's monitoring stations and health effects information to help the public interpret current conditions. Current air quality conditions across the state of Wyoming can be found at http://www.wyvisnet.com/. |
| Alert: | Air Quality Alert |
| Area(s): | Northeast Bighorn Mountains; Sheridan Foothills |
| Effective: | 2026-08-07 @ 12:03 pm -> 2026-08-10 @ 1:00 pm |
| Onset: | 2026-08-07 @ 12:03 pm |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Billings MT on 2026-08-07 @ 12:03 pm |
| Headline: | Air Quality Alert issued August 7 at 11:03AM MDT by NWS Billings MT |
| Description: |
The following message is transmitted on behalf of the Wyoming Department of Environmental Quality, Air Quality Division and the Wyoming Department of Health. WHAT...Air Quality Alert for Wildfire Smoke. WHERE...Sheridan County, Wyoming. WHEN...Through noon Monday. IMPACTS...Heavy smoke from regional wildfires will continue to reduce air quality. HEALTH INFORMATION...The Wyoming Department of Health recommends the elderly, young children, and individuals with respiratory problems avoid excessive physical exertion and minimize outdoor activities during this time. Wildfire smoke is made up of a variety of pollutants, including particulate matter and ozone, which can cause respiratory health effects. Although these people are most susceptible to health impacts, the Department of Health also advises that everyone should avoid prolonged exposure to poor air quality conditions. CURRENT CONDITIONS...The Wyoming Department of Environmental Quality, Air Quality Division offers near real-time air quality data for Wyoming's monitoring stations and health effects information to help the public interpret current conditions. Current air quality conditions across the state of Wyoming can be found at http://www.wyvisnet.com/ |
| Alert: | Air Quality Alert |
| Area(s): | Southwest Wyoming |
| Effective: | 2026-08-07 @ 11:51 am -> 2026-08-10 @ 1:00 pm |
| Onset: | 2026-08-07 @ 11:51 am |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Salt Lake City UT on 2026-08-07 @ 11:51 am |
| Headline: | Air Quality Alert issued August 7 at 10:51AM MDT by NWS Salt Lake City UT |
| Description: |
The following is transmitted in collaboration with the Wyoming Department of Environmental Quality, Air Quality Division and the Wyoming Department of Health until noon MDT Monday. * WHAT...Air Quality Alert for Wildfire Smoke. * WHERE...Uinta County in southwest Wyoming. * WHEN...Noon MDT Friday through Noon MDT Monday * IMPACTS...Heavy smoke from the northwestern United States has been observed across southwest Wyoming. HEALTH INFORMATION...The Wyoming Department of Health recommends the elderly, young children, and individuals with respiratory problems avoid excessive physical exertion and minimize outdoor activities during this time. Wildfire smoke is made up of a variety of pollutants, including particulate matter and ozone, which can cause respiratory health effects. Although these people are most susceptible to health impacts, the Department of Health also advises that everyone should avoid prolonged exposure to poor air quality conditions. CURRENT CONDITIONS...The Wyoming Department of Environmental Quality, Air Quality Division offers near real-time air quality data for Wyoming's monitoring stations and provides health effects information to help the public interpret current conditions. Current air quality conditions across the state of Wyoming can be found at http://www.wyvisnet.com/ |
| Alert: | Air Quality Alert |
| Area(s): | Northern Campbell; Southern Campbell; Western Crook; Wyoming Black Hills; Weston County Plains; Newcastle; Northeastern Crook |
| Effective: | 2026-08-07 @ 11:46 am -> 2026-08-10 @ 1:00 pm |
| Onset: | 2026-08-07 @ 11:46 am |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Rapid City SD on 2026-08-07 @ 11:46 am |
| Headline: | Air Quality Alert issued August 7 at 10:46AM MDT by NWS Rapid City SD |
| Description: |
The following message is transmitted in collaboration with the Wyoming Department of Environmental Quality, Air Quality Division, and the Wyoming Department of Health. * WHAT...Air Quality Alert for Wildfire Smoke. * WHERE...Northeast Wyoming. * WHEN...Through Noon MDT Monday. * IMPACTS...Poor air quality due to wildfire smoke. |