Cheyenne, Wyoming

Regional Weather Alerts


     

Alert: Red Flag Warning
Area(s): Fall River County Area; Butte County Area; Northern Campbell; Southern Campbell; Crook County Plains; Weston County Plains
Effective: 2026-08-06 @ 8:45 pm -> 2026-08-06 @ 9:45 pm
Onset: 2026-08-06 @ 8:45 pm -> 2026-08-06 @ 9:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Rapid City SD on 2026-08-06 @ 8:45 pm
Headline: Red Flag Warning issued August 6 at 7:45PM MDT until August 6 at 8:00PM MDT by NWS Rapid City SD
Description: The gusty winds have decreased and the relative humidity has
increased above critical levels. Hence, the Red Flag Warning will be
allowed to expire.

Alert: Red Flag Warning
Area(s): Southwest Carbon County; Sierra Madre Range/Medicine Bow NF
Effective: 2026-08-06 @ 8:39 pm -> 2026-08-06 @ 9:45 pm
Onset: 2026-08-06 @ 8:39 pm -> 2026-08-06 @ 9:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Cheyenne WY on 2026-08-06 @ 8:39 pm
Headline: Red Flag Warning issued August 6 at 7:39PM MDT until August 6 at 8:00PM MDT by NWS Cheyenne WY
Description: Humidity values have started to improve this evening, with winds
slowly decreasing. Therefore, the Red Flag Warning will expire on
time at 8 PM.

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; Southern Laramie Valley; Southern Laramie Range; Laramie Foothills and High Plains
Effective: 2026-08-06 @ 8:39 pm -> 2026-08-06 @ 9:45 pm
Onset: 2026-08-06 @ 8:39 pm -> 2026-08-06 @ 9:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Cheyenne WY on 2026-08-06 @ 8:39 pm
Headline: Red Flag Warning issued August 6 at 7:39PM MDT until August 6 at 8:00PM MDT by NWS Cheyenne WY
Description: Humidity values have started to improve this evening, with winds
slowly decreasing. Therefore, the Red Flag Warning will expire on
time at 8 PM.

Alert: Red Flag Warning
Area(s): North Laramie Valley/Shirley Basin
Effective: 2026-08-06 @ 8:39 pm -> 2026-08-07 @ 7:00 am
Onset: 2026-08-06 @ 8:39 pm -> 2026-08-06 @ 9:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Cheyenne WY on 2026-08-06 @ 8:39 pm
Headline: Red Flag Warning issued August 6 at 7:39PM MDT until August 6 at 8:00PM MDT by NWS Cheyenne WY
Description: ...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR GUSTY
WINDS, LOW HUMIDITY, AND POOR OVERNIGHT RECOVERIES FOR FIRE
WEATHER ZONE 420...

The National Weather Service in Cheyenne has issued a Red Flag
Warning, which is in effect from 11 AM to 8 PM MDT Friday.

* AFFECTED AREA...Fire weather zone 420.

* WIND...West winds from 15 to 25 mph with gusts up to 35 mph.

* HUMIDITY...Daytime minimum RH between 5 and 10 percent.
Recoveries tonight from 30 to 35 percent.

* IMPACTS...Any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.

Alert: Red Flag Warning
Area(s): Ferris/Seminoe/Shirley Mountains; Central and West Carbon; Upper North Platte River Basin; Snowy Range/Medicine Bow NF; North Snowy Range Foothills
Effective: 2026-08-06 @ 8:39 pm -> 2026-08-07 @ 7:00 am
Onset: 2026-08-06 @ 8:39 pm -> 2026-08-06 @ 9:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Cheyenne WY on 2026-08-06 @ 8:39 pm
Headline: Red Flag Warning issued August 6 at 7:39PM MDT until August 6 at 8:00PM MDT by NWS Cheyenne WY
Description: ...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR GUSTY
WINDS, LOW HUMIDITY, AND POOR OVERNIGHT RECOVERIES FOR FIRE
WEATHER ZONES 421, 422, 425, 426, AND 427...

The National Weather Service in Cheyenne has issued a Red Flag
Warning, which is in effect from 11 AM to 8 PM MDT Friday.

* AFFECTED AREA...Fire weather zones 421, 422, 425, 426,
and 427...

* WIND...West to northwest winds from 15 to 25 mph with gusts up
to 35 mph.

* HUMIDITY...Daytime minimum RH between 5 and 10 percent.
Recoveries tonight from 15 to 30 percent.

* IMPACTS...Any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.

Alert: Red Flag Warning
Area(s): North Laramie Valley/Shirley Basin
Effective: 2026-08-06 @ 8:39 pm -> 2026-08-07 @ 7:00 am
Onset: 2026-08-07 @ 12:00 pm -> 2026-08-07 @ 9:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Cheyenne WY on 2026-08-06 @ 8:39 pm
Headline: Red Flag Warning issued August 6 at 7:39PM MDT until August 7 at 8:00PM MDT by NWS Cheyenne WY
Description: ...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR GUSTY
WINDS, LOW HUMIDITY, AND POOR OVERNIGHT RECOVERIES FOR FIRE
WEATHER ZONE 420...

The National Weather Service in Cheyenne has issued a Red Flag
Warning, which is in effect from 11 AM to 8 PM MDT Friday.

* AFFECTED AREA...Fire weather zone 420.

* WIND...West winds from 15 to 25 mph with gusts up to 35 mph.

* HUMIDITY...Daytime minimum RH between 5 and 10 percent.
Recoveries tonight from 30 to 35 percent.

* IMPACTS...Any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.

Alert: Red Flag Warning
Area(s): Ferris/Seminoe/Shirley Mountains; Central and West Carbon; Upper North Platte River Basin; Snowy Range/Medicine Bow NF; North Snowy Range Foothills
Effective: 2026-08-06 @ 8:39 pm -> 2026-08-07 @ 7:00 am
Onset: 2026-08-07 @ 12:00 pm -> 2026-08-07 @ 9:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Cheyenne WY on 2026-08-06 @ 8:39 pm
Headline: Red Flag Warning issued August 6 at 7:39PM MDT until August 7 at 8:00PM MDT by NWS Cheyenne WY
Description: ...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR GUSTY
WINDS, LOW HUMIDITY, AND POOR OVERNIGHT RECOVERIES FOR FIRE
WEATHER ZONES 421, 422, 425, 426, AND 427...

The National Weather Service in Cheyenne has issued a Red Flag
Warning, which is in effect from 11 AM to 8 PM MDT Friday.

* AFFECTED AREA...Fire weather zones 421, 422, 425, 426,
and 427...

* WIND...West to northwest winds from 15 to 25 mph with gusts up
to 35 mph.

* HUMIDITY...Daytime minimum RH between 5 and 10 percent.
Recoveries tonight from 15 to 30 percent.

* IMPACTS...Any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.

Alert: Fire Weather Watch
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; Sheridan County/Casper BLM; Bighorn National Forest
Effective: 2026-08-06 @ 1:32 pm -> 2026-08-07 @ 1:45 pm
Onset: 2026-08-08 @ 12:00 pm -> 2026-08-08 @ 10:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Billings MT on 2026-08-06 @ 1:32 pm
Headline: Fire Weather Watch issued August 6 at 12:32PM MDT until August 8 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 Saturday morning through Saturday
evening.

* IMPACTS: Low humidities, hot temperatures, and strong gusty winds
will create erratic fire behavior.

* AFFECTED AREA:
In North Central WY Fire Zones...274...284.
In South Central MT Fire Zones...123...124...125...126...127
128...129.
In Southeast MT Fire Zones...130...131.

* 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 Southeast MT...Powder River...Rosebud...Treasure.
In Southwest MT...Gallatin.

* WIND: Northwest 10 to 20 mph with gusts up to 30 mph.

* HUMIDITY: Minimums of 9 to 14 percent.

* TEMPERATURES: Highs in the 90s to near 100 degrees.

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; Upper Wind River Basin; Wind River Basin; Lander Foothills
Effective: 2026-08-06 @ 12:28 pm -> 2026-08-07 @ 12:00 pm
Onset: 2026-08-06 @ 12:28 pm
Severity: Unknown
Certainty: Unknown
Urgency: Unknown
Issued By: NWS Riverton WY on 2026-08-06 @ 12:28 pm
Headline: Air Quality Alert issued August 6 at 11:28AM 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...Portions of northern and central Wyoming.

* WHEN...11 AM MDT Thursday through 11 AM MDT Friday.

* IMPACTS...Smoke from wildfires across the Pacific Northwest will
move over Wyoming and limit visibilities and lead to poor air
quality.

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: 2026-08-06 @ 12:11 pm -> 2026-08-07 @ 1:00 pm
Onset: 2026-08-06 @ 12:11 pm
Severity: Unknown
Certainty: Unknown
Urgency: Unknown
Issued By: NWS Billings MT on 2026-08-06 @ 12:11 pm
Headline: Air Quality Alert issued August 6 at 11:11AM 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 11am Friday.

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): Northern Campbell; Southern Campbell; Western Crook; Wyoming Black Hills; Weston County Plains; Newcastle; Northeastern Crook
Effective: 2026-08-06 @ 11:36 am -> 2026-08-07 @ 12:00 pm
Onset: 2026-08-06 @ 11:36 am
Severity: Unknown
Certainty: Unknown
Urgency: Unknown
Issued By: NWS Rapid City SD on 2026-08-06 @ 11:36 am
Headline: Air Quality Alert issued August 6 at 10:36AM 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 11 AM MDT Friday.

* IMPACTS...Poor air quality due to wildfire smoke.

Alert: Air Quality Alert
Area(s): Northern Campbell; Southern Campbell; Western Crook; Wyoming Black Hills; Weston County Plains; Newcastle; Northeastern Crook
Effective: 2026-08-06 @ 11:32 am -> 2026-08-06 @ 11:45 pm
Onset: 2026-08-06 @ 11:32 am
Severity: Unknown
Certainty: Unknown
Urgency: Unknown
Issued By: NWS Rapid City SD on 2026-08-06 @ 11:32 am
Headline: Air Quality Alert issued August 6 at 10:32AM 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...11 AM MDT Thursday through 11 AM MDT Friday.

* IMPACTS...Poor air quality due to wildfire smoke.

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: 2026-08-06 @ 2:51 am -> 2026-08-06 @ 10:00 pm
Onset: 2026-08-06 @ 1:00 pm -> 2026-08-06 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Riverton WY on 2026-08-06 @ 2:51 am
Headline: Red Flag Warning issued August 6 at 1:51AM MDT until August 6 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...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: Northwest 10 to 20 mph with gusts up to 30 mph.

* HUMIDITY: As low as 6 percent.

* TEMPERATURES: Highs in the upper 80s to lower 90s.

Alert: Red Flag Warning
Area(s): Natrona County/Casper BLM; Johnson County/Casper BLM; Upper Wind River Basin/Wind River Basin; Granite/Green/Ferris/Rattlesnake Mountains; Casper Mountain
Effective: 2026-08-06 @ 2:51 am -> 2026-08-06 @ 10:00 pm
Onset: 2026-08-06 @ 1:00 pm -> 2026-08-06 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Riverton WY on 2026-08-06 @ 2:51 am
Headline: Red Flag Warning issued August 6 at 1:51AM MDT until August 6 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...and Strong Gusty
Winds could cause erratic fire behavior.

* AFFECTED AREA:
In Central WY Fire Zones...280...283...289...300.
In North Central WY Fire Zone....281.

* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In North Central WY...Johnson.
In Southwest WY...Sweetwater.

* WIND: Northwest 10 to 20 mph with gusts up to 30 mph.

* HUMIDITY: As low as 6 percent.

* TEMPERATURES: Highs in the 90s.

Alert: Red Flag Warning
Area(s): East Wind River Mountains/South Shoshone NF
Effective: 2026-08-06 @ 2:51 am -> 2026-08-06 @ 10:00 pm
Onset: 2026-08-06 @ 1:00 pm -> 2026-08-06 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Riverton WY on 2026-08-06 @ 2:51 am
Headline: Red Flag Warning issued August 6 at 1:51AM MDT until August 6 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...and Strong Gusty
Winds could cause erratic fire behavior.

* AFFECTED AREA:
In Central WY...Fire Weather Zone 288.

* COUNTIES AFFECTED:
In Central WY...Fremont.
In West Central WY...Sublette.

* WIND: West 15 to 25 mph with gusts up to 35 mph.

* HUMIDITY: As low as 8 percent.

* TEMPERATURES: Highs around 80.