Cheyenne, Wyoming

Regional Weather Alerts


     

Alert: Red Flag Warning
Area(s): North Laramie Range and Adjacent High Plains; North Laramie Valley/Shirley Basin; Ferris/Seminoe/Shirley Mountains; Central and West Carbon; Upper North Platte River Basin; North Snowy Range Foothills
Effective: 2026-09-08 @ 9:06 pm -> 2026-09-09 @ 5:15 am
Onset: 2026-09-09 @ 12:00 pm -> 2026-09-10 @ 9:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Cheyenne WY on 2026-09-08 @ 9:06 pm
Headline: Red Flag Warning issued September 8 at 8:06PM MDT until September 10 at 8:00PM MDT by NWS Cheyenne WY
Description: The National Weather Service in Cheyenne has issued a Red Flag
Warning, which is in effect from 11 AM Wednesday to 8 PM MDT
Thursday.

* AFFECTED AREA...Fire weather zone 419, 410, 421, 422, 455, and
427.

* WIND...Westerly 15 to 30 MPH with occasional gusts up to 40 MPH.
The strongest winds will occur Thursday afternoon.

* HUMIDITY...10% to 15% Wednesday afternoon and as low as 5%
Thursday afternoon. Poor humidity recoveries Wednesday night
with recoveries as low as 20% over Albany and Carbon Counties.

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

Alert: Fire Weather Watch
Area(s): Lincoln and Uinta Counties/Lower Elevations; Upper Green River Basin/Rock Springs BLM; Sweetwater County/Rock Springs BLM/Flaming Gorge NRA
Effective: 2026-09-08 @ 7:59 pm -> 2026-09-09 @ 2:00 pm
Onset: 2026-09-09 @ 1:00 pm -> 2026-09-09 @ 8:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Riverton WY on 2026-09-08 @ 7:59 pm
Headline: Fire Weather Watch issued September 8 at 6:59PM MDT until September 9 at 7:00PM MDT by NWS Riverton WY
Description: * IMPACTS: Low Humidity and Gusty Westerly Wind 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 15 mph with gusts up to 30 mph.

* HUMIDITY: 10 to 13 percent.

Alert: Red Flag Warning
Area(s): Natrona County/Casper BLM; Granite/Green/Ferris/Rattlesnake Mountains; Casper Mountain
Effective: 2026-09-08 @ 7:59 pm -> 2026-09-09 @ 2:00 pm
Onset: 2026-09-08 @ 7:59 pm -> 2026-09-10 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Riverton WY on 2026-09-08 @ 7:59 pm
Headline: Red Flag Warning issued September 8 at 6:59PM MDT until September 10 at 9:00PM MDT by NWS Riverton WY
Description: * IMPACTS: Low Humidity...Gusty Wind...and a Wind Shift in
association with a Cold Front could cause erratic fire behavior.

* AFFECTED AREA:
In Central WY...Fire Weather Zones 280...289 and 300.

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

* COLD FRONT: Winds turn northerly after sunset Tuesday, as a dry
cold front moves south across the region.

* WIND: Wednesday, west to southwest 10 to 20 mph with gusts to
around 25 mph. Thursday, west to southwest 15 to 25 mph with
gusts up to 45 mph.

* HUMIDITY: 6 to 10 percent.

Alert: Freeze Warning
Area(s): Jackson Hole; Star Valley; Upper Green River Basin Foothills; Upper Green River Basin; South Lincoln County
Effective: 2026-09-08 @ 12:34 pm -> 2026-09-09 @ 10:00 am
Onset: 2026-09-09 @ 3:00 am -> 2026-09-09 @ 10:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Riverton WY on 2026-09-08 @ 12:34 pm
Headline: Freeze Warning issued September 8 at 11:34AM MDT until September 9 at 9:00AM MDT by NWS Riverton WY
Description: * WHAT...Sub-freezing temperatures 26 to 32 degrees expected.
Isolated cold prone areas 22 to 25 degrees.

* WHERE...Jackson Hole, South Lincoln, Star Valley, Upper Green River
Basin, and Upper Green River Basin Foothills Counties.

* WHEN...From 2 AM to 9 AM MDT Wednesday.

* IMPACTS...Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.

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