Cheyenne, Wyoming

Regional Weather Alerts


     

Alert: Red Flag Warning
Area(s): Cody Foothills; Upper Wind River Basin/Wind River Basin; South Bighorn Mountains; Owl Creek Mountains
Effective: 2026-09-08 @ 1:58 am -> 2026-09-08 @ 8:00 pm
Onset: 2026-09-08 @ 1:00 pm -> 2026-09-08 @ 8:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Riverton WY on 2026-09-08 @ 1:58 am
Headline: Red Flag Warning issued September 8 at 12:58AM MDT until September 8 at 7:00PM 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 7 PM MDT this
evening.

* IMPACTS: Low Humidities...Strong Gusty Winds...and Wind Shift
with a Cold Front could cause erratic fire behavior.

* AFFECTED AREA:
In Central WY Fire Zones...283...285.
In North Central WY Fire Zones...276...287.

* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In North Central WY...Hot Springs...Johnson...Park...Washakie.

* COLD FRONT: A cold front will reach northern portions of the
Bighorn Basin around 1800. Winds will turn more northerly as the
front progresses southward through the evening.

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

* HUMIDITY: Ranging between 12 and 19 percent.

Alert: Red Flag Warning
Area(s): Natrona County/Casper BLM; Granite/Green/Ferris/Rattlesnake Mountains; Casper Mountain
Effective: 2026-09-08 @ 1:58 am -> 2026-09-08 @ 8:00 pm
Onset: 2026-09-08 @ 1:00 pm -> 2026-09-10 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Riverton WY on 2026-09-08 @ 1:58 am
Headline: Red Flag Warning issued September 8 at 12:58AM MDT until September 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 Thursday.

* IMPACTS: Low Humidities...Strong Gusty Winds...and Wind Shift
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 will turn more northerly after sunset tonight,
as a cold front comes down from the north.

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

Wednesday - West to southwest 10 to 15 mph with gusts up to 25
mph.

Thursday West to southwest 15 to 25 mph with gusts up to 45 mph.

* HUMIDITY: Tuesday - Ranging between 11 to 18 percent.

Wednesday - As low as 8 percent.

Thursday - As low as 7 percent.

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