Severe · Red Flag WarningActive alert

Red Flag Warning issued September 8 at 12:58AM MDT until September 10

Affecting Natrona County/Casper BLM; Granite/Green/Ferris/Rattlesnake Mountains; Casper Mountain

In effect until: Sep 9, 2026, 1:00 AM

Natrona County/Casper BLM; Granite/Green/Ferris/Rattlesnake Mountains; Casper Mountain

Likely impact; effects through 1:00 AM.

A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior.

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Read the original bulletin (official text)

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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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™

Red Flag Warning issued September 8 at 12:58AM MDT until September 10

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