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Casper Warnings, Watches and Advisories

SAFETY and DATA MESSAGE

When a severe thunderstorm warning is issued, the storm may produce damaging winds, large hail, dangerous lightning, and heavy rain. In some cases, heavy rainfall produced by a severe storm can also lead to flash flooding. Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Casper.

Use the Radar Maps link provided to understand the trajectory of a storm.

Radar Maps

NWS Active Alerts for WY - Map View

State: WY Total alerts: 1 Updated: Sep 2, 2026 10:24am MDT

Red Flag Warning

Area
North Bighorn Basin/Worland BLM; Cody Foothills; Lincoln and Uinta Counties/Lower Elevations; Upper Green River Basin/Rock Springs BLM; Sweetwater County/Rock Springs BLM/Flaming Gorge NRA; Natrona County/Casper BLM; Johnson County/Casper BLM; South Bighorn Basin/Worland BLM; Upper Wind River Basin/Wind River Basin; South Bighorn Mountains; Absaroka Mountains/North Shoshone NF; Owl Creek Mountains; East Wind River Mountains/South Shoshone NF; Granite/Green/Ferris/Rattlesnake Mountains; Casper Mountain

Red Flag Warning issued September 2 at 9:22AM MDT until September 3 at 9:00PM MDT by NWS Riverton WY

The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from noon to 9 PM MDT Thursday. * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds could cause erratic fire behavior. * AFFECTED AREA: In Central WY Fire Zones...280...283...285...288...289...300. In North Central WY Fire Zones...275...276...281...282...287. In Northwest WY Fire Zone....286. In Southwest WY Fire Zones...277...279. In West Central WY Fire Zone....278. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Big Horn...Hot Springs...Johnson...Park Washakie. In Southwest WY...Sweetwater...Uinta. In West Central WY...Lincoln...Sublette. * WIND: Southwest 20 to 30 mph with gusts up to 35 to 45 mph. * HUMIDITY: As low as 10 to 15 percent. * TEMPERATURES: Highs in the 70s west of the Divide and the mountains, in the 80s to near 90 in the lower basins east of the Divide.

Severity
Severe

Certainty
Likely

Urgency
Expected

Published
September 2nd, 2026 09:22:00 am MDT

Effective
September 2nd, 2026 09:22:00 am MDT

Expires
September 3rd, 2026 07:00:00 am MDT

For more official information about severe storms and how to stay safe, visit the National Weather Service's Severe Thunderstorm Safety page. We encourage you to also monitor Excessive Rainfall Forecasts on their Weather Prediction Center website.

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