Cheyenne, Wyoming
Regional Weather Alerts
| Alert: | Special Weather Statement |
| Area(s): | Salt River and Wyoming Ranges; South Lincoln County |
| Effective: | 2026-09-17 @ 8:42 pm -> 2026-09-17 @ 9:15 pm |
| Onset: | 2026-09-17 @ 8:42 pm |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Riverton WY on 2026-09-17 @ 8:42 pm |
| Headline: | Special Weather Statement issued September 17 at 7:42PM MDT by NWS Riverton WY |
| Description: |
At 741 PM MDT, Doppler radar was tracking a strong thunderstorm 9 miles northwest of Cokeville, moving north at 50 mph. HAZARD...Wind gusts up to 50 mph and nickel size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Salt River Pass. |
| Alert: | Flood Watch |
| Area(s): | Musselshell; Treasure; Northern Rosebud; Northern Stillwater; Powder River; Northern Park; Golden Valley; Red Lodge Foothills; Northern Big Horn; Southern Rosebud; Judith Gap; Paradise Valley; Livingston Area; Beartooth Foothills; Absaroka/Beartooth Mountains; Crazy Mountains; Southern Big Horn; Southeastern Carbon; Northern Sweet Grass; Bighorn Canyon; Northern Carbon; Pryor/Northern Bighorn Mountains; Melville Foothills; Northeastern Yellowstone; Southern Wheatland; Southwestern Yellowstone; Northeast Bighorn Mountains; Sheridan Foothills |
| Effective: | 2026-09-17 @ 8:33 pm -> 2026-09-18 @ 8:45 pm |
| Onset: | 2026-09-18 @ 7:00 pm -> 2026-09-20 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-09-17 @ 8:33 pm |
| Headline: | Flood Watch issued September 17 at 7:33PM MDT until September 20 at 6:00PM MDT by NWS Billings MT |
| Description: |
A strong and slow moving fall storm system will impact the region from Friday night through Sunday. Well above normal atmospheric moisture levels combined with the dynamics from this storm system will provide the potential for heavy rainfall during this period. Thunderstorms embedded in the more general rainfall will have the potential to produce flash flooding, particularly over recent burn scars. * WHAT...Flooding caused by excessive rainfall is possible, along with Flash Flooding of recent burn scars. * WHERE...All of South Central Montana, Portions of Southeast Montana, and Sheridan County Wyoming. * WHEN...From Friday evening through Sunday afternoon. * IMPACTS...Excessive runoff may result in flooding of creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - 1 to 2.5 inches of rainfall is forecast across the watch area Friday night through Sunday. Locally heavier accumulations up to 4 inches are possible where thunderstorm activity develops. - The Robertson Draw, East Side, Elk, and McGhee-Remington burn scars are particularly vulnerable to Flash Flooding and debris flows during the watch period. Any other burn scars from this summer will have elevated Flash Flood potential as well. - http://www.weather.gov/safety/flood |
| Alert: | Flood Watch |
| Area(s): | Absaroka Mountains; Cody Foothills; Owl Creek and Bridger Mountains; Bighorn Mountains West; Bighorn Mountains Southeast; Northeast Johnson County; Southeast Johnson County |
| Effective: | 2026-09-17 @ 11:33 am -> 2026-09-18 @ 7:00 am |
| Onset: | 2026-09-18 @ 1:00 pm -> 2026-09-20 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Riverton WY on 2026-09-17 @ 11:33 am |
| Headline: | Flood Watch issued September 17 at 10:33AM MDT until September 20 at 6:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Flash flooding caused by moderate to heavy rainfall is possible, especially in terrain and poor drainage areas. * WHERE...Portions of central, north central, and northwest Wyoming, including the following areas, in central Wyoming, Owl Creek and Bridger Mountains. In north central Wyoming, Bighorn Mountains Southeast, Bighorn Mountains West, Northeast Johnson County and Southeast Johnson County. In northwest Wyoming, Absaroka Mountains and Cody Foothills. * WHEN...From Friday afternoon through Sunday afternoon. * IMPACTS...Excessive rainfall may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - A slow moving weather system is forecast to trek across Wyoming Friday through Sunday and bring abundant moisture to the region, especially northern Wyoming, and thunderstorms. Multiple rounds of thunderstorms are expected and will be capable of producing moderate to heavy rainfall across the Watch Area. - http://www.weather.gov/safety/flood |
