Cheyenne, Wyoming
Regional Weather Alerts
| Alert: | Flood Watch |
| Area(s): | Musselshell; Treasure; Northern Rosebud; Custer; Fallon; Northern Stillwater; Powder River; Carter; 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: | 2026-09-19 @ 11:40 pm -> 2026-09-20 @ 7:00 pm |
| Onset: | 2026-09-19 @ 11:40 pm -> 2026-09-20 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Billings MT on 2026-09-19 @ 11:40 pm |
| Headline: | Flood Watch issued September 19 at 10:40PM MDT until September 20 at 6:00PM MDT by NWS Billings MT |
| Description: |
A slow moving weather system will continue to impact the region through Sunday. The risk of flooding continues, especially over Southeast Montana and Northeast Wyoming. * WHAT...Flooding caused by excessive rainfall is possible, along with flash flooding over recent burn scars. * WHERE...All of South Central and Southeast Montana, and Sheridan County Wyoming. * WHEN...Through Sunday afternoon. * IMPACTS...Excessive runoff may result in flooding of creeks and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - The heaviest rainfall is slowly shifting over Southeastern Montana and Northeast Wyoming. The risk of flooding over south-centeral Montana is decreasing. - The Robertson Draw, East Side, Elk, and McGhee-Remington burn scars are particularly vulnerable to Flash Flooding and debris flows. Any other burn scars from this summer will have elevated Flash Flood potential as well. - http://www.weather.gov/safety/flood |
| Alert: | Flood Advisory |
| Area(s): | Niobrara, WY |
| Effective: | 2026-09-19 @ 10:36 pm -> 2026-09-20 @ 1:30 am |
| Onset: | 2026-09-19 @ 10:36 pm -> 2026-09-20 @ 1:30 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-09-19 @ 10:36 pm |
| Headline: | Flood Advisory issued September 19 at 9:36PM MDT until September 20 at 12:30AM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...West Central Niobrara County in east central Wyoming... * WHEN...Until 1230 AM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 936 PM MDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1.5 and 2 inches of rain have fallen. - Some locations that will experience flooding include... Mainly rural areas of West Central Niobrara County. - http://www.weather.gov/safety/flood |
| Alert: | Hydrologic Outlook |
| Area(s): | Big Horn, WY; Fremont, WY; Hot Springs, WY; Johnson, WY; Natrona, WY; Park, WY; Sweetwater, WY; Teton, WY; Washakie, WY |
| Effective: | 2026-09-19 @ 12:59 pm -> 2026-09-20 @ 10:00 am |
| Onset: | 2026-09-19 @ 12:59 pm |
| Severity: | Unknown |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Riverton WY on 2026-09-19 @ 12:59 pm |
| Headline: | Hydrologic Outlook issued September 19 at 11:59AM MDT by NWS Riverton WY |
| Description: |
ESFRIW Periods of showers and thunderstorms are expected across the northern half of Wyoming Saturday and Sunday as a wet weather system shifts east across the state. This weather system is funneling abundant tropical moisture into northern and eastern portions of the state with it's eastward progression. Given the high moisture content, many thunderstorms could feature heavy rainfall and possibly lead to localized flooding. Poor drainage areas, urban areas, and steep terrain will be the most susceptible locations for this isolated flooding. Many locations could see an additional 0.5" to 1.25" of rain through Sunday afternoon, with a majority of this rain falling quickly in thunderstorms. Remember, if you encounter a flooded roadway, turn around don't down! |
| Alert: | Flood Watch |
| Area(s): | Yellowstone National Park; Absaroka Mountains; Cody Foothills; Owl Creek and Bridger Mountains; Bighorn Mountains West; Bighorn Mountains Southeast; Northeast Johnson County; Southeast Johnson County |
| Effective: | 2026-09-19 @ 12:54 pm -> 2026-09-20 @ 8:00 am |
| Onset: | 2026-09-19 @ 12:54 pm -> 2026-09-20 @ 7:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Riverton WY on 2026-09-19 @ 12:54 pm |
| Headline: | Flood Watch issued September 19 at 11:54AM 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, Cody Foothills and Yellowstone National Park. * WHEN...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 and around steep terrain. * ADDITIONAL DETAILS... - A slow moving weather system will move across Wyoming today and Sunday and bring rounds of showers and thunderstorms to the region, especially northern Wyoming. Any shower or thunderstorm could produce moderate to heavy rainfall across the Watch Area. - http://www.weather.gov/safety/flood |
