Cheyenne, Wyoming
Regional Weather Alerts
| Alert: | Heat Advisory |
| Area(s): | Box Butte; Scotts Bluff; Banner; Morrill; South Sioux; Converse County Lower Elevations; Niobrara County; Goshen County |
| Effective: | 2026-07-17 @ 1:12 pm -> 2026-07-18 @ 7:00 am |
| Onset: | 2026-07-19 @ 1:00 pm -> 2026-07-20 @ 7:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Cheyenne WY on 2026-07-17 @ 1:12 pm |
| Headline: | Heat Advisory issued July 17 at 12:12PM MDT until July 20 at 6:00PM MDT by NWS Cheyenne WY |
| Description: |
* WHAT...Afternoon temperatures between the upper 90's to low 100's with overnight lows in the mid 60's to low 70's. * WHERE...In Nebraska, Banner County, Box Butte County, Morrill County, Scotts Bluff County, and Southern Sioux County. In Wyoming, Converse County Lower Elevations, Niobrara County, and Goshen County. * WHEN...From noon Sunday to 6 PM MDT Monday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. |
| Alert: | Flood Watch |
| Area(s): | Yellowstone National Park |
| Effective: | 2026-07-17 @ 11:33 am -> 2026-07-17 @ 11:00 pm |
| Onset: | 2026-07-17 @ 1:00 pm -> 2026-07-17 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Riverton WY on 2026-07-17 @ 11:33 am |
| Headline: | Flood Watch issued July 17 at 10:33AM MDT until July 17 at 10:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northwest Wyoming, including the following area, Yellowstone National Park. * WHEN...Until 10 PM MDT this evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Heavy rainfall from slow moving showers and thunderstorms may bring local flooding. - http://www.weather.gov/safety/flood |
| Alert: | Flood Watch |
| Area(s): | Absaroka Mountains; Cody Foothills; North Bighorn Basin; Southwest Bighorn Basin; Owl Creek and Bridger Mountains |
| Effective: | 2026-07-17 @ 11:33 am -> 2026-07-17 @ 11:00 pm |
| Onset: | 2026-07-17 @ 1:00 pm -> 2026-07-17 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Riverton WY on 2026-07-17 @ 11:33 am |
| Headline: | Flood Watch issued July 17 at 10:33AM MDT until July 17 at 10:00PM MDT by NWS Riverton WY |
| Description: |
* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of central and northwest Wyoming, including the following areas, in central Wyoming, Owl Creek and Bridger Mountains and Southwest Bighorn Basin. In northwest Wyoming, Absaroka Mountains, Cody Foothills and North Bighorn Basin. * WHEN...Until 10 PM MDT this evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Heavy rainfall from slow moving showers and thunderstorms may bring local flooding. - http://www.weather.gov/safety/flood |
| Alert: | Heat Advisory |
| Area(s): | Harding; Northern Perkins; Butte; Northern Meade Co Plains; Ziebach; Northern Foothills; Rapid City; Southern Foothills; Custer Co Plains; Pennington Co Plains; Haakon; Western Fall River; Northern Oglala Lakota; Northern Jackson; Bennett; Mellette; Todd; Tripp; Sturgis/Piedmont Foothills; Southern Meade Co Plains; Hermosa Foothills; Eastern Fall River; Southern Oglala Lakota; Southern Jackson; Southern Perkins; Northern Campbell; Southern Campbell; Western Crook; Weston County Plains; Newcastle; Northeastern Crook |
| Effective: | 2026-07-17 @ 2:49 am -> 2026-07-17 @ 6:00 pm |
| Onset: | 2026-07-17 @ 2:49 am -> 2026-07-19 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Rapid City SD on 2026-07-17 @ 2:49 am |
| Headline: | Heat Advisory issued July 17 at 1:49AM MDT until July 19 at 9:00PM MDT by NWS Rapid City SD |
| Description: |
* WHAT...Peak afternoon heat index values of 95 to 105. * WHERE...Portions of northwestern, south central, and southwestern South Dakota and northeast Wyoming. * WHEN...Until 9 PM MDT /10 PM CDT/ Sunday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. |