Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Heat Advisory |
| Area(s): | Treasure; Northern Rosebud; Powder River; Southern Rosebud |
| Effective: | 2026-07-27 @ 2:24 am -> 2026-07-28 @ 1:00 am |
| Onset: | 2026-07-27 @ 2:24 am -> 2026-07-28 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-27 @ 2:24 am |
| Headline: | Heat Advisory issued July 27 at 1:24AM MDT until July 28 at 12:00AM MDT by NWS Billings MT |
| Description: |
* WHAT...Temperatures up to 100 degrees. * WHERE...Treasure, Northern Rosebud, Powder River, and Southern Rosebud. * WHEN...Until midnight MDT tonight. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Hot daytime temperatures combined with warm overnight low temperatures will produce cumulative heat stress. This heat stress will quickly become dangerous to anyone without adequate cooling and hydration. |
| Alert: | Extreme Heat Warning |
| Area(s): | Custer; Fallon; Carter |
| Effective: | 2026-07-27 @ 2:24 am -> 2026-07-28 @ 1:00 am |
| Onset: | 2026-07-27 @ 2:24 am -> 2026-07-28 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-27 @ 2:24 am |
| Headline: | Extreme Heat Warning issued July 27 at 1:24AM MDT until July 28 at 12:00AM MDT by NWS Billings MT |
| Description: |
* WHAT...Dangerously hot conditions with temperatures up to 103 degrees. * WHERE...Carter, Custer, and Fallon. * WHEN...Until midnight MDT tonight. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Dangerously hot daytime temperatures combined with warm overnight low temperatures will produce cumulative heat stress. This heat stress will quickly become dangerous to anyone without adequate cooling and hydration. |
| Alert: | Heat Advisory |
| Area(s): | Bighorn Canyon |
| Effective: | 2026-07-27 @ 2:24 am -> 2026-07-28 @ 1:00 am |
| Onset: | 2026-07-27 @ 2:24 am -> 2026-07-28 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-27 @ 2:24 am |
| Headline: | Heat Advisory issued July 27 at 1:24AM MDT until July 28 at 12:00AM MDT by NWS Billings MT |
| Description: |
* WHAT...Temperatures up to 96 degrees. * WHERE...Bighorn Canyon. * WHEN...Until midnight MDT tonight. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Hot daytime temperatures combined with warm overnight low temperatures will produce cumulative heat stress. This heat stress will become dangerous to anyone without adequate cooling and hydration. |
| Alert: | Extreme Heat Warning |
| Area(s): | Dawson; Prairie; Wibaux |
| Effective: | 2026-07-27 @ 1:07 am -> 2026-07-27 @ 5:00 pm |
| Onset: | 2026-07-27 @ 11:00 am -> 2026-07-27 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-27 @ 1:07 am |
| Headline: | Extreme Heat Warning issued July 27 at 12:07AM MDT until July 27 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Dangerously hot conditions with high near 100 expected. * WHERE...Dawson, Prairie, and Wibaux Counties. * WHEN...From 10 AM this morning to 10 PM MDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. |
| Alert: | Air Quality Alert |
| Area(s): | Chouteau, MT; Granite, MT; Hill, MT; Lewis and Clark, MT; Liberty, MT; Missoula, MT; Pondera, MT; Powell, MT; Ravalli, MT; Teton, MT; Toole, MT |
| Effective: | 2026-07-26 @ 9:55 am -> 2026-07-27 @ 9:55 am |
| Onset: | 2026-07-26 @ 9:55 am |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Great Falls MT on 2026-07-26 @ 9:56 am |
| Headline: | Air Quality Alert issued July 26 at 8:55AM MDT by NWS Great Falls MT |
| Description: |
AQAMT The Montana Department of Environmental Quality has issued an air quality alert for Chouteau, Granite, Hill, Lewis and Clark, Liberty, Missoula, Pondera, Powell, Ravalli, Teton, Toole counties in effect until 9:00 AM on 07/27/2026 An Air Quality Alert means that particulates have been trending upwards and that an exceedance of the 24 hour National Ambient Air Quality Standard (NAAQS) has occurred or may occur in the near future. Elevated particulate levels from wildfire smoke As of 8AM on 07/26/2026, particulate levels in Cut Bank, Hamilton and Missoula are Unhealthy for Sensitive Groups. As of 8AM on 07/26/2026, particulate levels in Butte, Columbia Falls, Dillon, Frenchtown, Great Falls, Havre, Helena, Libby, Malta, Sleeping Giant and Thompson Falls are Moderate. When air quality is Unhealthy for Sensitive Groups... State and local health officials recommend that people with respiratory or heart disease, the elderly and children should limit prolonged exertion. When air quality is Moderate... State and local health officials recommend that unusually sensitive people should consider reducing prolonged or heavy exertion. For more information visit the Montana Department of Environmental Quality at http://todaysair.mtdeq.us |