Yellowstone National Park, Wyoming
Regional Weather Alerts
| 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 |
| Alert: | Extreme Heat Warning |
| Area(s): | Daniels; Sheridan |
| Effective: | 2026-07-26 @ 1:38 am -> 2026-07-26 @ 4:00 pm |
| Onset: | 2026-07-26 @ 1:38 am -> 2026-07-26 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-26 @ 1:38 am |
| Headline: | Extreme Heat Warning issued July 26 at 12:38AM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Dangerously hot conditions with heat index values near 100 with little to no overnight recovery. * WHERE...Daniels and Sheridan Counties. * WHEN...Until 10 PM MDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. |
| Alert: | Extreme Heat Warning |
| Area(s): | Northern Phillips; Northern Valley |
| Effective: | 2026-07-26 @ 1:38 am -> 2026-07-26 @ 4:00 pm |
| Onset: | 2026-07-26 @ 1:38 am -> 2026-07-26 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-26 @ 1:38 am |
| Headline: | Extreme Heat Warning issued July 26 at 12:38AM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Dangerously hot conditions with temperatures near 100 with little to no overnight recovery * WHERE...Northern Phillips and Northern Valley Counties. * WHEN...Until 10 PM MDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. |
| Alert: | Extreme Heat Warning |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Western Roosevelt; Petroleum; Garfield; McCone; Richland; Dawson; Prairie; Wibaux; Southwest Phillips; Eastern Roosevelt |
| Effective: | 2026-07-26 @ 1:38 am -> 2026-07-26 @ 4:00 pm |
| Onset: | 2026-07-26 @ 1:38 am -> 2026-07-26 @ 11:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-07-26 @ 1:38 am |
| Headline: | Extreme Heat Warning issued July 26 at 12:38AM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Dangerously hot conditions with temperatures up to near 100 degrees with little to no overnight recovery. * WHERE...A portion of northeast Montana. * WHEN...Until 10 PM MDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. |
| Alert: | Heat Advisory |
| Area(s): | Judith Gap; Northern Sweet Grass; Melville Foothills; Southern Wheatland |
| Effective: | 2026-07-25 @ 11:45 pm -> 2026-07-26 @ 10:00 pm |
| Onset: | 2026-07-25 @ 11:45 pm -> 2026-07-26 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-25 @ 11:45 pm |
| Headline: | Heat Advisory issued July 25 at 10:45PM MDT until July 26 at 9:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Hot conditions with high temperatures of 90 to 100 degrees expected. * WHERE...Judith Gap, Southern Wheatland, Melville Foothills, and Northern Sweet Grass. * WHEN...Until 9 PM MDT Sunday. * 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): | Northern Rosebud; Custer; Fallon; Powder River; Carter; Southern Rosebud |
| Effective: | 2026-07-25 @ 11:45 pm -> 2026-07-26 @ 11:45 pm |
| Onset: | 2026-07-25 @ 11:45 pm -> 2026-07-27 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-25 @ 11:45 pm |
| Headline: | Extreme Heat Warning issued July 25 at 10:45PM MDT until July 27 at 9:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Dangerously hot conditions with temperatures up to 102 degrees expected. * WHERE...A portion of southeast Montana. * WHEN...Until 9 PM MDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * 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): | Musselshell; Treasure; Northern Stillwater; Golden Valley; Red Lodge Foothills; Northern Big Horn; Beartooth Foothills; Southern Big Horn; Southeastern Carbon; Bighorn Canyon; Northern Carbon; Northeastern Yellowstone; Southwestern Yellowstone; Sheridan Foothills |
| Effective: | 2026-07-25 @ 11:45 pm -> 2026-07-26 @ 10:00 pm |
| Onset: | 2026-07-25 @ 11:45 pm -> 2026-07-26 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-07-25 @ 11:45 pm |
| Headline: | Heat Advisory issued July 25 at 10:45PM MDT until July 26 at 9:00PM MDT by NWS Billings MT |
| Description: |
* WHAT...Temperatures of 95 to 100 degrees expected. * WHERE...Portions of central and south central Montana and north central Wyoming. * WHEN...Until 9 PM MDT Sunday. * 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: | Heat Advisory |
| Area(s): | Hill County; Northern Blaine County; Western and Central Chouteau County; Cascade County below 5000ft; Judith Basin County and Judith Gap |
| Effective: | 2026-07-25 @ 11:40 pm -> 2026-07-26 @ 2:45 pm |
| Onset: | 2026-07-25 @ 11:40 pm -> 2026-07-26 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-25 @ 11:40 pm |
| Headline: | Heat Advisory issued July 25 at 10:40PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Hot Conditions. High temperatures of between 95 and 100 degrees. * WHERE...Cascade County below 5000ft, Hill County, Judith Basin County and Judith Gap, Northern Blaine County, and Western and Central Chouteau County. * WHEN...Until 9 PM MDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses. |
| Alert: | Extreme Heat Warning |
| Area(s): | Bears Paw Mountains and Southern Blaine; Fergus County below 4500ft |
| Effective: | 2026-07-25 @ 11:40 pm -> 2026-07-26 @ 2:45 pm |
| Onset: | 2026-07-25 @ 11:40 pm -> 2026-07-26 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-25 @ 11:40 pm |
| Headline: | Extreme Heat Warning issued July 25 at 10:40PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Dangerously hot conditions. High temperatures between 95 and 102 expected. * WHERE...Bears Paw Mountains and Southern Blaine and Fergus County below 4500ft. * WHEN...Until 9 PM MDT Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat. * ADDITIONAL DETAILS...The hottest temperatures will occur in the Missouri River Breaks. |
| Alert: | Heat Advisory |
| Area(s): | Eastern Glacier, Western Toole, and Central Pondera; Eastern Toole and Liberty; Eastern Pondera and Eastern Teton; Gates of the Mountains; Helena Valley; Meagher County Valleys; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley; Beaverhead and Western Madison below 6000ft |
| Effective: | 2026-07-25 @ 11:40 pm -> 2026-07-26 @ 2:45 pm |
| Onset: | 2026-07-25 @ 11:40 pm -> 2026-07-26 @ 10:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-07-25 @ 11:40 pm |
| Headline: | Heat Advisory issued July 25 at 10:40PM MDT until July 26 at 9:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Hot Conditions. High temperatures of between 90 and 95 degrees. * WHERE...Portions of central, north central, and southwest Montana. * WHEN...Until 9 PM MDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses. |