Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Extreme Heat Warning
Area(s): Central and Southeast Phillips; Central and Southern Valley; Daniels; Sheridan; Western Roosevelt; Petroleum; Garfield; McCone; Richland; Dawson; Prairie; Wibaux; Northern Phillips; Southwest Phillips; Northern Valley; Eastern Roosevelt
Effective: 2026-07-26 @ 10:51 pm -> 2026-07-27 @ 12:00 am
Onset: 2026-07-26 @ 10:51 pm -> 2026-07-26 @ 11:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-26 @ 10:51 pm
Headline: Extreme Heat Warning issued July 26 at 9:51PM MDT until July 26 at 10:00PM MDT by NWS Glasgow MT
Description: The threat has ended.

Alert: Extreme Heat Warning
Area(s): Custer; Fallon; Carter
Effective: 2026-07-26 @ 9:34 pm -> 2026-07-27 @ 9:45 pm
Onset: 2026-07-26 @ 9:34 pm -> 2026-07-28 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-26 @ 9:34 pm
Headline: Extreme Heat Warning issued July 26 at 8:34PM MDT until July 28 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Dangerously hot conditions with temperatures up to 102
degrees.

* WHERE...Carter, Custer, and Fallon.

* WHEN...Until midnight MDT Monday Night.

* 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): Treasure; Northern Rosebud; Powder River; Southern Rosebud
Effective: 2026-07-26 @ 9:34 pm -> 2026-07-27 @ 9:45 pm
Onset: 2026-07-26 @ 9:34 pm -> 2026-07-28 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-26 @ 9:34 pm
Headline: Heat Advisory issued July 26 at 8:34PM 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 Monday Night.

* 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: Heat Advisory
Area(s): Bighorn Canyon
Effective: 2026-07-26 @ 9:34 pm -> 2026-07-27 @ 9:45 pm
Onset: 2026-07-26 @ 9:34 pm -> 2026-07-28 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-26 @ 9:34 pm
Headline: Heat Advisory issued July 26 at 8:34PM MDT until July 28 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Temperatures up to 98 degrees.

* WHERE...Bighorn Canyon.

* WHEN...Until midnight MDT Monday Night.

* 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: 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