Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Extreme Heat Warning
Area(s): Dawson; Prairie; Wibaux
Effective: 2026-07-27 @ 2:05 pm -> 2026-07-27 @ 11:00 pm
Onset: 2026-07-27 @ 2:05 pm -> 2026-07-27 @ 11:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-07-27 @ 2:05 pm
Headline: Extreme Heat Warning issued July 27 at 1:05PM MDT until July 27 at 10:00PM MDT by NWS Glasgow MT
Description: * WHAT...Dangerously hot conditions with high temperatures near 100
expected.

* WHERE...Dawson, Prairie, and Wibaux Counties.

* 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): Powder River; Southern Rosebud
Effective: 2026-07-27 @ 12:46 pm -> 2026-07-28 @ 1:00 am
Onset: 2026-07-27 @ 12:46 pm -> 2026-07-28 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-27 @ 12:46 pm
Headline: Heat Advisory issued July 27 at 11:46AM MDT until July 28 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Temperatures up to 98 occurring.

* WHERE...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): Fallon; Carter
Effective: 2026-07-27 @ 12:46 pm -> 2026-07-28 @ 1:00 am
Onset: 2026-07-27 @ 12:46 pm -> 2026-07-28 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-27 @ 12:46 pm
Headline: Extreme Heat Warning issued July 27 at 11:46AM MDT until July 28 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Dangerously hot conditions with temperatures up to 102
occurring.

* WHERE...Carter and Fallon.

* 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
Effective: 2026-07-27 @ 12:46 pm -> 2026-07-28 @ 1:00 pm
Onset: 2026-07-27 @ 12:46 pm -> 2026-07-28 @ 1:00 am
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-27 @ 12:46 pm
Headline: Extreme Heat Warning issued July 27 at 11:46AM MDT until July 28 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...For the Extreme Heat Warning, dangerously hot conditions
with temperatures up to 102 occurring. For the Heat Advisory,
temperatures up to 97 expected.

* WHERE...Custer.

* WHEN...For the Extreme Heat Warning, until midnight MDT tonight.
For the Heat Advisory, from midnight tonight to midnight MDT
Tuesday 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): Treasure; Northern Rosebud; Bighorn Canyon
Effective: 2026-07-27 @ 12:46 pm -> 2026-07-28 @ 1:00 pm
Onset: 2026-07-27 @ 12:46 pm -> 2026-07-29 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-27 @ 12:46 pm
Headline: Heat Advisory issued July 27 at 11:46AM MDT until July 29 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Temperatures up to 95 expected.

* WHERE...Bighorn Canyon, Treasure, and Northern Rosebud.

* WHEN...Until midnight MDT Tuesday 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): Custer
Effective: 2026-07-27 @ 12:46 pm -> 2026-07-28 @ 1:00 pm
Onset: 2026-07-28 @ 1:00 am -> 2026-07-29 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-07-27 @ 12:46 pm
Headline: Heat Advisory issued July 27 at 11:46AM MDT until July 29 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...For the Extreme Heat Warning, dangerously hot conditions
with temperatures up to 102 occurring. For the Heat Advisory,
temperatures up to 97 expected.

* WHERE...Custer.

* WHEN...For the Extreme Heat Warning, until midnight MDT tonight.
For the Heat Advisory, from midnight tonight to midnight MDT
Tuesday 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: Air Quality Alert
Area(s): Blaine, MT; Cascade, MT; Chouteau, MT; Deer Lodge, MT; Fergus, MT; Glacier, MT; Granite, MT; Hill, MT; Judith Basin, MT; Lake, MT; Lewis and Clark, MT; Liberty, MT; Missoula, MT; Petroleum, MT; Phillips, MT; Pondera, MT; Powell, MT; Ravalli, MT; Silver Bow, MT; Teton, MT; Toole, MT
Effective: 2026-07-27 @ 9:43 am -> 2026-07-28 @ 10:00 am
Onset: 2026-07-27 @ 9:43 am
Severity: Unknown
Certainty: Unknown
Urgency: Unknown
Issued By: NWS Great Falls MT on 2026-07-27 @ 9:44 am
Headline: Air Quality Alert issued July 27 at 8:43AM MDT by NWS Great Falls MT
Description: AQAMT

The Montana Department of Environmental Quality has issued an air
quality alert for Blaine, Cascade, Chouteau, Deer Lodge, Fergus,
Glacier, Granite, Hill, Judith Basin, Lake, Lewis and Clark,
Liberty, Missoula, Petroleum, Pondera, Powell, Ravalli, Silver Bow,
Teton, Toole, Phillips counties in effect until 9AM on 07/28/2026 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 6AM on 07/27/2026, particulate levels in Havre and Malta are
Unhealthy.

As of 6AM on 07/27/2026, particulate levels in Butte, Great Falls,
Hamilton, Helena, Lewistown and Sleeping Giant are Unhealthy for
Sensitive Groups.

As of 6AM on 07/27/2026, particulate levels in Columbia Falls, Cut
Bank, Dillon, Frenchtown, Libby, Missoula and Thompson Falls are
Moderate.

When air quality is Unhealthy... State and local health officials
recommend that people with respiratory or heart disease, the elderly,
and children should avoid prolonged exertion; everyone else should
limit prolonged exertion.

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: Air Quality Alert
Area(s): Blaine, MT; Cascade, MT; Chouteau, MT; Deer Lodge, MT; Fergus, MT; Glacier, MT; Granite, MT; Hill, MT; Judith Basin, MT; Lake, MT; Lewis and Clark, MT; Liberty, MT; Missoula, MT; Petroleum, MT; Phillips, MT; Pondera, MT; Powell, MT; Ravalli, MT; Silver Bow, MT; Teton, MT; Toole, MT
Effective: 2026-07-27 @ 9:30 am -> 2026-07-28 @ 10:00 am
Onset: 2026-07-27 @ 9:30 am
Severity: Unknown
Certainty: Unknown
Urgency: Unknown
Issued By: NWS Great Falls MT on 2026-07-27 @ 9:31 am
Headline: Air Quality Alert issued July 27 at 8:30AM MDT by NWS Great Falls MT
Description: AQAMT

The Montana Department of Environmental Quality has issued an air
quality alert for Blaine, Cascade, Chouteau, Deer Lodge, Fergus,
Glacier, Granite, Hill, Judith Bsain, Lake, Lewis and Clark,
Liberty, Missoula, Petroleum, Pondera, Powell, Ravalli, Silver Bow,
Teton, Toole, Phillips counties in effect until 9AM on 07/28/2026 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 6AM on 07/27/2026, particulate levels in Havre and Malta are
Unhealthy.

As of 6AM on 07/27/2026, particulate levels in Butte, Great Falls,
Hamilton, Helena, Lewistown and Sleeping Giant are Unhealthy for
Sensitive Groups.

As of 6AM on 07/27/2026, particulate levels in Columbia Falls, Cut
Bank, Dillon, Frenchtown, Libby, Missoula and Thompson Falls are
Moderate.

When air quality is Unhealthy... State and local health officials
recommend that people with respiratory or heart disease, the elderly,
and children should avoid prolonged exertion; everyone else should
limit prolonged exertion.

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