Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Air Quality Alert |
| Area(s): | Beaverhead, MT; Deer Lodge, MT; Flathead, MT; Gallatin, MT; Granite, MT; Jefferson, MT; Lake, MT; Lewis and Clark, MT; Lincoln, MT; Madison, MT; Mineral, MT; Missoula, MT; Park, MT; Powell, MT; Ravalli, MT; Sanders, MT; Silver Bow, MT |
| Effective: | 2026-08-11 @ 9:15 am -> 2026-08-12 @ 10:00 am |
| Onset: | 2026-08-11 @ 9:15 am |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Great Falls MT on 2026-08-11 @ 9:16 am |
| Headline: | Air Quality Alert issued August 11 at 8:15AM MDT by NWS Great Falls MT |
| Description: |
AQAMT The Montana Department of Environmental Quality has issued an air quality alert for Beaverhead, Deer Lodge, Gallatin, Granite, Madison, Park, Flathead, Jefferson, Lake, Lewis and Clark, Lincoln, Mineral, Missoula, Powell, Ravalli, and Silver Bow counties in effect until 9AM on 08/12/2026 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 08/11/2026, particulate levels in Missoula are Unhealthy. As of 8AM on 08/11/2026, particulate levels in Dillon, Frenchtown, Great Falls and Hamilton are Unhealthy for Sensitive Groups. As of 8AM on 08/11/2026, particulate levels in Billings, Butte, Choteau, Columbia Falls, Cut Bank, Helena, Lewistown, Libby, Malta, Thompson Falls and West Yellowstone 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): | Broadwater, MT; Sweet Grass, MT; Yellowstone, MT |
| Effective: | 2026-08-11 @ 9:15 am -> 2026-08-12 @ 10:00 am |
| Onset: | 2026-08-11 @ 9:15 am |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Great Falls MT on 2026-08-11 @ 9:16 am |
| Headline: | Air Quality Alert issued August 11 at 8:15AM MDT by NWS Great Falls MT |
| Description: |
AQAMT The Air Quality Alert for Broadwater, Sweet Grass and Yellowstone Counties has been cancelled. For more information visit the Montana Department of Environmental Quality at www.todaysair.mt.gov |
| Alert: | Red Flag Warning |
| Area(s): | Deerlodge/Western Beaverhead National Forest; Eastern Beaverhead National Forest |
| Effective: | 2026-08-10 @ 7:45 pm -> 2026-08-11 @ 3:45 am |
| Onset: | 2026-08-11 @ 1:00 pm -> 2026-08-11 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-08-10 @ 7:45 pm |
| Headline: | Red Flag Warning issued August 10 at 6:45PM MDT until August 11 at 9:00PM MDT by NWS Missoula MT |
| Description: |
...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT TUESDAY DUE TO WIND AND LOW RELATIVE HUMIDITY FOR DEERLODGE/WEST BEAVERHEAD AND EAST BEAVERHEAD... The National Weather Service in Missoula MT has issued a Red Flag Warning. * AFFECTED AREA...Fire Weather Zones 110 and 111. * TIMING...From noon to 9 PM MDT Tuesday. * WINDS...West winds 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...Relative Humidity between 12 to 25 percent. * IMPACTS...Any fires that develop will spread rapidly. Outdoor burning is not recommended. |