Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Air Quality Alert |
| Area(s): | Beaverhead, MT; Deer Lodge, MT; Flathead, MT; Granite, MT; Lake, MT; Lincoln, MT; Madison, MT; Mineral, MT; Missoula, MT; Ravalli, MT; Sanders, MT; Silver Bow, MT |
| Effective: | 2026-08-06 @ 8:15 am -> 2026-08-07 @ 10:00 am |
| Onset: | 2026-08-06 @ 8:15 am |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Great Falls MT on 2026-08-06 @ 8:34 am |
| Headline: | Air Quality Alert issued August 6 at 7:15AM MDT by NWS Great Falls MT |
| Description: |
AQAMT The Montana Department of Environmental Quality has issued an air quality alert for Beaverhead, Deer Lodge, Flathead, Granite, Lake, Lincoln, Madison, Mineral, Ravalli, Sanders, Silver Bow, and Missoula counties in effect until 9AM on 08/07/2026 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 7AM on 08/06/2026, particulate levels in Frenchtown, Hamilton and Libby are Unhealthy for Sensitive Groups. As of 7AM on 08/06/2026, particulate levels in Billings, Butte, Columbia Falls, Cut Bank, Dillon, Great Falls, Helena, Lewistown, Missoula, 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: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-08-06 @ 4:35 am -> 2026-08-06 @ 8:00 pm |
| Onset: | 2026-08-06 @ 10:00 am -> 2026-08-06 @ 8:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-06 @ 4:35 am |
| Headline: | Lake Wind Advisory issued August 6 at 3:35AM MDT until August 6 at 7:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Northwest winds 15 to 25 mph with gusts up to 35 mph expected. * WHERE...Fort Peck Lake. * WHEN...From 9 AM this morning to 7 PM MDT this evening. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. * ADDITIONAL DETAILS...Waves up to 4 feet are expected on Fort Peck Lake today. |
| Alert: | Red Flag Warning |
| Area(s): | Custer County; Sioux Ranger District Custer National Forest |
| Effective: | 2026-08-06 @ 1:50 am -> 2026-08-06 @ 9:00 pm |
| Onset: | 2026-08-06 @ 12:00 pm -> 2026-08-06 @ 9:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Billings MT on 2026-08-06 @ 1:50 am |
| Headline: | Red Flag Warning issued August 6 at 12:50AM MDT until August 6 at 8:00PM MDT by NWS Billings MT |
| Description: |
* IMPACTS: Low humidities, hot temperatures, gusty winds, and a wind shift with a cold front will create erratic fire behavior. * AFFECTED AREA: In Southeast MT Fire Zone...132. In Southeast MT and Northwest SD Fire Zone...133. * COUNTIES AFFECTED: In Northwest SD...Harding. In Southeast MT...Carter...Custer...Fallon. * COLD FRONT: A cold front will move through Thursday afternoon and evening shifting winds out of the northwest and increasing wind speeds. * WIND: West 10 to 20 mph with gusts up to 30 mph. * HUMIDITY: As low as 10 percent. * TEMPERATURES: Up to 95 degrees. |
| Alert: | Red Flag Warning |
| Area(s): | Dawson/McCone/Prairie/Richland/Wibaux Counties; The Lower Missouri River Breaks including the Charles M Russell National Wildlife Refuge; Southern Petroleum and Southern Garfield Counties |
| Effective: | 2026-08-05 @ 5:17 pm -> 2026-08-06 @ 8:00 pm |
| Onset: | 2026-08-06 @ 12:00 pm -> 2026-08-06 @ 8:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-05 @ 5:17 pm |
| Headline: | Red Flag Warning issued August 5 at 4:17PM MDT until August 6 at 7:00PM MDT by NWS Glasgow MT |
| Description: |
* WIND...Northwest at 15 to 25 mph with gusts to 35 mph. * HUMIDITY...As low as 12 percent. * THUNDERSTORMS...None * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. |