Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Flash Flood Watch |
| Area(s): | Big Belt, Bridger and Castle Mountains |
| Effective: | 2026-08-13 @ 4:42 am -> 2026-08-13 @ 6:00 pm |
| Onset: | 2026-08-13 @ 7:00 pm -> 2026-08-14 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-08-13 @ 4:42 am |
| Headline: | Flash Flood Watch issued August 13 at 3:42AM MDT until August 14 at 12:00AM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Flash flooding and debris flows caused by excessive rainfall continue to be possible over the Horse Gulch burn scar and the Riverside Campground. * WHERE...A portion of central Montana, including the following areas, Horse Gulch burn scar, including Riverside Campground. * WHEN...This evening. * IMPACTS...Heavy rainfall over the Horse Gulch burn scar is expected up to and during the period of the watch. Residents near the Horse Gulch burn scar and Riverside Campground should prepare for potential debris flow. Be sure to stay up to date with information from local authorities. Heavy rainfall could trigger flash flooding of low-lying areas and debris flows in and near recent wildfire burn scars. * ADDITIONAL DETAILS... - National Weather Service Meteorologists are forecasting heavy rainfall over the Horse Gulch burn scar, which may lead to flash flooding and debris flows. - For flood safety, go to this web page. http://www.weather.gov/safety/flood |
| Alert: | Flash Flood Watch |
| Area(s): | Northwest Beaverhead County |
| Effective: | 2026-08-13 @ 4:42 am -> 2026-08-13 @ 6:00 pm |
| Onset: | 2026-08-13 @ 2:00 pm -> 2026-08-14 @ 1:00 am |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-08-13 @ 4:42 am |
| Headline: | Flash Flood Watch issued August 13 at 3:42AM MDT until August 14 at 12:00AM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Flash flooding and debris flows caused by excessive rainfall continue to be possible over the Pioneer Mountain Range burn scar. * WHERE...The Pioneer Mountain Range. * WHEN...From 1 PM MDT this afternoon through this evening. * IMPACTS...Heavy rainfall over the Pioneer Mountain Range burn scar is expected up to and during the period of the watch. Residents near the Pioneer Mountain Range burn scar should prepare for potential debris flow moving through the Pioneer Mountain Range. Be sure to stay up to date with information from local authorities. Heavy rainfall could trigger flash flooding of low-lying areas, and debris flows in and near recent wildfire burn scars. * ADDITIONAL DETAILS... - National Weather Service Meteorologists are forecasting heavy rainfall over the Pioneer Mountain burn scar, which may lead to flash flooding and debris flows. - For flood safety, go to this web page. http://www.weather.gov/safety/flood |
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-08-13 @ 12:17 am -> 2026-08-13 @ 1:00 pm |
| Onset: | 2026-08-13 @ 12:17 am -> 2026-08-13 @ 1:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-08-13 @ 12:17 am |
| Headline: | Lake Wind Advisory issued August 12 at 11:17PM MDT until August 13 at 12:00PM MDT by NWS Glasgow MT |
| Description: |
* WHAT...Northeast winds 15 to 25 mph with gusts up to 35 mph. * WHERE...Fort Peck Lake. * WHEN...Until noon MDT Thursday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. * ADDITIONAL DETAILS...Wave heights as high as 4 feet are possible. |
| Alert: | Air Quality Alert |
| Area(s): | Beaverhead, MT; Deer Lodge, MT; Granite, MT; Madison, MT; Missoula, MT; Ravalli, MT; Silver Bow, MT |
| Effective: | 2026-08-12 @ 9:15 am -> 2026-08-13 @ 10:00 am |
| Onset: | 2026-08-12 @ 9:15 am |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Great Falls MT on 2026-08-12 @ 9:20 am |
| Headline: | Air Quality Alert issued August 12 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, Granite, Silver Bow, Madison, Missoula, Ravalli counties in effect until 9AM on 08/13/2026 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 08/12/2026, particulate levels in Dillon are Unhealthy. As of 8AM on 08/12/2026, particulate levels in Frenchtown and Missoula are Unhealthy for Sensitive Groups. As of 8AM on 08/12/2026, particulate levels in Billings, Butte, Choteau, Columbia Falls, Cut Bank, Great Falls, Hamilton, Havre, Helena, Lewistown, Libby, Malta, Sleeping Giant, 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): | Flathead, MT; Gallatin, MT; Jefferson, MT; Lake, MT; Lewis and Clark, MT; Lincoln, MT; Mineral, MT; Park, MT; Powell, MT; Sanders, MT |
| Effective: | 2026-08-12 @ 9:15 am -> 2026-08-13 @ 10:00 am |
| Onset: | 2026-08-12 @ 9:15 am |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Great Falls MT on 2026-08-12 @ 9:20 am |
| Headline: | Air Quality Alert issued August 12 at 8:15AM MDT by NWS Great Falls MT |
| Description: |
AQAMT The Air Quality Alert for Flathead, Gallatin, Jefferson, Lake, Lewis and Clark, Lincoln, Mineral, Park, Powell and Sanders Counties has been cancelled. For more information visit the Montana Department of Environmental Quality at www.todaysair.mt.gov |