Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Flood Watch |
| Area(s): | East Glacier Park Region; Northern High Plains; Eastern Glacier, Western Toole, and Central Pondera; Eastern Toole and Liberty; Southern Rocky Mountain Front; Southern High Plains; Eastern Pondera and Eastern Teton |
| Effective: | 2026-09-06 @ 12:32 pm -> 2026-09-07 @ 7:15 am |
| Onset: | 2026-09-06 @ 4:00 pm -> 2026-09-08 @ 1:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-09-06 @ 12:32 pm |
| Headline: | Flood Watch issued September 6 at 11:32AM MDT until September 8 at 12:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...A portion of north central Montana, including the following areas, East Glacier Park Region, Eastern Glacier, Western Toole, and Central Pondera, Eastern Pondera and Eastern Teton, Eastern Toole and Liberty, Northern High Plains, Southern High Plains and Southern Rocky Mountain Front. * WHEN...From 3 PM MDT this afternoon through Tuesday morning. * IMPACTS...Excessive runoff may result in minor flooding of creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage areas. Rural gravel and dirt roads can become muddy and may become difficult to travel. Rock/debris slides are possible in the mountains. * ADDITIONAL DETAILS... - Thunderstorms today will be capable of producing 0.50 to 1 inch per hour rain rates. Periods of moderate to heavy rainfall will be possible Monday through Tuesday morning. Widespread 0.75 to 1.5 inches of rain have already fallen along the Rocky Mountain Front over the past 24 hours. Additional widespread rain accumulations of 1 to 3 inches are possible along the Rocky Mountain Front and Sweet Grass Hills with isolated 4 inches possible along and north of US Highway 2 this afternoon through Tuesday morning. - http://www.weather.gov/safety/flood |
| Alert: | Flood Watch |
| Area(s): | West Glacier Region; Flathead/Mission Valleys; Potomac/Seeley Lake Region |
| Effective: | 2026-09-06 @ 10:51 am -> 2026-09-08 @ 1:00 pm |
| Onset: | 2026-09-06 @ 4:00 pm -> 2026-09-08 @ 1:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Missoula MT on 2026-09-06 @ 10:51 am |
| Headline: | Flood Watch issued September 6 at 9:51AM MDT until September 8 at 12:00PM MDT by NWS Missoula MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...Portions of northwest and west central Montana, including the following areas, in northwest Montana, Flathead/Mission Valleys and West Glacier Region. In west central Montana, Potomac/Seeley Lake Region. * WHEN...From 3 PM MDT this afternoon through Tuesday morning. * IMPACTS...Excessive runoff may result in flooding of creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Thunderstorms capable of rainfall rates of 0.75" to 1.00" per hour are possible this afternoon and evening (Sept 6), which could lead to localized debris flows. This period will then be followed by prolonged moderate to heavy rainfall Monday into Tuesday morning of an additional 1 to 3 inches in the valleys, with 2 to 4 inches in the higher terrain, especially along the Continental Divide and in Glacier National Park. - https://www.weather.gov/mso/hydrology |
| Alert: | Red Flag Warning |
| Area(s): | Eastern Beaverhead National Forest |
| Effective: | 2026-09-05 @ 3:40 pm -> 2026-09-06 @ 10:00 pm |
| Onset: | 2026-09-06 @ 1:00 pm -> 2026-09-06 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Missoula MT on 2026-09-05 @ 3:40 pm |
| Headline: | Red Flag Warning issued September 5 at 2:40PM MDT until September 6 at 9:00PM MDT by NWS Missoula MT |
| Description: |
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT SUNDAY DUE TO WIND AND LOW RELATIVE HUMIDITY FOR EAST BEAVERHEAD... * AFFECTED AREA...Fire Weather Zone 111. * TIMING...From noon to 9 PM MDT Sunday. * WINDS...South winds 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...Relative Humidity between 15 to 25 percent. * IMPACTS...Any fires that develop will spread rapidly. Outdoor burning is not recommended. |
| Alert: | Hydrologic Outlook |
| Area(s): | Flathead, MT; Lake, MT; Missoula, MT |
| Effective: | 2026-09-05 @ 11:43 am -> 2026-09-08 @ 6:00 am |
| Onset: | 2026-09-05 @ 11:43 am |
| Severity: | Unknown |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Missoula MT on 2026-09-05 @ 11:43 am |
| Headline: | Hydrologic Outlook issued September 5 at 10:43AM MDT by NWS Missoula MT |
| Description: |
ESFMSO What: Widespread moderate rainfall over a prolonged period of time. Storm total amounts between 1 to 3 inches for valleys and 2 to 3 inches for the mountains. There is a 10 percent chance of isolated rainfall amounts up to 4 inches along the Continental Divide. Where: Flathead and Lake Counties in northwest Montana, including Glacier National Park. Missoula county in west-central Montana. Timing: Beginning Sunday morning, continuing through Monday night. Heaviest rainfall rates anticipated Monday into Monday night. Significant rainfall totals will bring potential for rapid rises on streams and creeks, rock and debris slides and runoff issues in poor drainage areas. Those recreating in the backcountry should take caution on backcountry roadways for falling debris. |
