Yellowstone National Park, Wyoming
Regional Weather Alerts
| 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. |
| Alert: | Hydrologic Outlook |
| Area(s): | Blaine, MT; Cascade, MT; Chouteau, MT; Fergus, MT; Glacier, MT; Hill, MT; Judith Basin, MT; Lewis and Clark, MT; Liberty, MT; Meagher, MT; Pondera, MT; Teton, MT; Toole, MT |
| Effective: | 2026-09-05 @ 11:40 am -> 2026-09-06 @ 1:00 pm |
| Onset: | 2026-09-05 @ 11:40 am |
| Severity: | Unknown |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-09-05 @ 11:40 am |
| Headline: | Hydrologic Outlook issued September 5 at 10:40AM MDT by NWS Great Falls MT |
| Description: |
ESFTFX Periods of rain are expected to begin on Sunday along the Rocky Mountain Front and then spread eastward out over the plains of North Central MT by Sunday night. Overall, total rainfall amounts of 1 to 3 inches will be common over North Central MT from Sunday through Monday, including the east side of Glacier Park. There is a 10 percent chance of isolated rainfall amounts up to 4 inches. At this time no significant flooding is expected. However, in areas that do receive closer to 3 inches or more of rainfall, some minor field or small stream flooding can not be ruled out. Additionally, some rocks could wash down on to roadways near mountains. Those planning outdoor activities over the next few days should be prepared for periods of rain. |
