Yellowstone National Park, Wyoming
Regional Weather Alerts
| Alert: | Special Weather Statement |
| Area(s): | Eastern Toole and Liberty; Hill County; Western and Central Chouteau County; Bears Paw Mountains and Southern Blaine; Fergus County below 4500ft |
| Effective: | 2026-09-07 @ 9:04 am -> 2026-09-07 @ 10:00 am |
| Onset: | 2026-09-07 @ 9:04 am |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-09-07 @ 9:04 am |
| Headline: | Special Weather Statement issued September 7 at 8:04AM MDT by NWS Great Falls MT |
| Description: |
At 803 AM MDT, trained weather spotters reported strong thunderstorms along a line extending from near The Knees to 10 miles northeast of Fort Benton to 10 miles east of Geraldine. Movement was northeast at 50 mph. HAZARD...Wind gusts up to 40 mph and brief heavy rainfall. SOURCE...Trained weather spotters. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Rainfall amounts of 0.20 to 0.50 are likely with this band of rain. Locations impacted include... Big Sandy, Azure, Parker School, Agency, St. Pierre, The Knees, Sangrey, Boneau, Box Elder, Rocky Boy, Loma, Kenilworth, Judith Landing, Iliad, and Virgelle. |
| Alert: | Flood Advisory |
| Area(s): | Cascade, MT |
| Effective: | 2026-09-07 @ 8:59 am -> 2026-09-07 @ 11:00 am |
| Onset: | 2026-09-07 @ 8:59 am -> 2026-09-07 @ 11:00 am |
| Severity: | Minor |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-09-07 @ 8:59 am |
| Headline: | Flood Advisory issued September 7 at 7:59AM MDT until September 7 at 10:00AM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Urban area and small stream flooding caused by excessive rainfall is expected. * WHERE...North Central Cascade County in central Montana... * WHEN...Until 1000 AM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 757 AM MDT, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms. This is causing urban and small stream flooding. Between 0.3 and 0.5 inches of rain have fallen. - Additional rainfall amounts of 0.1 to 0.3 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Great Falls, Black Eagle, Malmstrom Afb, First Peoples Buffalo Jump State Park and Vaughn. - Minor flooding is occurring on the Northwest Bypass in Great Falls. - http://www.weather.gov/safety/flood |
| Alert: | Special Weather Statement |
| Area(s): | Eastern Pondera and Eastern Teton; Western and Central Chouteau County; Cascade County below 5000ft; Judith Basin County and Judith Gap; Fergus County below 4500ft; Little Belt and Highwood Mountains |
| Effective: | 2026-09-07 @ 8:11 am -> 2026-09-07 @ 9:15 am |
| Onset: | 2026-09-07 @ 8:11 am |
| Severity: | Moderate |
| Certainty: | Observed |
| Urgency: | Expected |
| Issued By: | NWS Great Falls MT on 2026-09-07 @ 8:11 am |
| Headline: | Special Weather Statement issued September 7 at 7:11AM MDT by NWS Great Falls MT |
| Description: |
At 710 AM MDT, trained weather spotters reported strong thunderstorms along a line extending from 10 miles southeast of Power to near Geyser. Movement was northeast at 30 mph. HAZARD...Wind gusts up to 40 mph and a short period of heavy rainfall. SOURCE...Trained weather spotters. Wind gusts near 40 mph were reported at the Great Falls Airport, with rainfall up to a quarter of an inch in less than one hour. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Some areas could receive up to one half inch of rainfall with this line of storms. Locations impacted include... Great Falls, Fort Benton, Belt, Geraldine, Black Eagle, Geyser, Highwood, Carter, Floweree, Raynesford, Portage, Malmstrom Afb, Stockett, Tracy, Vaughn, First Peoples Buffalo Jump State Park, Sun River, Centerville, Shonkin, and Armington. |
| 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: | 2026-09-07 @ 7:01 am -> 2026-09-07 @ 3:15 pm |
| Onset: | 2026-09-07 @ 7:01 am -> 2026-09-08 @ 1:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Great Falls MT on 2026-09-07 @ 7:01 am |
| Headline: | Flood Watch issued September 7 at 6:01AM MDT until September 8 at 12:00PM MDT by NWS Great Falls MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall continues to be 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...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: | Hydrologic Outlook |
| Area(s): | Flathead, MT; Lake, MT; Missoula, MT |
| Effective: | 2026-09-07 @ 5:02 am -> 2026-09-08 @ 5:15 am |
| Onset: | 2026-09-07 @ 5:02 am |
| Severity: | Unknown |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Missoula MT on 2026-09-07 @ 5:02 am |
| Headline: | Hydrologic Outlook issued September 7 at 4:02AM MDT by NWS Missoula MT |
| Description: |
ESFMSO What: Widespread moderate rainfall over a prolonged period of time. Storm total amounts between 1 to 2 inches for valleys and 2 to 3 inches for the mountains. Where: Flathead and Lake Counties in northwest Montana, including Glacier National Park. Missoula county in west-central Montana. Timing: Continuing through Tuesday morning. The heaviest rainfall rates are anticipated today and tonight. 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: | Flood Watch |
| Area(s): | West Glacier Region; Flathead/Mission Valleys; Potomac/Seeley Lake Region |
| Effective: | 2026-09-07 @ 4:59 am -> 2026-09-08 @ 7:00 am |
| Onset: | 2026-09-07 @ 4:59 am -> 2026-09-08 @ 1:00 pm |
| Severity: | Severe |
| Certainty: | Possible |
| Urgency: | Future |
| Issued By: | NWS Missoula MT on 2026-09-07 @ 4:59 am |
| Headline: | Flood Watch issued September 7 at 3:59AM MDT until September 8 at 12:00PM MDT by NWS Missoula MT |
| Description: |
* WHAT...Flooding caused by excessive rainfall continues to be 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...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... - Prolonged moderate to heavy rainfall is expected through Tuesday morning with an additional 1 to 2 inches in the valleys, and over 3 inches in the higher terrain, especially along the Continental Divide and in Glacier National Park. - https://www.weather.gov/mso/hydrology |
| Alert: | Lake Wind Advisory |
| Area(s): | Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone |
| Effective: | 2026-09-06 @ 2:39 pm -> 2026-09-07 @ 1:00 pm |
| Onset: | 2026-09-07 @ 3:00 pm -> 2026-09-09 @ 1:00 am |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Glasgow MT on 2026-09-06 @ 2:39 pm |
| Headline: | Lake Wind Advisory issued September 6 at 1:39PM MDT until September 9 at 12:00AM MDT by NWS Glasgow MT |
| Description: |
* WHAT...West winds 20 to 30 mph with gusts up to 45 mph expected. * WHERE...Fort Peck Lake. * WHEN...From 2 PM Monday to midnight MDT Tuesday Night. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. * ADDITIONAL DETAILS...Waves as high as 5 feet. |
| 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. |
