Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Severe Thunderstorm Warning
Area(s): McCone, MT; Prairie, MT
Effective: 2026-09-07 @ 4:16 pm -> 2026-09-07 @ 4:45 pm
Onset: 2026-09-07 @ 4:16 pm -> 2026-09-07 @ 4:45 pm
Severity: Severe
Certainty: Observed
Urgency: Immediate
Issued By: NWS Glasgow MT on 2026-09-07 @ 4:16 pm
Headline: Severe Thunderstorm Warning issued September 7 at 3:16PM MDT until September 7 at 3:45PM MDT by NWS Glasgow MT
Description: At 315 PM MDT, a severe thunderstorm was located 10 miles southwest
of Brockway, or 21 miles southwest of Circle, moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Circle, Brockway, and Watkins.

Alert: Special Weather Statement
Area(s): Northern Rosebud; Custer
Effective: 2026-09-07 @ 3:52 pm -> 2026-09-07 @ 4:45 pm
Onset: 2026-09-07 @ 3:52 pm
Severity: Moderate
Certainty: Observed
Urgency: Expected
Issued By: NWS Billings MT on 2026-09-07 @ 3:52 pm
Headline: Special Weather Statement issued September 7 at 2:52PM MDT by NWS Billings MT
Description: At 252 PM MDT, Doppler radar was tracking gust front and line of
showers extending from 52 miles north of Miles City to 13 miles
northwest of Miles City, moving east at 45 mph.

HAZARD...Wind gusts of 40 to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.

Locations impacted include...
Miles City, Rosebud, Matthews Recreation Area, Strawberry Hill
Recreation Area, Angela, Hathaway, Rock Springs, Locate and
Cartersville.

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 @ 1:36 pm -> 2026-09-08 @ 7:00 am
Onset: 2026-09-07 @ 1:36 pm -> 2026-09-08 @ 1:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-09-07 @ 1:36 pm
Headline: Flood Watch issued September 7 at 12:36PM 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 flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.

* ADDITIONAL DETAILS...
- Periods of rain tonight through Tuesday morning could result in
flooding.
- 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.

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