Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Lake Wind Advisory
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
Effective: 2026-05-31 @ 1:03 am -> 2026-05-31 @ 5:00 pm
Onset: 2026-05-31 @ 1:00 pm -> 2026-06-01 @ 7:00 pm
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-05-31 @ 1:03 am
Headline: Lake Wind Advisory issued May 31 at 12:03AM MDT until June 1 at 6:00PM MDT by NWS Glasgow MT
Description: * WHAT...West winds 15 to 25 mph with gusts up to 40 mph expected.

* WHERE...Fort Peck Lake.

* WHEN...From noon today to 6 PM MDT Monday.

* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft.

* ADDITIONAL DETAILS...Look for wave heights in excess of 4 feet.

Alert: Hydrologic Outlook
Area(s): Granite, MT; Missoula, MT; Powell, MT
Effective: 2026-05-30 @ 2:43 pm -> 2026-05-31 @ 2:45 pm
Onset: 2026-05-30 @ 2:43 pm
Severity: Unknown
Certainty: Possible
Urgency: Future
Issued By: NWS Missoula MT on 2026-05-30 @ 2:43 pm
Headline: Hydrologic Outlook issued May 30 at 1:43PM MDT by NWS Missoula MT
Description: ESFMSO

What: Widespread Moderate to Heavy Precipitation

Where: West-Central Montana Counties: Missoula, Granite and Powell.

Timing: Saturday May 30 through Monday June 1, 2026

Relevant factors:
Total precipitation amounts of 0.5 to 2 inches with locally
higher amounts possible in higher terrain along the Divide.
Ongoing snowmelt and recent precipitation has kept stream and
river levels rising. Anticipate further rises in local
waterways, rockfall and mudslide potential in steep terrain,
as well as possible urban and low-land flooding.

Alert: Flood Watch
Area(s): West Glacier Region; Flathead/Mission Valleys
Effective: 2026-05-30 @ 1:02 pm -> 2026-05-31 @ 1:15 pm
Onset: 2026-05-30 @ 7:00 pm -> 2026-06-01 @ 1:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Missoula MT on 2026-05-30 @ 1:02 pm
Headline: Flood Watch issued May 30 at 12:02PM MDT until June 1 at 12:00PM MDT by NWS Missoula MT
Description: * WHAT...Flooding caused by rain and snowmelt continues to be
possible.

* WHERE...A portion of northwest Montana, including the following
areas, Flathead/Mission Valleys and West Glacier Region.

This includes the following Specific Areas...
Kalispell and Going-to-the-Sun Road in Glacier Park.

* WHEN...From 6 PM MDT this evening through Monday morning.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Rockfall and debris flows are also possible in steep terrain.

* ADDITIONAL DETAILS...
- Rainfall of 1 to 2 inches for valley locations with 2 to 4 inches
in the terrain are possible late Saturday through Monday.
- https://www.weather.gov/mso/hydrology

Alert: Flood Watch
Area(s): Flathead, MT
Effective: 2026-05-30 @ 1:01 pm -> 2026-05-31 @ 1:15 pm
Onset: 2026-05-30 @ 1:01 pm -> 2026-06-01 @ 7:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Missoula MT on 2026-05-30 @ 1:01 pm
Headline: Flood Watch issued May 30 at 12:01PM MDT until June 1 at 6:00AM MDT by NWS Missoula MT
Description: ...The Flood Watch continues for the following rivers in Montana...

Flathead River At Columbia Falls affecting Flathead County.

For the Flathead River...including At Columbia Falls...flooding is
possible.

* WHAT...Flooding is possible.

* WHERE...Flathead River At Columbia Falls.

* WHEN...Until Monday morning.

* IMPACTS...At 13.0 feet, Farmers crops adjacent to the Flathead
River are inundated with water. At 14.0 feet, Flooding of farmers
crops adjacent to the Flathead River is likely. Sections of the
Steel Bridge Road become inundated with water and impassable.

* ADDITIONAL DETAILS...
- At 10:45 AM MDT Saturday the stage was 13.8 feet.
- Recent Activity...The maximum river stage in the 24 hours ending
at 10:45 AM MDT Saturday was 13.8 feet.
- Forecast...Flood stage may be reached based on the latest
forecast information.
- Flood stage is 14.0 feet. Forecast crest is 14.1 feet on Saturday
afternoon.
- https://www.weather.gov/mso/hydrology

Alert: Flood Watch
Area(s): Flathead, MT; Lake, MT; Missoula, MT
Effective: 2026-05-30 @ 1:00 pm -> 2026-05-31 @ 1:00 pm
Onset: 2026-06-01 @ 11:25 am -> 2026-06-03 @ 12:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Missoula MT on 2026-05-30 @ 1:00 pm
Headline: Flood Watch issued May 30 at 12:00PM MDT until June 2 at 11:00PM MDT by NWS Missoula MT
Description: ...The Flood Watch continues for the following rivers in Montana...

Swan River Near Bigfork affecting Lake, Missoula and Flathead
Counties.

* WHAT...Flooding is possible.

* WHERE...Swan River Near Bigfork.

* WHEN...From Monday morning to Tuesday evening.

* IMPACTS...At 6.5 feet, Flooding affects low lying areas adjacent to
the river. At 6.6 feet, Flooding affects low lying areas north of
Lion Creek Road and adjacent to the river.

* ADDITIONAL DETAILS...
- At 11:00 AM MDT Saturday the stage was 5.2 feet.
- Forecast...Rises on the river are possible over the next few
days. The river may reach flood stage.
- Flood stage is 6.5 feet.
- https://www.weather.gov/mso/hydrology

Alert: Flood Watch
Area(s): Missoula, MT
Effective: 2026-05-30 @ 12:58 pm -> 2026-05-31 @ 1:00 pm
Onset: 2026-05-31 @ 9:51 pm -> 2026-06-05 @ 2:00 am
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Missoula MT on 2026-05-30 @ 12:58 pm
Headline: Flood Watch issued May 30 at 11:58AM MDT until June 5 at 1:00AM MDT by NWS Missoula MT
Description: ...The Flood Watch continues for the following rivers in Montana...

Clark Fork River Above Missoula affecting Missoula County.

* WHAT...Flooding is possible.

* WHERE...Clark Fork River Above Missoula.

* WHEN...From Sunday evening to late Thursday night.

* IMPACTS...At 7.5 feet, Flooding of low lying areas adjacent to the
river is possible. Flood waters begin to flood streets in the
Orchard Homes area, specifically the north end of Tower Street
including Kehrwald Drive.


* ADDITIONAL DETAILS...
- At 11:00 AM MDT Saturday the stage was 6.2 feet.
- Forecast...Rises on the river are possible over the next few
days. The river may reach flood stage.
- Flood stage is 7.5 feet.
- https://www.weather.gov/mso/hydrology

Alert: Flood Watch
Area(s): East Glacier Park Region; Northern High Plains; Eastern Glacier, Western Toole, and Central Pondera; Southern Rocky Mountain Front; Southern High Plains; Eastern Pondera and Eastern Teton; Cascade County below 5000ft; Gates of the Mountains
Effective: 2026-05-30 @ 12:46 pm -> 2026-05-31 @ 6:15 am
Onset: 2026-05-30 @ 1:00 pm -> 2026-06-01 @ 7:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-05-30 @ 12:46 pm
Headline: Flood Watch issued May 30 at 11:46AM MDT until June 1 at 6:00PM MDT by NWS Great Falls MT
Description: * WHAT...Flooding caused by excessive rainfall continues to be
possible.

* WHERE...Portions of central and north central Montana, including
the following areas, in central Montana, Gates of the Mountains.
In north central Montana, Cascade County below 5000ft, East
Glacier Park Region, Eastern Glacier, Western Toole, and Central
Pondera, Eastern Pondera and Eastern Teton, Northern High Plains,
Southern High Plains and Southern Rocky Mountain Front.

* WHEN...Through Monday afternoon.

* IMPACTS...Excessive runoff may result in flooding of rivers,
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...
- Rainfall amounts of 1 to 2 inches are expected with a 10%
chance for 3 inches are possible in localized areas. The
steadiest period of moderate to locally heavy rainfall will
occur between late this afternoon through Sunday morning.
Light rainfall lingers Sunday afternoon through at least
Monday. The greatest impacts will be along creeks and rivers
emanating from the Rocky Mountain Front, including but not
limited to Badger Creek, Sun River, Marias River, and Saint
Mary River. Some unpaved rural roads may become impassable.
In addition, isolated thunderstorms are possible through this
evening with brief intense precipitation rates which will be
monitored for potential impacts in more sensitive locations
such as burn scars and areas of steep terrain.
- http://www.weather.gov/safety/flood

Alert: Winter Weather Advisory
Area(s): Absaroka/Beartooth Mountains
Effective: 2026-05-30 @ 10:44 am -> 2026-05-31 @ 10:45 am
Onset: 2026-05-31 @ 1:00 am -> 2026-06-01 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Billings MT on 2026-05-30 @ 10:44 am
Headline: Winter Weather Advisory issued May 30 at 9:44AM MDT until June 1 at 12:00AM MDT by NWS Billings MT
Description: * WHAT...Snow showers expected for the Beartooth Highway. Total snow
accumulation of 1 to 3 inches above 9000 feet.

* WHERE...Absaroka/Beartooth Mountains.

* WHEN...From midnight tonight to midnight MDT Sunday Night.

* IMPACTS...Travel on the Beartooth Highway will be impacted by
wintry conditions, mainly at elevations above Vista Point. Be sure
to monitor the weather and road conditions.

* ADDITIONAL DETAILS...Those with recreation plans in the high
country should be prepared for wintry conditions.