Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Special Weather Statement
Area(s): Cascade County below 5000ft; Judith Basin County and Judith Gap; Little Belt and Highwood Mountains
Effective: 2026-09-13 @ 8:37 pm -> 2026-09-13 @ 9:15 pm
Onset: 2026-09-13 @ 8:37 pm
Severity: Moderate
Certainty: Observed
Urgency: Expected
Issued By: NWS Great Falls MT on 2026-09-13 @ 8:37 pm
Headline: Special Weather Statement issued September 13 at 7:37PM MDT by NWS Great Falls MT
Description: At 737 PM MDT, Doppler radar was tracking a strong thunderstorm 18
miles southwest of Belt, or 26 miles south of Great Falls, moving
northeast at 40 mph.

HAZARD...Wind gusts up to 40 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.

Locations impacted include...
Belt, Geyser, Sluice Boxes State Park, Raynesford, and Armington.

Alert: High Wind Watch
Area(s): Judith Basin County and Judith Gap; Fergus County below 4500ft; Snowy and Judith Mountains
Effective: 2026-09-13 @ 6:48 pm -> 2026-09-14 @ 10:00 am
Onset: 2026-09-14 @ 10:00 am -> 2026-09-14 @ 7:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Great Falls MT on 2026-09-13 @ 6:48 pm
Headline: High Wind Watch issued September 13 at 5:48PM MDT until September 14 at 6:00PM MDT by NWS Great Falls MT
Description: * WHAT...West to northwest winds 25 to 35 mph with gusts up to 60 mph
possible.

* WHERE...Snowy and Judith Mountains, Fergus County below 4500ft, and
Judith Basin County and Judith Gap.

* WHEN...From Monday morning through Monday afternoon.

* IMPACTS...Travel could be difficult, especially for high profile
vehicles.

Alert: Lake Wind Advisory
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
Effective: 2026-09-13 @ 11:58 am -> 2026-09-14 @ 7:00 am
Onset: 2026-09-13 @ 11:58 am -> 2026-09-15 @ 1:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-09-13 @ 11:58 am
Headline: Lake Wind Advisory issued September 13 at 10:58AM MDT until September 15 at 12:00AM MDT by NWS Glasgow MT
Description: * WHAT...Southeast winds of 15 to 25 mph, gusting to 35 mph through
Sunday evening before briefly diminishing at night. Winds on Monday
will increase to 20 to 30 mph, gusting to 45 mph.

* WHERE...Fort Peck Lake.

* WHEN...Until midnight MDT Monday Night.

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

* ADDITIONAL DETAILS...Wave heights as high as 4 to 5 feet on Monday.

Alert: Red Flag Warning
Area(s): Eastern Beaverhead National Forest
Effective: 2026-09-12 @ 10:15 am -> 2026-09-13 @ 10:00 pm
Onset: 2026-09-13 @ 1:00 pm -> 2026-09-13 @ 10:00 pm
Severity: Severe
Certainty: Likely
Urgency: Expected
Issued By: NWS Missoula MT on 2026-09-12 @ 10:15 am
Headline: Red Flag Warning issued September 12 at 9:15AM MDT until September 13 at 9:00PM MDT by NWS Missoula MT
Description: ...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT SUNDAY DUE TO
WIND AND LOW RELATIVE HUMIDITY FOR EAST BEAVERHEAD...

The National Weather Service in Missoula MT has issued a Red Flag
Warning in effect from noon to 9 PM MDT Sunday.

* AFFECTED AREA...Fire Weather Zone 111.

* TIMING...From noon to 9 PM MDT Sunday.

* WINDS...Southwest winds 20 to 30 mph with gusts up to 45 mph.

* RELATIVE HUMIDITY...Relative Humidity between 15 to 25 percent.

* IMPACTS...Any fires that develop will spread rapidly. Outdoor
burning is not recommended.

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