Yellowstone National Park, Wyoming

Regional Weather Alerts


     

Alert: Fire Weather Watch
Area(s): Kootenai National Forest/Talley Lake District/fnf; Western Lolo National Forest; Salish and Kootenai Indian Reservation
Effective: 2026-08-21 @ 5:30 pm -> 2026-08-22 @ 1:30 am
Onset: 2026-08-22 @ 6:00 pm -> 2026-08-23 @ 1:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Missoula MT on 2026-08-21 @ 5:30 pm
Headline: Fire Weather Watch issued August 21 at 4:30PM MDT until August 23 at 12:00PM MDT by NWS Missoula MT
Description: ...FIRE WEATHER WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH
SUNDAY MORNING DUE TO LIGHTNING FOR KOOTENAI, WEST LOLO, AND FLATHEAD
RESERVATION...

...FIRE WEATHER WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY
EVENING DUE TO WIND AND LOW RELATIVE HUMIDITY FOR DEERLODGE/WEST
BEAVERHEAD AND EAST BEAVERHEAD...

...

.Antecedent conditions have been very dry and warm. The Kootenai
Forest especially has received well below normal precipitation since
early July. Thunderstorms with little to no precipitation Saturday
evening and overnight will be followed Sunday with a dry cold front.
Increased winds and lowering relative humidities behind the front on
Sunday will potentially bring critical fire weather conditions to
southwest Montana.

The National Weather Service in Missoula MT has issued a Fire Weather
Watch.

* AFFECTED AREA...Fire Weather Zones 104, 106, and 107.

* TIMING...From Saturday afternoon through Sunday morning.

* LIGHTNING...Afternoon and evening thunderstorms will transition to
nocturnal thunderstorms. Dry surface conditions could lead to
lightning producing storms with little to no precipitation.

* OUTFLOW WINDS...Through 9 pm erratic winds 25 to 40 mph.

* IMPACTS...Lightning strikes will have the potential to start new
fires, and gusty outflow winds could cause rapid spread of new and
existing wildfires.

Alert: Fire Weather Watch
Area(s): Deerlodge/Western Beaverhead National Forest; Eastern Beaverhead National Forest
Effective: 2026-08-21 @ 5:30 pm -> 2026-08-22 @ 1:30 am
Onset: 2026-08-23 @ 1:00 pm -> 2026-08-23 @ 10:00 pm
Severity: Severe
Certainty: Possible
Urgency: Future
Issued By: NWS Missoula MT on 2026-08-21 @ 5:30 pm
Headline: Fire Weather Watch issued August 21 at 4:30PM MDT until August 23 at 9:00PM MDT by NWS Missoula MT
Description: ...FIRE WEATHER WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH
SUNDAY MORNING DUE TO LIGHTNING FOR KOOTENAI, WEST LOLO, AND FLATHEAD
RESERVATION...

...FIRE WEATHER WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY
EVENING DUE TO WIND AND LOW RELATIVE HUMIDITY FOR DEERLODGE/WEST
BEAVERHEAD AND EAST BEAVERHEAD...

...

.Antecedent conditions have been very dry and warm. The Kootenai
Forest especially has received well below normal precipitation since
early July. Thunderstorms with little to no precipitation Saturday
evening and overnight will be followed Sunday with a dry cold front.
Increased winds and lowering relative humidities behind the front on
Sunday will potentially bring critical fire weather conditions to
southwest Montana.

The National Weather Service in Missoula MT has issued a Fire Weather
Watch.

* AFFECTED AREA...Fire Weather Zones 110 and 111.

* TIMING...From Sunday afternoon through Sunday evening.

* WINDS...Southwest winds 10 to 20 mph with gusts up to 35 mph.

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

* IMPACTS...Any new or existing fires may spread rapidly.

Alert: Lake Wind Advisory
Area(s): Central and Southeast Phillips; Central and Southern Valley; Petroleum; Garfield; McCone
Effective: 2026-08-21 @ 1:39 pm -> 2026-08-22 @ 5:00 am
Onset: 2026-08-22 @ 1:00 pm -> 2026-08-23 @ 4:00 am
Severity: Moderate
Certainty: Likely
Urgency: Expected
Issued By: NWS Glasgow MT on 2026-08-21 @ 1:39 pm
Headline: Lake Wind Advisory issued August 21 at 12:39PM MDT until August 23 at 3:00AM MDT by NWS Glasgow MT
Description: * WHAT...Southeast winds 15 to 20 mph with gusts up to 30 mph
expected.

* WHERE...Fort Peck Lake.

* WHEN...From noon Saturday to 3 AM MDT Sunday.

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

* ADDITIONAL DETAILS...Wave heights up to 3 feet.