266
FNUS55 KMSO 211034
FWFMSO
FIRE WEATHER PLANNING FORECAST FOR WRN MONTANA AND N CNTRL IDAHO
NATIONAL WEATHER SERVICE MISSOULA MT
434 AM MDT THU AUG 21 2025
DISCUSSION
IDAHO (ZONES 102 AND 103): WARMING AND DRYING CONDITIONS ANTICIPATED FOR
THE NEXT SEVERAL DAYS. THE WINDS ARE EXPECTED TO BECOME NORTHERLY ON
FRIDAY, THEN THE WINDS BECOMING DIURNALLY DRIVEN BY
SUNDAY. SOME MONSOONAL MOISTURE WILL START TO CREEP INTO ZONE 103 ON
MONDAY CAUSING A FEW SHOWERS AND THUNDERSTORMS.
NORTHWEST MT (ZONES 104 AND 105): SEASONAL CONDITIONS EXPECTED TODAY
THEN AN EASTERLY WIND WILL DEVELOP TONIGHT. THE STRONGEST EAST WINDS
WILL BE ALONG THE CONTINENTAL DIVIDE. WARMING AND DRY CONDITIONS WILL
RETURN TO THE REGION BY THIS WEEKEND DUE TO A STRENGTHENING HIGH
PRESSURE.
WEST CENTRAL MT (ZONES 106, 107 AND 108): WARMING AND DRYING CONDITIONS
ANTICIPATED FOR THE NEXT SEVERAL DAYS. THE WINDS ARE EXPECTED TO BECOME
NORTHEASTERLY BY FRIDAY, THEN THE WINDS BECOMING DIURNALLY DRIVEN BY
SUNDAY.
SOUTHWEST MT (ZONES 109, 110 AND 111): WARMING AND DRYING CONDITIONS
ANTICIPATED FOR THE NEXT SEVERAL DAYS. THE WINDS ARE EXPECTED TO
BECOME NORTHERLY ON FRIDAY, THEN THE WINDS BECOMING DIURNALLY DRIVEN BY
SUNDAY. SOME MONSOONAL MOISTURE WILL START TO MOVE INTO THE REGION BY
SUNDAY CAUSING A FEW SHOWERS AND THUNDERSTORMS.
VIEW WEATHER BRIEFING VIDEOS ON OUR YOUTUBE CHANNEL
AT HTTPS://WWW.YOUTUBE.COM/NWSMISSOULA
IDZ102-103-221045-
PALOUSE/HELLS CANYON-CLEARWATER/NEZ PERCE-
334 AM PDT THU AUG 21 2025
TODAY
* SKY/WEATHER.........MOSTLY SUNNY. AREAS OF SMOKE IN THE MORNING.
* MAX TEMPERATURE.....90-100 VALLEYS AND 70-80 RIDGES.
* MIN HUMIDITY........13-23 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN
THE AFTERNOON.
* RIDGE TOP............EAST UP TO 5 MPH BECOMING NORTHWEST 5-10 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......3 KFT AGL UNTIL 1100. 8 KFT AGL AFTER 1300.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH.
* CHANCE LIGHTNING....0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
TONIGHT
* SKY/WEATHER.........MOSTLY CLEAR. AREAS OF SMOKE.
* MIN TEMPERATURE.....50-60.
* MAX HUMIDITY........45-55 PERCENT VALLEYS AND 37-47 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......NORTHWEST 5-10 MPH IN THE EVENING BECOMING
DOWNSLOPE/DOWNVALLEY 2-5 MPH.
* RIDGE TOP............NORTH 5-10 MPH BECOMING EAST AFTER MIDNIGHT.
* MIXING HEIGHT.......6 KFT AGL UNTIL 2000, THEN BELOW 500 FT TO 1
KFT AGL.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH.
* CHANCE LIGHTNING....0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
FRIDAY
* SKY/WEATHER.........MOSTLY SUNNY.
* MAX TEMPERATURE.....93-103 VALLEYS AND 75-85 RIDGES.
* MIN HUMIDITY........9-19 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO VARIABLE LESS THAN 7 MPH.
* RIDGE TOP............NORTHEAST 5-10 MPH.
* MIXING HEIGHT.......2 KFT AGL UNTIL 1100. 8 KFT AGL AFTER 1600.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH UNTIL 1600.
* CHANCE LIGHTNING....0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
SATURDAY
MOSTLY CLEAR. LOWS 55-65. HIGHS 90-100. MIN HUMIDITIES
15-25 PERCENT. EAST WINDS 5-10 MPH.
SUNDAY
PARTLY CLOUDY. LOWS 60-70. HIGHS 90-100. MIN HUMIDITIES
15-25 PERCENT. NORTHEAST WINDS 5-10 MPH.
MONDAY
PARTLY CLOUDY. LOWS 60-70. HIGHS 85-95. NORTHEAST WINDS
5-10 MPH.
TUESDAY
PARTLY CLOUDY. LOWS 60-70. HIGHS 85-95.
WEDNESDAY
PARTLY CLOUDY. LOWS 60-70. HIGHS 85-95.
MTZ104-105-221045-
KOOTENAI-FLATHEAD/GLACIER PARK-
434 AM MDT THU AUG 21 2025
TODAY
* SKY/WEATHER.........MOSTLY SUNNY.
* MAX TEMPERATURE.....80-90 VALLEYS AND 65-75 RIDGES.
* MIN HUMIDITY........11-21 PERCENT VALLEYS AND 21-31 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN
THE AFTERNOON.
* RIDGE TOP............WEST 5-10 MPH.
* MIXING HEIGHT.......2 KFT AGL UNTIL 1000. 9 KFT AGL AFTER 1300.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH UNTIL 0900, THEN
WEST 10 MPH.
* CHANCE LIGHTNING....0 PERCENT IN THE KOOTENAI...AND NEAR 0
PERCENT IN THE FLATHEAD/GLACIER PARK.
* CWR (> 0.10 INCH)...0 PERCENT.
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY.
* MIN TEMPERATURE.....45-55.
* MAX HUMIDITY........68-78 PERCENT VALLEYS AND 55-65 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......DOWNSLOPE/DOWNVALLEY 2-5 MPH.
* RIDGE TOP............NORTH 5-15 MPH BECOMING NORTHEAST 10-20 MPH
AFTER MIDNIGHT.
* MIXING HEIGHT.......8 KFT AGL UNTIL 1900. BELOW 500 FT TO 1 KFT
AGL AFTER 2000.
* TRANSPORT WINDS.....NORTHWEST 10 MPH UNTIL 2100. NORTHEAST 10 MPH
AFTER 0500.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
FRIDAY
* SKY/WEATHER.........PARTLY CLOUDY.
* MAX TEMPERATURE.....80-90 VALLEYS AND 63-73 RIDGES.
* MIN HUMIDITY........16-26 PERCENT VALLEYS AND 30-40 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......NORTHEAST 10-15 MPH.
* RIDGE TOP............EAST 10-15 MPH.
* MIXING HEIGHT.......3 KFT AGL UNTIL 1000. 7 KFT AGL AFTER 1300.
* TRANSPORT WINDS.....EAST 10 MPH.
* CHANCE LIGHTNING....0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
SATURDAY
CLEAR. LOWS 50-60. HIGHS 80-90. MIN HUMIDITIES
10-20 PERCENT. EAST WINDS 10-15 MPH.
SUNDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 80-90. MIN HUMIDITIES
10-20 PERCENT. NORTHEAST WINDS 10-15 MPH.
MONDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 80-90. NORTHEAST WINDS
5-10 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 55-65. HIGHS 80-90.
WEDNESDAY
MOSTLY CLEAR. LOWS 55-65. HIGHS 80-90.
MTZ106-108-221045-
WEST LOLO-EAST LOLO-
434 AM MDT THU AUG 21 2025
TODAY
* SKY/WEATHER.........MOSTLY SUNNY.
* MAX TEMPERATURE.....80-90 VALLEYS AND 73-83 RIDGES.
* MIN HUMIDITY........13-23 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO VARIABLE LESS THAN 7 MPH.
* RIDGE TOP............NORTHWEST 5-10 MPH.
* MIXING HEIGHT.......2 KFT AGL UNTIL 1000. 9 KFT AGL AFTER 1300.
* TRANSPORT WINDS.....WEST 10 MPH.
* CHANCE LIGHTNING....0 PERCENT IN THE WEST LOLO...AND NEAR 0
PERCENT IN THE EAST LOLO.
* CWR (> 0.10 INCH)...0 PERCENT.
TONIGHT
* SKY/WEATHER.........MOSTLY CLEAR. AREAS OF SMOKE.
* MIN TEMPERATURE.....45-55.
* MAX HUMIDITY........51-61 PERCENT VALLEYS AND 43-53 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......NORTH 5-10 MPH.
* RIDGE TOP............NORTH 5-10 MPH BECOMING NORTHEAST 5-15 MPH
AFTER MIDNIGHT.
* MIXING HEIGHT.......8 KFT AGL UNTIL 1900. BELOW 500 FT TO 1 KFT
AGL AFTER 2000.
* TRANSPORT WINDS.....NORTHWEST 10 MPH UNTIL 2200, THEN NORTHEAST
10 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
FRIDAY
* SKY/WEATHER.........MOSTLY SUNNY.
* MAX TEMPERATURE.....80-90 VALLEYS AND 73-83 RIDGES.
* MIN HUMIDITY........12-22 PERCENT VALLEYS AND 20-30 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO VARIABLE LESS THAN 7 MPH.
* RIDGE TOP............EAST 5-10 MPH.
* MIXING HEIGHT.......2 KFT AGL UNTIL 1000. 7 KFT AGL AFTER 1500.
* TRANSPORT WINDS.....EAST 10 MPH.
* CHANCE LIGHTNING....0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
SATURDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 85-95. MIN HUMIDITIES
15-25 PERCENT. EAST WINDS 10-15 MPH.
SUNDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 80-90. MIN HUMIDITIES
10-20 PERCENT. EAST WINDS 5-10 MPH.
MONDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 80-90. EAST WINDS 5-10 MPH.
TUESDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 80-90.
WEDNESDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 80-90.
MTZ107-221045-
FLATHEAD RESERVATION-
434 AM MDT THU AUG 21 2025
TODAY
* SKY/WEATHER.........MOSTLY SUNNY. AREAS OF SMOKE IN THE MORNING.
* MAX TEMPERATURE.....85-90 VALLEYS AND 65-70 RIDGES.
* MIN HUMIDITY........11-21 PERCENT VALLEYS AND 18-28 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN
THE AFTERNOON.
* RIDGE TOP............NORTHWEST 5-10 MPH.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1000. 10 KFT AGL AFTER
1400.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT IN AREAS WEST OF HIGHWAY
93...AND 0 PERCENT IN THE MISSION MTNS AND AREAS EAST OF HIGHWAY
93.
* CWR (> 0.10 INCH)...0 PERCENT.
TONIGHT
* SKY/WEATHER.........MOSTLY CLEAR. AREAS OF SMOKE IN THE EVENING.
* MIN TEMPERATURE.....50-55.
* MAX HUMIDITY........46-56 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......NORTH 5-10 MPH.
* RIDGE TOP............NORTHEAST 10-15 MPH.
* MIXING HEIGHT.......9 KFT AGL UNTIL 1900. BELOW 500 FT TO 1 KFT
AGL AFTER 2000.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH UNTIL 2000, THEN
NORTHEAST 10 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
FRIDAY
* SKY/WEATHER.........MOSTLY SUNNY.
* MAX TEMPERATURE.....85-90 VALLEYS AND 65-70 RIDGES.
* MIN HUMIDITY........14-24 PERCENT VALLEYS AND 23-33 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO VARIABLE LESS THAN 7 MPH.
* RIDGE TOP............NORTHEAST 5-10 MPH.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1000. 7 KFT AGL AFTER 1500.
* TRANSPORT WINDS.....NORTHEAST 10 MPH.
* CHANCE LIGHTNING....0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
SATURDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 85-95. MIN HUMIDITIES
10-20 PERCENT. NORTHEAST WINDS 10-15 MPH.
SUNDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 85-95. MIN HUMIDITIES
10-20 PERCENT. NORTHEAST WINDS 10-15 MPH.
MONDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 85-95. NORTHEAST WINDS
5-10 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 55-65. HIGHS 85-95.
WEDNESDAY
MOSTLY CLEAR. LOWS 55-65. HIGHS 85-95.
MTZ109-221045-
BITTERROOT-
434 AM MDT THU AUG 21 2025
TODAY
* SKY/WEATHER.........MOSTLY SUNNY. AREAS OF SMOKE IN THE MORNING.
* MAX TEMPERATURE.....85-90 VALLEYS AND 70-80 RIDGES.
* MIN HUMIDITY........16-26 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO VARIABLE LESS THAN 7 MPH.
* RIDGE TOP............NORTHEAST UP TO 5 MPH BECOMING NORTHWEST
5-10 MPH IN THE AFTERNOON.
* MIXING HEIGHT.......2 KFT AGL UNTIL 1000. 9 KFT AGL AFTER 1400.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH UNTIL 1400, THEN
WEST 10 MPH.
* CHANCE LIGHTNING....0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
TONIGHT
* SKY/WEATHER.........MOSTLY CLEAR. AREAS OF SMOKE.
* MIN TEMPERATURE.....45-55.
* MAX HUMIDITY........59-69 PERCENT VALLEYS AND 44-54 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......NORTH 5-10 MPH IN THE EVENING BECOMING
DOWNSLOPE/DOWNVALLEY 2-5 MPH.
* RIDGE TOP............NORTHEAST 5-10 MPH.
* MIXING HEIGHT.......7 KFT AGL UNTIL 1900. 1-2 KFT AGL AFTER 2000.
* TRANSPORT WINDS.....NORTH 10 MPH UNTIL 2400, THEN VARIABLE LESS
THAN 10 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT IN THE DARBY, SULA, AND WEST
FORK DISTRICTS...AND 0 PERCENT IN AREAS NORTH OF HAMILTON.
* CWR (> 0.10 INCH)...0 PERCENT.
FRIDAY
* SKY/WEATHER.........MOSTLY SUNNY.
* MAX TEMPERATURE.....85-90 VALLEYS AND 70-80 RIDGES.
* MIN HUMIDITY........14-24 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO VARIABLE LESS THAN 7 MPH.
* RIDGE TOP............NORTHEAST 5-10 MPH.
* MIXING HEIGHT.......3 KFT AGL UNTIL 1100. 8 KFT AGL AFTER 1600.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH UNTIL 1400, THEN
NORTH 10 MPH.
* CHANCE LIGHTNING....0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
SATURDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 80-90. MIN HUMIDITIES
15-25 PERCENT. EAST WINDS 5-10 MPH.
SUNDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 80-90. MIN HUMIDITIES
10-20 PERCENT. NORTHEAST WINDS 5-10 MPH.
MONDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 80-90. NORTHEAST WINDS
5-10 MPH.
TUESDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 80-90.
WEDNESDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF RAIN SHOWERS AND
THUNDERSTORMS. CHANCE OF PRECIPITATION 20 PERCENT. LOWS 55-65. HIGHS
80-90.
MTZ110-111-221045-
DEERLODGE/WEST BEAVERHEAD-EAST BEAVERHEAD-
434 AM MDT THU AUG 21 2025
TODAY
* SKY/WEATHER.........PARTLY CLOUDY. HAZE.
* MAX TEMPERATURE.....80-85 VALLEYS AND 70-75 RIDGES.
* MIN HUMIDITY........13-23 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO VARIABLE LESS THAN 7 MPH.
* RIDGE TOP............NORTH 5-10 MPH BECOMING NORTHWEST IN THE
AFTERNOON.
* MIXING HEIGHT.......2 KFT AGL UNTIL 1000. 11 KFT AGL AFTER 1600.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH UNTIL 1100, THEN
WEST 10 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY. HAZE.
* MIN TEMPERATURE.....38-48 VALLEYS AND 45-50 RIDGES.
* MAX HUMIDITY........68-78 PERCENT VALLEYS AND 50-60 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......NORTH 5-10 MPH.
* RIDGE TOP............NORTH 5-10 MPH.
* MIXING HEIGHT.......10 KFT AGL UNTIL 1900. BELOW 500 FT TO 1 KFT
AGL AFTER 2000.
* TRANSPORT WINDS.....NORTHWEST 10 MPH UNTIL 2000, THEN NORTH 10
MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
FRIDAY
* SKY/WEATHER.........PARTLY CLOUDY. HAZE IN THE MORNING.
* MAX TEMPERATURE.....75-85 VALLEYS AND 65-75 RIDGES.
* MIN HUMIDITY........17-27 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......NORTHEAST 5-15 MPH.
* RIDGE TOP............NORTHEAST 5-15 MPH.
* MIXING HEIGHT.......2 KFT AGL UNTIL 1000. 9 KFT AGL AFTER 1400.
* TRANSPORT WINDS.....NORTHEAST 10 MPH.
* CHANCE LIGHTNING....0 PERCENT IN THE DEERLODGE/WEST
BEAVERHEAD...AND NEAR 0 PERCENT IN THE EAST BEAVERHEAD.
* CWR (> 0.10 INCH)...0 PERCENT.
SATURDAY
MOSTLY CLEAR. LOWS 45-55. HIGHS 80-90. MIN HUMIDITIES
15-25 PERCENT. NORTHEAST WINDS 10-15 MPH.
SUNDAY
PARTLY CLOUDY. LOWS 50-60. HIGHS 75-85. MIN HUMIDITIES
10-20 PERCENT. NORTHEAST WINDS 10-15 MPH.
MONDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF RAIN SHOWERS. CHANCE OF
SHOWERS 20 PERCENT. LOWS 50-60. HIGHS 75-85. NORTHEAST WINDS 5-10 MPH.
TUESDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF RAIN SHOWERS AND
THUNDERSTORMS. CHANCE OF PRECIPITATION 20 PERCENT. LOWS 50-60. HIGHS
75-85.
WEDNESDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF RAIN SHOWERS AND
THUNDERSTORMS. CHANCE OF PRECIPITATION 20 PERCENT. LOWS 50-60. HIGHS
70-80.
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