298
FNUS55 KMSO 221022
FWFMSO
FIRE WEATHER PLANNING FORECAST FOR WRN MONTANA AND N CNTRL IDAHO
NATIONAL WEATHER SERVICE MISSOULA MT
422 AM MDT SAT AUG 22 2026
...HEAT ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO 7 PM PDT THIS
EVENING FOR PORTIONS OF PALOUSE/HELLS CANYON...
...FIRE WEATHER WATCH IN EFFECT FROM THIS AFTERNOON THROUGH SUNDAY
MORNING FOR PORTIONS OF KOOTENAI...WEST LOLO...FLATHEAD RESERVATION...
...FIRE WEATHER WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY
EVENING FOR PORTIONS OF DEERLODGE/WEST BEAVERHEAD...EAST BEAVERHEAD...
DISCUSSION
IDAHO (ZONES 102 AND 103): MORNING LIGHT RAIN SHOWERS WILL GIVE WAY TO
NUMEROUS AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS TRACKING FROM
SOUTHWEST TO NORTHEAST TODAY. A MARGINAL RISK FOR SEVERE STRENGTH
OUTFLOW WINDS EXISTS ALONGSIDE FREQUENT LIGHTNING AND LOCALIZED HEAVY
RAINFALL. A COLD FRONT TONIGHT INTO SUNDAY BRINGS COOLER DAYTIME
TEMPERATURES BUT DEEP BOUNDARY-LAYER MIXING PRODUCING STRONG WESTERLY
WINDS AMIDST A VERY DRY AIRMASS RESULTING IN ELEVATED TO NEAR-CRITICAL
FIRE WEATHER CONDITIONS.
NORTHWEST MT (ZONES 104 AND 105): MORNING LIGHT RAIN SHOWERS WILL GIVE WAY TO
NUMEROUS AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS TRACKING FROM
SOUTHWEST TO NORTHEAST TODAY. A MARGINAL RISK FOR SEVERE STRENGTH
OUTFLOW WINDS EXISTS ALONGSIDE FREQUENT LIGHTNING AND LOCALIZED HEAVY
RAINFALL. A COLD FRONT TONIGHT INTO SUNDAY BRINGS COOLER DAYTIME
TEMPERATURES BUT DEEP BOUNDARY-LAYER MIXING PRODUCING STRONG WESTERLY
WINDS AMIDST A VERY DRY AIRMASS RESULTING IN NEAR-CRITICAL TO CRITICAL
FIRE WEATHER CONDITIONS.
WEST CENTRAL MT (ZONES 106, 107 AND 108): MORNING LIGHT RAIN SHOWERS WILL GIVE WAY TO
NUMEROUS AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS TRACKING FROM
SOUTHWEST TO NORTHEAST TODAY. A MARGINAL RISK FOR SEVERE STRENGTH
OUTFLOW WINDS EXISTS ALONGSIDE FREQUENT LIGHTNING AND LOCALIZED HEAVY
RAINFALL. A COLD FRONT TONIGHT INTO SUNDAY BRINGS COOLER DAYTIME
TEMPERATURES BUT DEEP BOUNDARY-LAYER MIXING PRODUCING STRONG WESTERLY
WINDS AMIDST A VERY DRY AIRMASS RESULTING IN WIDESPREAD NEAR-CRITICAL TO
CRITICAL FIRE WEATHER CONDITIONS.
SOUTHWEST MT (ZONES 109, 110 AND 111): MORNING LIGHT RAIN SHOWERS WILL GIVE WAY TO
NUMEROUS AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS TRACKING FROM
SOUTHWEST TO NORTHEAST TODAY. A MARGINAL RISK FOR SEVERE STRENGTH
OUTFLOW WINDS EXISTS ALONGSIDE FREQUENT LIGHTNING AND LOCALIZED HEAVY
RAINFALL. A COLD FRONT TONIGHT INTO SUNDAY BRINGS COOLER DAYTIME
TEMPERATURES BUT DEEP BOUNDARY-LAYER MIXING PRODUCING STRONG WESTERLY
WINDS AMIDST A VERY DRY AIRMASS RESULTING IN CRITICAL FIRE WEATHER
CONDITIONS. SUNDAY AFTERNOON SHOWERS AND THUNDERSTORMS (SOME OF WHICH
MAY BE STRONG TO MARGINALLY SEVERE) WILL STILL BE POSSIBLE PARTICULARLY
IN ZONE 111.
IDZ102-231030-
PALOUSE/HELLS CANYON-
322 AM PDT SAT AUG 22 2026
...HEAT ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO 7 PM PDT THIS
EVENING...
TODAY
* SKY/WEATHER.........PARTLY CLOUDY. PATCHY SMOKE IN THE MORNING.
SLIGHT CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.....95-105 VALLEYS AND 75-80 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............SOUTH 10-15 MPH.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1100. 9 KFT AGL AFTER 1400.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH UNTIL 1100, THEN
SOUTH 10 MPH UNTIL 1600, THEN SOUTHWEST 15 MPH.
* CHANCE LIGHTNING....20 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY. CHANCE OF RAIN SHOWERS AND
SLIGHT CHANCE OF THUNDERSTORMS.
* MIN TEMPERATURE.....50-60.
* MAX HUMIDITY........55-65 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......DOWNSLOPE/DOWNVALLEY 2-5 MPH.
* RIDGE TOP............WEST 5-15 MPH.
* MIXING HEIGHT.......8 KFT AGL UNTIL 1900. BELOW 500 FT TO 1 KFT
AGL AFTER 2000.
* TRANSPORT WINDS.....SOUTHWEST 10 MPH UNTIL 2000, THEN WEST 10
MPH.
* CHANCE LIGHTNING....30 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
SUNDAY
* SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY SUNNY.
* MAX TEMPERATURE.....85-95 VALLEYS AND 65-70 RIDGES.
* MIN HUMIDITY........12-22 PERCENT VALLEYS AND 26-36 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......NORTHWEST 10-15 MPH.
* RIDGE TOP............WEST 10-15 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 0900. 9 KFT
AGL AFTER 1600.
* TRANSPORT WINDS.....WEST 10 MPH UNTIL 1500, THEN 15 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
MONDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 85-95. MIN HUMIDITIES
15-25 PERCENT. NORTHEAST WINDS 10-15 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 55-65. HIGHS 90-100. MIN HUMIDITIES
10-20 PERCENT. EAST WINDS 5-10 MPH.
WEDNESDAY
PARTLY CLOUDY. LOWS 60-70. HIGHS 85-95. EAST WINDS
5-10 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 55-65. HIGHS 80-90.
FRIDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 80-90.
IDZ103-231030-
CLEARWATER/NEZ PERCE-
322 AM PDT SAT AUG 22 2026
TODAY
* SKY/WEATHER.........PARTLY CLOUDY. SLIGHT CHANCE OF RAIN IN THE
MORNING. SLIGHT CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.....90-95 VALLEYS AND 80-85 RIDGES.
* MIN HUMIDITY........18-28 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN
THE AFTERNOON.
* RIDGE TOP............SOUTH 5-10 MPH BECOMING SOUTHWEST IN THE
AFTERNOON.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1000. 8 KFT
AGL AFTER 1300.
* TRANSPORT WINDS.....SOUTH 10 MPH.
* CHANCE LIGHTNING....20 PERCENT OVER THE PALOUSE/HELLS
CANYON...AND 25 PERCENT TOWARD THE CLEARWATER/NEZ PERCE.
* CWR (> 0.10 INCH)...0 PERCENT.
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY. CHANCE OF RAIN SHOWERS AND
SLIGHT CHANCE OF THUNDERSTORMS.
* MIN TEMPERATURE.....50-60.
* MAX HUMIDITY........62-72 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......VARIABLE LESS THAN 5 MPH IN THE EVENING
BECOMING DOWNSLOPE/DOWNVALLEY 2-5 MPH.
* RIDGE TOP............SOUTH 5-10 MPH BECOMING WEST AFTER MIDNIGHT.
* MIXING HEIGHT.......6 KFT AGL UNTIL 1900. BELOW 500 FT TO 1 KFT
AGL AFTER 2000.
* TRANSPORT WINDS.....SOUTH 10 MPH UNTIL 2000, THEN SOUTHEAST 10
MPH UNTIL 2400, THEN VARIABLE LESS THAN 10 MPH.
* CHANCE LIGHTNING....25 PERCENT OVER THE PALOUSE/HELLS
CANYON...AND 30 PERCENT TOWARD THE CLEARWATER/NEZ PERCE.
* CWR (> 0.10 INCH)...0 PERCENT.
SUNDAY
* SKY/WEATHER.........PARTLY CLOUDY.
* MAX TEMPERATURE.....80-85 VALLEYS AND 70-75 RIDGES.
* MIN HUMIDITY........17-27 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO VARIABLE LESS THAN 7 MPH.
* RIDGE TOP............WEST 10-15 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1000. 8 KFT
AGL AFTER 1400.
* TRANSPORT WINDS.....WEST 10 MPH UNTIL 1500, THEN 15 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
MONDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 80-90. MIN HUMIDITIES
10-20 PERCENT. WEST WINDS 5-10 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 55-65. HIGHS 80-90. MIN HUMIDITIES
15-25 PERCENT. SOUTHEAST WINDS 5-10 MPH.
WEDNESDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 80-90. SOUTHEAST WINDS
10-15 MPH.
THURSDAY
NOT AS WARM. MOSTLY CLEAR. LOWS 55-65. HIGHS 70-80.
FRIDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 75-85.
MTZ104-231030-
KOOTENAI-
422 AM MDT SAT AUG 22 2026
...FIRE WEATHER WATCH IN EFFECT FROM THIS AFTERNOON THROUGH SUNDAY
MORNING...
TODAY
* SKY/WEATHER.........PARTLY CLOUDY. PATCHY SMOKE IN THE MORNING.
SLIGHT CHANCE OF RAIN. SLIGHT CHANCE OF RAIN SHOWERS AND
THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.....95-100 VALLEYS AND 73-83 RIDGES.
* MIN HUMIDITY........10-20 PERCENT VALLEYS AND 27-37 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN
THE AFTERNOON.
* RIDGE TOP............WEST 5-10 MPH BECOMING SOUTHWEST IN THE
AFTERNOON.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1100. 7 KFT
AGL AFTER 1500.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH UNTIL 0800, THEN
NORTHWEST 10 MPH UNTIL 1000, THEN NORTH 10 MPH UNTIL 1200, THEN
EAST 10 MPH UNTIL 1300, THEN SOUTHWEST 10 MPH UNTIL 1600, THEN 10
MPH.
* CHANCE LIGHTNING....20 PERCENT OVER THE KOOTENAI...AND 15 PERCENT
TOWARD THE FLATHEAD/GLACIER PARK.
* CWR (> 0.10 INCH)...0 PERCENT.
TONIGHT
* SKY/WEATHER.........MOSTLY CLOUDY. PATCHY SMOKE IN THE EVENING.
CHANCE OF RAIN SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS.
* MIN TEMPERATURE.....50-60.
* MAX HUMIDITY........89-99 PERCENT VALLEYS AND 70-80 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTH 5-10 MPH.
* RIDGE TOP............SOUTH 10-15 MPH.
* MIXING HEIGHT.......6 KFT AGL UNTIL 1900. BELOW 500 FT TO 1 KFT
AGL AFTER 2000.
* TRANSPORT WINDS.....SOUTHWEST 10 MPH UNTIL 2000. 10 MPH AFTER
0300.
* CHANCE LIGHTNING....20 PERCENT.
* CWR (> 0.10 INCH)...10 PERCENT.
SUNDAY
* SKY/WEATHER.........PARTLY CLOUDY.
* MAX TEMPERATURE.....80-85 VALLEYS AND 58-68 RIDGES.
* MIN HUMIDITY........13-23 PERCENT VALLEYS AND 33-43 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 10-20 MPH.
* RIDGE TOP............SOUTHWEST 15-25 MPH.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1000. 9 KFT AGL AFTER 1300.
* TRANSPORT WINDS.....SOUTHWEST 15 MPH UNTIL 1200, THEN 20 MPH.
* CHANCE LIGHTNING....20 PERCENT OVER THE KOOTENAI...AND 15 PERCENT
TOWARD THE FLATHEAD/GLACIER PARK.
* CWR (> 0.10 INCH)...0 PERCENT.
MONDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 75-85. MIN HUMIDITIES
15-25 PERCENT. SOUTHWEST WINDS 10-20 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 55-65. HIGHS 80-90. MIN HUMIDITIES
10-20 PERCENT. DIURNAL TERRAIN WINDS TO 10 MPH.
WEDNESDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 80-90. SOUTHEAST WINDS
5-10 MPH.
THURSDAY
NOT AS WARM. PARTLY CLOUDY. LOWS 55-65. HIGHS 70-80.
FRIDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 75-85.
MTZ105-231030-
FLATHEAD/GLACIER PARK-
422 AM MDT SAT AUG 22 2026
TODAY
* SKY/WEATHER.........PARTLY CLOUDY. SLIGHT CHANCE OF RAIN. SLIGHT
CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.....85-95 VALLEYS AND 75-80 RIDGES.
* MIN HUMIDITY........21-31 PERCENT VALLEYS AND 27-37 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN
THE AFTERNOON.
* RIDGE TOP............SOUTHWEST 5-10 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1100. 7 KFT
AGL AFTER 1500.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH UNTIL 0900, THEN
SOUTHWEST 10 MPH.
* CHANCE LIGHTNING....20 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY. SLIGHT CHANCE OF RAIN SHOWERS
AND THUNDERSTORMS.
* MIN TEMPERATURE.....50-60.
* MAX HUMIDITY........97-100 PERCENT VALLEYS AND 63-73 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTH 10-15 MPH.
* RIDGE TOP............SOUTH 10-15 MPH.
* MIXING HEIGHT.......5 KFT AGL UNTIL 1900. BELOW 500 FT TO 1 KFT
AGL AFTER 2000.
* TRANSPORT WINDS.....SOUTHWEST 10 MPH UNTIL 2000, THEN SOUTH 10
MPH.
* CHANCE LIGHTNING....25 PERCENT.
* CWR (> 0.10 INCH)...10 PERCENT.
SUNDAY
* SKY/WEATHER.........PARTLY CLOUDY. SLIGHT CHANCE OF THUNDERSTORMS
IN THE AFTERNOON.
* MAX TEMPERATURE.....75-80 VALLEYS AND 60-70 RIDGES.
* MIN HUMIDITY........14-24 PERCENT VALLEYS AND 25-35 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO VARIABLE LESS THAN 7 MPH.
* RIDGE TOP............SOUTHWEST 5-15 MPH INCREASING TO WEST 15-25
MPH IN THE AFTERNOON.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1000. 9 KFT AGL AFTER 1300.
* TRANSPORT WINDS.....SOUTHWEST 15 MPH UNTIL 1300, THEN 25 MPH.
* CHANCE LIGHTNING....20 PERCENT.
* CWR (> 0.10 INCH)...10 PERCENT.
MONDAY
MOSTLY CLEAR. LOWS 45-55. HIGHS 70-80. MIN HUMIDITIES
20-30 PERCENT. SOUTHWEST WINDS 15-25 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 75-85. MIN HUMIDITIES
15-25 PERCENT. SOUTHEAST WINDS 5-10 MPH.
WEDNESDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 75-85. SOUTHEAST WINDS
5-10 MPH.
THURSDAY
COOLER. MOSTLY CLEAR. LOWS 50-60. HIGHS 65-75.
FRIDAY
MOSTLY CLEAR. LOWS 45-55. HIGHS 65-75.
MTZ106-231030-
WEST LOLO-
422 AM MDT SAT AUG 22 2026
...FIRE WEATHER WATCH IN EFFECT FROM THIS AFTERNOON THROUGH SUNDAY
MORNING...
TODAY
* SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN IN THE
MORNING, THEN SLIGHT CHANCE OF RAIN SHOWERS AND THUNDERSTORMS IN
THE AFTERNOON.
* MAX TEMPERATURE.....88-98 VALLEYS AND 78-88 RIDGES.
* MIN HUMIDITY........19-29 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN
THE AFTERNOON.
* RIDGE TOP............SOUTHWEST 5-10 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1100. 9 KFT
AGL AFTER 1400.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH UNTIL 1100, THEN
SOUTHEAST 10 MPH UNTIL 1300, THEN SOUTHWEST 10 MPH.
* CHANCE LIGHTNING....20 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY. CHANCE OF RAIN SHOWERS AND
SLIGHT CHANCE OF THUNDERSTORMS.
* MIN TEMPERATURE.....55-60.
* MAX HUMIDITY........77-87 PERCENT VALLEYS AND 63-73 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......VARIABLE LESS THAN 5 MPH IN THE EVENING
BECOMING DOWNSLOPE/DOWNVALLEY 2-5 MPH.
* RIDGE TOP............SOUTHWEST 5-15 MPH.
* MIXING HEIGHT.......6 KFT AGL UNTIL 1900. BELOW 500 FT TO 1 KFT
AGL AFTER 2000.
* TRANSPORT WINDS.....SOUTHWEST 10 MPH UNTIL 2000. 10 MPH AFTER
2400.
* CHANCE LIGHTNING....20 PERCENT OVER THE WEST LOLO...AND 25
PERCENT TOWARD THE EAST LOLO.
* CWR (> 0.10 INCH)...0 PERCENT.
SUNDAY
* SKY/WEATHER.........PARTLY CLOUDY.
* MAX TEMPERATURE.....68-78.
* MIN HUMIDITY........14-24 PERCENT VALLEYS AND 21-31 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......WEST 5-15 MPH.
* RIDGE TOP............WEST 10-20 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1000. 9 KFT
AGL AFTER 1300.
* TRANSPORT WINDS.....WEST 15 MPH UNTIL 1400, THEN SOUTHWEST 20
MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
MONDAY
CLEAR. LOWS 50-60. HIGHS 80-90. MIN HUMIDITIES 10-20 PERCENT.
SOUTHWEST WINDS 10-15 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 55-65. HIGHS 80-90. MIN HUMIDITIES
15-25 PERCENT. DIURNAL TERRAIN WINDS TO 10 MPH.
WEDNESDAY
PARTLY CLOUDY. LOWS 60-70. HIGHS 80-90. SOUTH WINDS
5-10 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 55-65. HIGHS 75-85.
FRIDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 75-85.
MTZ108-231030-
EAST LOLO-
422 AM MDT SAT AUG 22 2026
TODAY
* SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN IN THE
MORNING. SLIGHT CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.....90-95 VALLEYS AND 75-85 RIDGES.
* MIN HUMIDITY........14-24 PERCENT VALLEYS AND 24-34 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN
THE AFTERNOON.
* RIDGE TOP............SOUTHWEST 5-10 MPH.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1100. 8 KFT AGL AFTER 1500.
* TRANSPORT WINDS.....SOUTH 10 MPH UNTIL 1300, THEN WEST 10 MPH.
* CHANCE LIGHTNING....20 PERCENT OVER THE WEST LOLO...AND 25
PERCENT TOWARD THE EAST LOLO.
* CWR (> 0.10 INCH)...0 PERCENT.
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY. CHANCE OF RAIN SHOWERS AND
SLIGHT CHANCE OF THUNDERSTORMS.
* MIN TEMPERATURE.....50-55.
* MAX HUMIDITY........96-100 PERCENT VALLEYS AND 72-82 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......VARIABLE LESS THAN 5 MPH IN THE EVENING
BECOMING DOWNSLOPE/DOWNVALLEY 2-5 MPH.
* RIDGE TOP............SOUTH 5-10 MPH.
* MIXING HEIGHT.......5 KFT AGL UNTIL 1900. BELOW 500 FT TO 1 KFT
AGL AFTER 2000.
* TRANSPORT WINDS.....SOUTHWEST 10 MPH UNTIL 2200, THEN SOUTH 10
MPH UNTIL 0400, THEN VARIABLE LESS THAN 10 MPH.
* CHANCE LIGHTNING....25 PERCENT OVER THE WEST LOLO...AND 30
PERCENT TOWARD THE EAST LOLO.
* CWR (> 0.10 INCH)...20 PERCENT.
SUNDAY
* SKY/WEATHER.........PARTLY CLOUDY.
* MAX TEMPERATURE.....80-85 VALLEYS AND 70-80 RIDGES.
* MIN HUMIDITY........11-21 PERCENT VALLEYS AND 18-28 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO BECOMING WEST 5-15 MPH IN THE
AFTERNOON.
* RIDGE TOP............SOUTHWEST 5-10 MPH BECOMING WEST 10-20 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1000. 10 KFT
AGL AFTER 1300.
* TRANSPORT WINDS.....WEST 10 MPH UNTIL 1200, THEN 20 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
MONDAY
CLEAR. LOWS 45-55. HIGHS 75-85. MIN HUMIDITIES 10-20 PERCENT.
WEST WINDS 10-20 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 80-90. MIN HUMIDITIES
10-20 PERCENT. DIURNAL TERRAIN WINDS TO 10 MPH.
WEDNESDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 80-90. SOUTHEAST WINDS
5-10 MPH.
THURSDAY
PARTLY CLOUDY. LOWS 50-60. HIGHS 75-85.
FRIDAY
MOSTLY CLEAR. LOWS 45-55. HIGHS 75-85.
MTZ107-231030-
FLATHEAD RESERVATION-
422 AM MDT SAT AUG 22 2026
...FIRE WEATHER WATCH IN EFFECT FROM THIS AFTERNOON THROUGH SUNDAY
MORNING...
TODAY
* SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN IN THE
MORNING. SLIGHT CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.....90-95 VALLEYS AND 70-75 RIDGES.
* MIN HUMIDITY........16-26 PERCENT VALLEYS AND 26-36 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN
THE AFTERNOON.
* RIDGE TOP............SOUTHWEST 5-15 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1100. 7 KFT
AGL AFTER 1400.
* TRANSPORT WINDS.....VARIABLE LESS THAN 10 MPH UNTIL 1300, THEN
SOUTH 10 MPH UNTIL 1500, THEN WEST 10 MPH.
* CHANCE LIGHTNING....20 PERCENT OVER AREAS WEST OF HIGHWAY
93...AND 15 PERCENT TOWARD THE MISSION MTNS AND AREAS EAST OF
HIGHWAY 93.
* CWR (> 0.10 INCH)...0 PERCENT.
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY. CHANCE OF RAIN SHOWERS AND
SLIGHT CHANCE OF THUNDERSTORMS.
* MIN TEMPERATURE.....55-60.
* MAX HUMIDITY........82-92 PERCENT VALLEYS AND 69-79 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......VARIABLE LESS THAN 5 MPH IN THE EVENING
BECOMING DOWNSLOPE/DOWNVALLEY 2-5 MPH.
* RIDGE TOP............SOUTH 5-15 MPH.
* MIXING HEIGHT.......6 KFT AGL UNTIL 1900. BELOW 500 FT TO 1 KFT
AGL AFTER 2000.
* TRANSPORT WINDS.....SOUTH 10 MPH.
* CHANCE LIGHTNING....20 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
SUNDAY
* SKY/WEATHER.........PARTLY CLOUDY.
* MAX TEMPERATURE.....80-85 VALLEYS AND 60-65 RIDGES.
* MIN HUMIDITY........11-21 PERCENT VALLEYS AND 21-31 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO BECOMING WEST 10-15 MPH IN THE
AFTERNOON.
* RIDGE TOP............WEST 5-15 MPH INCREASING TO 15-25 MPH IN THE
AFTERNOON.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1000. 10 KFT
AGL AFTER 1300.
* TRANSPORT WINDS.....SOUTHWEST 10 MPH UNTIL 1200, THEN 20 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT OVER AREAS WEST OF HIGHWAY
93...AND 15 PERCENT TOWARD THE MISSION MTNS AND AREAS EAST OF
HIGHWAY 93.
* CWR (> 0.10 INCH)...0 PERCENT.
MONDAY
CLEAR. LOWS 50-60. HIGHS 80-90. MIN HUMIDITIES 15-25 PERCENT.
SOUTHWEST WINDS 10-20 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 55-65. HIGHS 85-95. MIN HUMIDITIES
10-20 PERCENT. NORTHEAST WINDS 5-10 MPH.
WEDNESDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 85-95. SOUTHEAST WINDS
5-10 MPH.
THURSDAY
NOT AS WARM. MOSTLY CLEAR. LOWS 55-65. HIGHS 75-85.
FRIDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 75-85.
MTZ109-231030-
BITTERROOT-
422 AM MDT SAT AUG 22 2026
TODAY
* SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF RAIN IN THE
MORNING. CHANCE OF THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.....90-95 VALLEYS AND 75-80 RIDGES.
* MIN HUMIDITY........20-30 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN
THE AFTERNOON.
* RIDGE TOP............SOUTH 5-10 MPH BECOMING SOUTHWEST IN THE
AFTERNOON.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1000, THEN 4
KFT AGL UNTIL 1200, THEN 5 KFT AGL UNTIL 1300, THEN 8 KFT AGL
UNTIL 1700, THEN 6 KFT AGL.
* TRANSPORT WINDS.....SOUTH 10 MPH UNTIL 1300, THEN SOUTHWEST 10
MPH.
* CHANCE LIGHTNING....30 PERCENT OVER THE DARBY, SULA, AND WEST
FORK DISTRICTS...AND 25 PERCENT TOWARD AREAS NORTH OF HAMILTON.
* CWR (> 0.10 INCH)...10 PERCENT.
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY. CHANCE OF RAIN SHOWERS AND
SLIGHT CHANCE OF THUNDERSTORMS.
* MIN TEMPERATURE.....50-60.
* MAX HUMIDITY........85-95 PERCENT VALLEYS AND 66-76 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHEAST 5-10 MPH.
* RIDGE TOP............SOUTH 5-10 MPH.
* MIXING HEIGHT.......4 KFT AGL UNTIL 1900, THEN BELOW 500 FT TO 1
KFT AGL.
* TRANSPORT WINDS.....SOUTH 10 MPH.
* CHANCE LIGHTNING....25 PERCENT.
* CWR (> 0.10 INCH)...10 PERCENT.
SUNDAY
* SKY/WEATHER.........PARTLY CLOUDY.
* MAX TEMPERATURE.....85-90 VALLEYS AND 70-75 RIDGES.
* MIN HUMIDITY........13-23 PERCENT VALLEYS AND 20-30 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO BECOMING WEST 5-15 MPH IN THE
AFTERNOON.
* RIDGE TOP............SOUTHWEST 5-10 MPH BECOMING WEST 10-20 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1000. 10 KFT
AGL AFTER 1300.
* TRANSPORT WINDS.....SOUTHWEST 10 MPH UNTIL 1200, THEN 20 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT.
MONDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 75-85. MIN HUMIDITIES
10-20 PERCENT. WEST WINDS 10-15 MPH.
TUESDAY
PARTLY CLOUDY. LOWS 55-65. HIGHS 80-90. MIN HUMIDITIES
15-25 PERCENT. SOUTHWEST WINDS 5-10 MPH.
WEDNESDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF RAIN SHOWERS AND
THUNDERSTORMS. CHANCE OF PRECIPITATION 20 PERCENT. LOWS 55-65. HIGHS
80-90. SOUTH WINDS 5-10 MPH.
THURSDAY
PARTLY CLOUDY. LOWS 50-60. HIGHS 75-85.
FRIDAY
MOSTLY CLEAR. LOWS 50-60. HIGHS 75-85.
MTZ110-111-231030-
DEERLODGE/WEST BEAVERHEAD-EAST BEAVERHEAD-
422 AM MDT SAT AUG 22 2026
...FIRE WEATHER WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY
EVENING...
TODAY
* SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF DRY
THUNDERSTORMS IN THE MORNING. CHANCE OF RAIN SHOWERS. CHANCE OF
THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.....85-90 VALLEYS AND 70-80 RIDGES.
* MIN HUMIDITY........20-30 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 5-15 MPH.
* RIDGE TOP............SOUTHWEST 5-15 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1000, THEN 4
KFT AGL UNTIL 1200, THEN 7 KFT AGL UNTIL 1400, THEN 8 KFT AGL
UNTIL 1700, THEN 6 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 15 MPH.
* CHANCE LIGHTNING....40 PERCENT OVER THE DEERLODGE/WEST
BEAVERHEAD...AND 50 PERCENT TOWARD THE EAST BEAVERHEAD.
* CWR (> 0.10 INCH)...10 PERCENT.
TONIGHT
* SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS AND
THUNDERSTORMS.
* MIN TEMPERATURE.....40-50 VALLEYS AND 50-55 RIDGES.
* MAX HUMIDITY........92-100 PERCENT VALLEYS AND 68-78 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 5-10 MPH.
* RIDGE TOP............SOUTH 5-15 MPH.
* MIXING HEIGHT.......4 KFT AGL UNTIL 1900. BELOW 500 FT TO 1 KFT
AGL AFTER 2300.
* TRANSPORT WINDS.....SOUTHWEST 10 MPH UNTIL 2200, THEN SOUTH 10
MPH.
* CHANCE LIGHTNING....50 PERCENT.
* CWR (> 0.10 INCH)...10 PERCENT.
SUNDAY
* SKY/WEATHER.........PARTLY CLOUDY. CHANCE OF DRY THUNDERSTORMS IN
THE AFTERNOON.
* MAX TEMPERATURE.....80-90 VALLEYS AND 70-75 RIDGES.
* MIN HUMIDITY........11-21 PERCENT VALLEYS AND 17-27 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 10-15 MPH INCREASING TO 15-25 MPH
IN THE AFTERNOON.
* RIDGE TOP............SOUTHWEST 5-15 MPH INCREASING TO 15-25 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1000. 12 KFT AGL AFTER
1400.
* TRANSPORT WINDS.....SOUTHWEST 15 MPH UNTIL 1200, THEN 25 MPH.
* CHANCE LIGHTNING....20 PERCENT OVER THE DEERLODGE/WEST
BEAVERHEAD...AND 40 PERCENT TOWARD THE EAST BEAVERHEAD.
* CWR (> 0.10 INCH)...10 PERCENT.
MONDAY
MOSTLY CLEAR. LOWS 45-55. HIGHS 75-85. MIN HUMIDITIES
10-20 PERCENT. WEST WINDS 10-20 MPH.
TUESDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF RAIN SHOWERS. CHANCE OF
SHOWERS 20 PERCENT. LOWS 50-60. HIGHS 75-85. MIN HUMIDITIES
20-30 PERCENT. WEST WINDS 5-10 MPH.
WEDNESDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF RAIN SHOWERS AND
THUNDERSTORMS. CHANCE OF PRECIPITATION 20 PERCENT. LOWS 50-60. HIGHS
75-85. SOUTH WINDS 10-15 MPH.
THURSDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF RAIN SHOWERS. CHANCE OF
SHOWERS 20 PERCENT. LOWS 50-60. HIGHS 75-85.
FRIDAY
PARTLY CLOUDY. LOWS 45-55. HIGHS 75-85.
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