525  
FNUS55 KMSO 211018  
FWFMSO  
 
FIRE WEATHER PLANNING FORECAST FOR WRN MONTANA AND N CNTRL IDAHO  
NATIONAL WEATHER SERVICE MISSOULA MT  
418 AM MDT MON AUG 21 2017  
 
   
DISCUSSION
 
 
IDAHO: TODAY WILL BE SLIGHTLY WARMER AND SLIGHTLY DRIER THAN YESTERDAY,  
AND THIS WILL BE THE STEADY PROGRESSION OVER THE NEXT FEW DAYS AS HIGH  
PRESSURE RESTRENGTHENS OVER NORTH CENTRAL IDAHO. THIS HIGH PRESSURE WILL  
BREAKDOWN LATE WEDNESDAY NIGHT THROUGH THURSDAY, AND THIS WILL MOST  
DEFINITELY BE THE MOST CRITICAL PERIOD FOR FIRES LOOKING AHEAD THIS  
WEEK. OUR EARLY CONCERNS ARE THE POTENTIAL FOR MOSTLY-DRY  
THUNDERSTORMS, AS WELL AS A FRONTAL PASSAGE THAT COULD INCREASE WINDS  
EVEN STRONGER THAN PREVIOUS FRONTAL PASSAGES THUS FAR. MORE DETAILS TO  
EMERGE IN THE COMING DAYS.  
 
MONTANA: TODAY WILL BE SLIGHTLY WARMER AND SLIGHTLY DRIER THAN YESTERDAY,  
AND THIS WILL BE THE STEADY PROGRESSION OVER THE NEXT FEW DAYS AS HIGH  
PRESSURE RESTRENGTHENS OVER NORTH CENTRAL IDAHO. THIS HIGH PRESSURE WILL  
BREAKDOWN LATE WEDNESDAY NIGHT THROUGH THURSDAY, AND THIS WILL MOST  
DEFINITELY BE THE MOST CRITICAL PERIOD FOR FIRES LOOKING AHEAD THIS  
WEEK. OUR EARLY CONCERNS ARE THE POTENTIAL FOR MOSTLY-DRY  
THUNDERSTORMS, AS WELL AS A FRONTAL PASSAGE THAT COULD INCREASE WINDS  
EVEN STRONGER THAN PREVIOUS FRONTAL PASSAGES THUS FAR. MORE DETAILS TO  
EMERGE IN THE COMING DAYS.  
 
FOLLOW US ON TWITTER AT HTTPS://TWITTER.COM/NWSMISSOULA  
 
IDZ102-103-221030-  
PALOUSE/HELLS CANYON-CLEARWATER/NEZ PERCE-  
318 AM PDT MON AUG 21 2017  
   
TODAY
 
 
* SKY/WEATHER.........MOSTLY SUNNY. HAZE AND AREAS OF SMOKE.  
* MAX TEMPERATURE.....85-95 VALLEYS AND 75-80 RIDGES.  
* MIN HUMIDITY........10-20 PERCENT VALLEYS AND 17-27 PERCENT  
RIDGES.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN THE  
AFTERNOON.  
* RIDGE TOP............EAST UP TO 5 MPH BECOMING NORTHWEST LATE IN  
THE AFTERNOON.  
* HAINES INDEX........3 VERY LOW.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
TONIGHT
 
 
* SKY/WEATHER.........MOSTLY CLEAR. HAZE AND AREAS OF SMOKE.  
* MIN TEMPERATURE.....48-58.  
* MAX HUMIDITY........62-72 PERCENT VALLEYS AND 52-62 PERCENT  
RIDGES.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......DOWNSLOPE/DOWNVALLEY 2-5 MPH.  
* RIDGE TOP............NORTHEAST 5-10 MPH BECOMING SOUTHEAST UP TO  
5 MPH AFTER MIDNIGHT.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
TUESDAY
 
 
* SKY/WEATHER.........MOSTLY SUNNY. HAZE AND AREAS OF SMOKE.  
* MAX TEMPERATURE.....90-100 VALLEYS AND 80-85 RIDGES.  
* MIN HUMIDITY........10-20 PERCENT.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN THE  
AFTERNOON.  
* RIDGE TOP............SOUTH UP TO 5 MPH BECOMING WEST 5-10 MPH IN  
THE AFTERNOON.  
* HAINES INDEX........3 VERY LOW.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
WEDNESDAY
 
MOSTLY CLEAR. SLIGHT CHANCE OF RAIN SHOWERS AND  
THUNDERSTORMS. HAZE AND AREAS OF SMOKE. LOWS 55-65. HIGHS 85-95. WEST  
WINDS 5-10 MPH.    
THURSDAY
 
NOT AS WARM. MOSTLY CLOUDY WITH CHANCE OF RAIN SHOWERS AND  
SLIGHT CHANCE OF THUNDERSTORMS. LOWS 55-65. HIGHS 75-85. WEST WINDS  
10-15 MPH.    
FRIDAY
 
MOSTLY CLEAR. LOWS 45-55. HIGHS 75-85. WEST WINDS 10-20 MPH.    
SATURDAY
 
CLEAR. AREAS OF SMOKE. LOWS 45-55. HIGHS 80-90.    
SUNDAY
 
CLEAR. AREAS OF SMOKE. LOWS 50-60. HIGHS 85-95.  
 

 
 
MTZ104-105-221030-  
KOOTENAI-FLATHEAD/GLACIER PARK-  
418 AM MDT MON AUG 21 2017  
   
TODAY
 
 
* SKY/WEATHER.........MOSTLY SUNNY. HAZE AND AREAS OF SMOKE.  
* MAX TEMPERATURE.....80-90 VALLEYS AND 65-75 RIDGES.  
* MIN HUMIDITY........15-25 PERCENT VALLEYS AND 23-33 PERCENT  
RIDGES.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN THE  
AFTERNOON.  
* RIDGE TOP............WEST 5-10 MPH.  
* HAINES INDEX........2 VERY LOW.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
TONIGHT
 
 
* SKY/WEATHER.........PARTLY CLOUDY. HAZE AND AREAS OF SMOKE.  
* MIN TEMPERATURE.....38-48 VALLEYS AND 45-55 RIDGES.  
* MAX HUMIDITY........73-83 PERCENT VALLEYS AND 58-68 PERCENT  
RIDGES.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......DOWNSLOPE/DOWNVALLEY 2-5 MPH.  
* RIDGE TOP............WEST UP TO 5 MPH BECOMING SOUTH IN THE LATE  
EVENING AND OVERNIGHT.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
TUESDAY
 
 
* SKY/WEATHER.........MOSTLY SUNNY. HAZE AND AREAS OF SMOKE.  
* MAX TEMPERATURE.....85-95 VALLEYS AND 75-85 RIDGES.  
* MIN HUMIDITY........15-25 PERCENT.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN THE  
AFTERNOON.  
* RIDGE TOP............SOUTHWEST 5-10 MPH.  
* HAINES INDEX........2 VERY LOW.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
WEDNESDAY
 
MOSTLY CLEAR. HAZE AND AREAS OF SMOKE. LOWS 50-60. HIGHS  
80-90. SOUTHWEST WINDS 10-20 MPH.    
THURSDAY
 
NOT AS WARM. PARTLY CLOUDY WITH CHANCE OF RAIN SHOWERS AND  
SLIGHT CHANCE OF THUNDERSTORMS. LOWS 55-65. HIGHS 70-80. SOUTHWEST  
WINDS 20-30 MPH.    
FRIDAY
 
MOSTLY CLEAR. LOWS 45-55. HIGHS 70-80. SOUTHWEST WINDS  
20-30 MPH.    
SATURDAY
 
MOSTLY CLEAR. AREAS OF SMOKE. LOWS 45-55. HIGHS 75-85.    
SUNDAY
 
MOSTLY CLEAR. AREAS OF SMOKE. LOWS 45-55. HIGHS 80-90.  
 

 
 
MTZ106-108-221030-  
WEST LOLO-EAST LOLO-  
418 AM MDT MON AUG 21 2017  
   
TODAY
 
 
* SKY/WEATHER.........MOSTLY SUNNY. HAZE AND AREAS OF SMOKE.  
* MAX TEMPERATURE.....80-90 VALLEYS AND 70-80 RIDGES.  
* MIN HUMIDITY........9-19 PERCENT VALLEYS AND 15-25 PERCENT  
RIDGES.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN THE  
AFTERNOON.  
* RIDGE TOP............NORTHWEST UP TO 5 MPH.  
* HAINES INDEX........2 VERY LOW.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
TONIGHT
 
 
* SKY/WEATHER.........MOSTLY CLEAR. HAZE AND AREAS OF SMOKE.  
* MIN TEMPERATURE.....40-50 VALLEYS AND 50-60 RIDGES.  
* MAX HUMIDITY........58-68 PERCENT VALLEYS AND 34-44 PERCENT  
RIDGES.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......DOWNSLOPE/DOWNVALLEY 2-5 MPH.  
* RIDGE TOP............NORTHEAST UP TO 5 MPH BECOMING SOUTHEAST  
AFTER MIDNIGHT.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
TUESDAY
 
 
* SKY/WEATHER.........SUNNY. HAZE AND AREAS OF SMOKE.  
* MAX TEMPERATURE.....90-95 VALLEYS AND 75-85 RIDGES.  
* MIN HUMIDITY........9-19 PERCENT.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN THE  
AFTERNOON.  
* RIDGE TOP............WEST 5-10 MPH.  
* HAINES INDEX........3 VERY LOW.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
WEDNESDAY
 
MOSTLY CLEAR. HAZE AND AREAS OF SMOKE. LOWS 55-65. HIGHS  
85-95. SOUTHWEST WINDS 5-10 MPH.    
THURSDAY
 
NOT AS WARM. MOSTLY CLOUDY WITH CHANCE OF RAIN SHOWERS AND  
SLIGHT CHANCE OF THUNDERSTORMS. LOWS 55-65. HIGHS 75-85. WEST WINDS  
10-20 MPH.    
FRIDAY
 
MOSTLY CLEAR. CHANCE OF RAIN SHOWERS AND THUNDERSTORMS. LOWS  
45-55. HIGHS 75-85. WEST WINDS 15-25 MPH.    
SATURDAY
 
MOSTLY CLEAR. AREAS OF SMOKE. LOWS 45-55. HIGHS 80-90.    
SUNDAY
 
CLEAR. AREAS OF SMOKE. LOWS 50-60. HIGHS 80-90.  
 

 
 
MTZ107-221030-  
SALISH AND KOOTENAI RESERVATION-  
418 AM MDT MON AUG 21 2017  
   
TODAY
 
 
* SKY/WEATHER.........MOSTLY SUNNY. HAZE AND AREAS OF SMOKE.  
* MAX TEMPERATURE.....80-85 VALLEYS AND 65-70 RIDGES.  
* MIN HUMIDITY........15-25 PERCENT.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......VARIABLE LESS THAN 7 MPH.  
* RIDGE TOP............NORTHWEST UP TO 5 MPH EARLY IN THE MORNING  
BECOMING VARIABLE 1-3 MPH, THEN BECOMING NORTHWEST UP TO 5  
MPH IN THE AFTERNOON.  
* HAINES INDEX........2 VERY LOW.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
TONIGHT
 
 
* SKY/WEATHER.........MOSTLY CLEAR. HAZE AND AREAS OF SMOKE.  
* MIN TEMPERATURE.....45-55.  
* MAX HUMIDITY........59-69 PERCENT VALLEYS AND 44-54 PERCENT  
RIDGES.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......DOWNSLOPE/DOWNVALLEY 1-3 MPH.  
* RIDGE TOP............NORTHEAST UP TO 5 MPH BECOMING SOUTHEAST  
AFTER MIDNIGHT.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
TUESDAY
 
 
* SKY/WEATHER.........SUNNY. HAZE AND AREAS OF SMOKE.  
* MAX TEMPERATURE.....85-95 VALLEYS AND 70-75 RIDGES.  
* MIN HUMIDITY........10-20 PERCENT.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......VARIABLE LESS THAN 7 MPH.  
* RIDGE TOP............SOUTH UP TO 5 MPH BECOMING WEST IN THE  
AFTERNOON.  
* HAINES INDEX........3 VERY LOW.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
WEDNESDAY
 
MOSTLY CLEAR. HAZE AND AREAS OF SMOKE. LOWS 55-65. HIGHS  
85-95. SOUTH WINDS 10-15 MPH.    
THURSDAY
 
NOT AS WARM. MOSTLY CLOUDY WITH CHANCE OF RAIN SHOWERS AND  
THUNDERSTORMS. LOWS 60-70. HIGHS 75-85. SOUTHWEST WINDS 10-20 MPH.    
FRIDAY
 
MOSTLY CLEAR. CHANCE OF RAIN SHOWERS AND THUNDERSTORMS. LOWS  
50-60. HIGHS 75-85. SOUTHWEST WINDS 15-25 MPH.    
SATURDAY
 
MOSTLY CLEAR. AREAS OF SMOKE. LOWS 45-55. HIGHS 80-90.    
SUNDAY
 
MOSTLY CLEAR. AREAS OF SMOKE. LOWS 50-60. HIGHS 85-95.  
 

 
 
MTZ109-221030-  
BITTERROOT-  
418 AM MDT MON AUG 21 2017  
   
TODAY
 
 
* SKY/WEATHER.........MOSTLY SUNNY. HAZE AND AREAS OF SMOKE.  
* MAX TEMPERATURE.....85-90 VALLEYS AND 70-75 RIDGES.  
* MIN HUMIDITY........12-22 PERCENT.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN THE  
AFTERNOON.  
* RIDGE TOP............NORTHEAST UP TO 5 MPH BECOMING NORTHWEST IN  
THE AFTERNOON.  
* HAINES INDEX........3 VERY LOW.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
TONIGHT
 
 
* SKY/WEATHER.........MOSTLY CLEAR. HAZE AND AREAS OF SMOKE.  
* MIN TEMPERATURE.....45-55.  
* MAX HUMIDITY........62-72 PERCENT VALLEYS AND 39-49 PERCENT  
RIDGES.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......DOWNSLOPE/DOWNVALLEY 1-3 MPH.  
* RIDGE TOP............NORTHEAST UP TO 5 MPH BECOMING SOUTHEAST  
AFTER MIDNIGHT.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
TUESDAY
 
 
* SKY/WEATHER.........SUNNY. HAZE AND AREAS OF SMOKE.  
* MAX TEMPERATURE.....90-95 VALLEYS AND 75-80 RIDGES.  
* MIN HUMIDITY........9-19 PERCENT.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......BECOMING UPSLOPE/UPVALLEY 4-8 MPH IN THE  
AFTERNOON.  
* RIDGE TOP............WEST 5-10 MPH.  
* HAINES INDEX........4 LOW.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
WEDNESDAY
 
MOSTLY CLEAR. SLIGHT CHANCE OF RAIN SHOWERS AND  
THUNDERSTORMS. HAZE AND AREAS OF SMOKE. LOWS 50-60. HIGHS 80-90.  
SOUTHWEST WINDS 5-10 MPH.    
THURSDAY
 
NOT AS WARM. MOSTLY CLOUDY WITH CHANCE OF RAIN SHOWERS AND  
THUNDERSTORMS. LOWS 55-65. HIGHS 70-80. WEST WINDS 10-20 MPH.    
FRIDAY
 
PARTLY CLOUDY WITH CHANCE OF RAIN SHOWERS AND THUNDERSTORMS.  
LOWS 45-55. HIGHS 70-80. WEST WINDS 15-25 MPH.    
SATURDAY
 
MOSTLY CLEAR. AREAS OF SMOKE. LOWS 45-55. HIGHS 75-85.    
SUNDAY
 
MOSTLY CLEAR. AREAS OF SMOKE. LOWS 45-55. HIGHS 80-90.  
 

 
 
MTZ110-111-221030-  
DEERLODGE/WEST BEAVERHEAD-EAST BEAVERHEAD-  
418 AM MDT MON AUG 21 2017  
   
TODAY
 
 
* SKY/WEATHER.........MOSTLY SUNNY. AREAS OF SMOKE AND HAZE.  
* MAX TEMPERATURE.....75-80 VALLEYS AND 65-75 RIDGES.  
* MIN HUMIDITY........14-24 PERCENT.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......VARIABLE LESS THAN 7 MPH.  
* RIDGE TOP............NORTHWEST UP TO 5 MPH.  
* HAINES INDEX........4 LOW.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
TONIGHT
 
 
* SKY/WEATHER.........MOSTLY CLEAR. HAZE AND PATCHY SMOKE.  
* MIN TEMPERATURE.....40-50.  
* MAX HUMIDITY........69-79 PERCENT VALLEYS AND 55-65 PERCENT  
RIDGES.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......DOWNSLOPE/DOWNVALLEY 2-5 MPH.  
* RIDGE TOP............NORTH 5-10 MPH BECOMING NORTHEAST UP TO 5  
MPH LATE IN THE EVENING, THEN BECOMING SOUTH AFTER MIDNIGHT.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
TUESDAY
 
 
* SKY/WEATHER.........MOSTLY SUNNY. HAZE AND PATCHY SMOKE.  
* MAX TEMPERATURE.....85-90 VALLEYS AND 75-80 RIDGES.  
* MIN HUMIDITY........9-19 PERCENT.  
* 20-FOOT WINDS.......  
* LOWER ELEVATION......VARIABLE LESS THAN 7 MPH.  
* RIDGE TOP............SOUTHWEST 5-10 MPH.  
* HAINES INDEX........4 LOW.  
* LAL.................1.  
* CWR (> 0.10 INCH)...0 PERCENT.  
   
WEDNESDAY
 
MOSTLY CLEAR. HAZE AND PATCHY SMOKE. LOWS 50-60. HIGHS  
80-90. SOUTHWEST WINDS 10-15 MPH.    
THURSDAY
 
MOSTLY CLOUDY WITH CHANCE OF RAIN SHOWERS AND  
THUNDERSTORMS. LOWS 50-60. HIGHS 75-85. SOUTHWEST WINDS 10-15 MPH.    
FRIDAY
 
PARTLY CLOUDY WITH CHANCE OF RAIN SHOWERS AND THUNDERSTORMS.  
LOWS 45-55. HIGHS 70-80. SOUTHWEST WINDS 10-20 MPH.    
SATURDAY
 
MOSTLY CLEAR. AREAS OF SMOKE. LOWS 45-55. HIGHS 75-85.    
SUNDAY
 
MOSTLY CLEAR. AREAS OF SMOKE. LOWS 45-55. HIGHS 75-85.  
 

 
 
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