353  
FPUS65 KTFX 182138  
AFPTFX  
 
CENTRAL AND SOUTHWEST MONTANA AREA FORECAST  
NATIONAL WEATHER SERVICE GREAT FALLS MT  
337 PM MDT FRI SEP 18 2026  
 
MTZ301>314-316>318-191200-  
CENTRAL MONTANA-  
NATIONAL WEATHER SERVICE GREAT FALLS MT  
337 PM MDT FRI SEP 18 2026  
 
...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY EVENING FOR  
LITTLE BELT AND HIGHWOOD MOUNTAINS...  
   
TONIGHT  
MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS AND SLIGHT  
CHANCE OF THUNDERSTORMS IN THE EVENING. CHANCE OF RAIN AFTER  
MIDNIGHT. SOME THUNDERSTORMS MAY PRODUCE HEAVY RAINFALL IN THE  
EVENING. LOWS 50 TO 55...45 TO 50 IN THE MOUNTAINS.    
SATURDAY  
CLOUDY. CHANCE OF RAIN THROUGH THE DAY. HIGHS 60 TO  
70...50 TO 60 IN THE MOUNTAINS.    
SATURDAY NIGHT  
MOSTLY CLOUDY. CHANCE OF RAIN THROUGH THE  
NIGHT. LOWS 45 TO 50...40 TO 45 IN THE MOUNTAINS.    
SUNDAY  
MOSTLY CLEAR. HIGHS 65 TO 75.    
MONDAY  
MOSTLY CLEAR. LOWS 45 TO 50. HIGHS 70 TO 80.    
TUESDAY  
MOSTLY CLEAR. LOWS 45 TO 50. HIGHS 70 TO 80.    
WEDNESDAY  
MOSTLY CLEAR. LOWS 45 TO 55. HIGHS 70 TO 80.  
 
 
 
MTZ315-319>330-191200-  
SOUTHWEST MONTANA-  
NATIONAL WEATHER SERVICE GREAT FALLS MT  
337 PM MDT FRI SEP 18 2026  
 
...FLOOD WATCH IN EFFECT THROUGH SATURDAY AFTERNOON FOR HELENA  
VALLEY...MEAGHER COUNTY VALLEYS...CANYON FERRY AREA...GALLATIN  
VALLEY...  
...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY EVENING FOR BIG  
BELT, BRIDGER AND CASTLE MOUNTAINS...ELKHORN AND BOULDER  
MOUNTAINS...  
...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY AFTERNOON FOR  
NORTHWEST BEAVERHEAD COUNTY...  
   
TONIGHT  
CHANCE OF THUNDERSTORMS IN THE EVENING. RAIN SHOWERS  
THROUGH THE NIGHT. SLIGHT CHANCE OF THUNDERSTORMS AFTER MIDNIGHT.  
SOME THUNDERSTORMS MAY PRODUCE HEAVY RAINFALL IN THE EVENING.  
SOME THUNDERSTORMS MAY PRODUCE HEAVY RAINFALL AFTER MIDNIGHT.  
LOWS 40 TO 50.    
SATURDAY  
CLOUDY. RAIN SHOWERS AND SLIGHT CHANCE OF  
THUNDERSTORMS. SOME THUNDERSTORMS MAY PRODUCE HEAVY RAINFALL.  
HIGHS 55 TO 60...45 TO 55 IN THE MOUNTAINS.    
SATURDAY NIGHT  
MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS AND  
SLIGHT CHANCE OF THUNDERSTORMS THROUGH THE NIGHT. SLIGHT CHANCE  
OF RAIN AFTER MIDNIGHT. PATCHY FOG AFTER MIDNIGHT. SOME  
THUNDERSTORMS MAY PRODUCE HEAVY RAINFALL. LOWS 40 TO 50...35 TO  
45 IN THE MOUNTAINS.    
SUNDAY  
PARTLY CLOUDY. HIGHS 60 TO 70.    
MONDAY  
MOSTLY CLEAR. LOWS 40 TO 45. HIGHS 65 TO 75.    
TUESDAY  
PARTLY CLOUDY. LOWS 40 TO 50. HIGHS 65 TO 75.    
WEDNESDAY  
MOSTLY CLEAR. LOWS 40 TO 50. HIGHS 65 TO 75.  
 
 
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