997
FNUS55 KMSO 161031
FWFMSO
FIRE WEATHER PLANNING FORECAST FOR WRN MONTANA AND N CNTRL IDAHO
NATIONAL WEATHER SERVICE MISSOULA MT
331 AM MST TUE DEC 16 2025
DISCUSSION
IDAHO (ZONES 102 AND 103): ATMOSPHERIC RIVER IMPACTS: AN
ATMOSPHERIC RIVER WILL BRING WIDESPREAD RAIN AND HIGH-ELEVATION
SNOW THROUGH TODAY. TAKING A QUICK LOOK AT THE NEXT 36 HOURS...
TODAY'S WEATHER, MOSTLY CLOUDY WITH AREAS OF RAIN. AREAS OF SNOW IN
THE DAY, THEN SLIGHT CHANCE OF SNOW IN THE AFTERNOON. SNOW MAY BE
HEAVY AT TIMES IN THE AFTERNOON. TONIGHT'S WEATHER, SLIGHT CHANCE
OF RAIN UNTIL MIDNIGHT, THEN RAIN LIKELY AFTER MIDNIGHT. WEDNESDAY,
RAIN SHOWERS, SNOW LIKELY AND A SLIGHT CHANCE OF THUNDERSTORMS IN THE
DAY, THEN SNOW LIKELY IN THE AFTERNOON. BLOWING SNOW IN THE DAY.
PATCHY BLOWING SNOW IN THE AFTERNOON. SOME THUNDERSTORMS MAY PRODUCE
HEAVY RAINFALL. SNOW MAY BE HEAVY AT TIMES IN THE DAY. VISIBILITY ONE
QUARTER MILE OR LESS AT TIMES. SNOW LEVEL 3500 FEET.
NORTHWEST MT (ZONES 104 AND 105): ATMOSPHERIC RIVER IMPACTS: AN
ATMOSPHERIC RIVER WILL BRING WIDESPREAD RAIN AND HIGH-ELEVATION
SNOW THROUGH TODAY. TAKING A QUICK LOOK AT THE NEXT 36 HOURS...
TODAY'S WEATHER, AREAS OF RAIN AND A SLIGHT CHANCE OF SNOW IN THE
DAY, THEN RAIN AND SNOW LIKELY IN THE AFTERNOON. PATCHY BLOWING SNOW
THROUGH THE DAY. IT'LL BE COOLER. SNOW MAY BE HEAVY AT TIMES IN THE
AFTERNOON. VISIBILITY ONE QUARTER MILE OR LESS AT TIMES. SNOW LEVEL
4000 FEET. TONIGHT'S WEATHER, RAIN AND SNOW LIKELY. PATCHY BLOWING
SNOW UNTIL MIDNIGHT. BLOWING SNOW AFTER MIDNIGHT. SNOW MAY BE HEAVY
AT TIMES. VISIBILITY ONE QUARTER MILE OR LESS AT TIMES. WEDNESDAY,
RAIN AND SNOW LIKELY IN THE DAY, THEN A CHANCE OF SNOW IN THE
AFTERNOON. BLOWING SNOW IN THE DAY, THEN PATCHY BLOWING SNOW IN THE
AFTERNOON. VISIBILITY ONE QUARTER MILE OR LESS AT TIMES. SNOW MAY BE
HEAVY AT TIMES IN THE DAY. SNOW LEVEL 3500 FEET.
WEST CENTRAL MT (ZONES 106, 107 AND 108): ATMOSPHERIC RIVER
IMPACTS: AN ATMOSPHERIC RIVER WILL BRING WIDESPREAD RAIN AND
HIGH-ELEVATION SNOW THROUGH TODAY. TAKING A QUICK LOOK AT THE NEXT
36 HOURS... TODAY'S WEATHER, MOSTLY CLOUDY WITH A 50 PERCENT CHANCE
OF AREAS OF RAIN AND SNOW. PATCHY BLOWING SNOW THROUGH THE DAY. IT'LL
BE COOLER. VISIBILITY ONE QUARTER MILE OR LESS AT TIMES. TONIGHT'S
WEATHER, A CHANCE OF RAIN AND A SLIGHT CHANCE OF SNOW UNTIL MIDNIGHT,
THEN RAIN LIKELY AND A SLIGHT CHANCE OF SNOW AFTER MIDNIGHT. PATCHY
BLOWING SNOW UNTIL MIDNIGHT. BLOWING SNOW AFTER MIDNIGHT. SNOW MAY BE
HEAVY AT TIMES AFTER MIDNIGHT. VISIBILITY ONE QUARTER MILE OR LESS AT
TIMES. WEDNESDAY, RAIN AND SNOW LIKELY IN THE DAY, THEN SNOW LIKELY
IN THE AFTERNOON. BLOWING SNOW IN THE DAY. PATCHY BLOWING SNOW IN THE
AFTERNOON. SNOW MAY BE HEAVY AT TIMES IN THE DAY. VISIBILITY ONE
QUARTER MILE OR LESS AT TIMES. SNOW LEVEL 3500 FEET.
SOUTHWEST MT (ZONES 109, 110 AND 111): ATMOSPHERIC RIVER IMPACTS:
AN ATMOSPHERIC RIVER WILL BRING WIDESPREAD RAIN AND
HIGH-ELEVATION SNOW THROUGH TODAY. TAKING A QUICK LOOK AT THE NEXT
36 HOURS... TODAY'S WEATHER, MOSTLY CLOUDY. AREAS OF RAIN AND SNOW
IN THE DAY, THEN SLIGHT CHANCE OF SNOW IN THE AFTERNOON. PATCHY
BLOWING SNOW IN THE DAY. IT'LL BE COOLER. SNOW MAY BE HEAVY AT TIMES
IN THE AFTERNOON. VISIBILITY ONE QUARTER MILE OR LESS AT TIMES IN THE
DAY. TONIGHT'S WEATHER, PARTLY CLOUDY UNTIL MIDNIGHT, THEN MOSTLY
CLOUDY WITH A 50 PERCENT CHANCE OF RAIN AND SNOW AFTER MIDNIGHT.
PATCHY BLOWING SNOW THROUGH THE NIGHT. VISIBILITY ONE QUARTER MILE OR
LESS AT TIMES. WEDNESDAY, RAIN AND SNOW LIKELY IN THE DAY, THEN A
CHANCE OF SNOW IN THE AFTERNOON. BLOWING SNOW IN THE DAY, THEN PATCHY
BLOWING SNOW IN THE AFTERNOON. VISIBILITY ONE QUARTER MILE OR LESS AT
TIMES. SNOW MAY BE HEAVY AT TIMES IN THE DAY. TEMPERATURES STEADY OR
FALLING INTO THE MID 20S IN THE AFTERNOON.
IDZ102-103-162300-
PALOUSE/HELLS CANYON-CLEARWATER/NEZ PERCE-
231 AM PST TUE DEC 16 2025
TODAY
* SKY/WEATHER.........PARTLY CLOUDY. CHANCE OF RAIN AND SNOW. SNOW
LEVEL 6000 FEET.
* MAX TEMPERATURE.....48-58 VALLEYS AND 35-45 RIDGES.
* MIN HUMIDITY........60-70 PERCENT VALLEYS AND 71-81 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 15-25 MPH.
* RIDGE TOP............WEST 25-35 MPH BECOMING SOUTHWEST 15-25 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1300, THEN 3 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 20 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...10 PERCENT IN THE PALOUSE/HELLS CANYON...AND
40 PERCENT IN THE CLEARWATER/NEZ PERCE.
TONIGHT
* SKY/WEATHER.........MOSTLY CLOUDY. RAIN. SNOW LEVEL 7000 FEET.
* MIN TEMPERATURE.....30-40 VALLEYS AND 20-30 RIDGES.
* MAX HUMIDITY........79-89 PERCENT VALLEYS AND 85-95 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTH 10-20 MPH INCREASING TO 25-35 MPH
AFTER MIDNIGHT.
* RIDGE TOP............SOUTHWEST 20-30 MPH INCREASING TO 30-40 MPH
AFTER MIDNIGHT.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 20 MPH UNTIL 0200, THEN 25 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...90 PERCENT.
WEDNESDAY
* SKY/WEATHER.........BLOWING SNOW IN THE MORNING. PATCHY BLOWING
SNOW IN THE AFTERNOON. RAIN SHOWERS AND SLIGHT CHANCE OF
THUNDERSTORMS IN THE MORNING. SNOW. SNOW LEVEL 3500 FEET.
* MAX TEMPERATURE.....45-55 VALLEYS AND 35-40 RIDGES.
* MIN HUMIDITY........55-65 PERCENT VALLEYS AND 66-76 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......WEST 25-35 MPH DECREASING TO 15-25 MPH IN
THE AFTERNOON.
* RIDGE TOP............WEST 30-40 MPH.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 0800, THEN 4 KFT AGL UNTIL
1100, THEN 6 KFT AGL UNTIL 1600, THEN 5 KFT AGL.
* TRANSPORT WINDS.....WEST 35 MPH UNTIL 0800, THEN 40 MPH UNTIL
1600, THEN 30 MPH.
* CHANCE LIGHTNING....15 PERCENT IN THE PALOUSE/HELLS CANYON...AND
NEAR 0 PERCENT IN THE CLEARWATER/NEZ PERCE.
* CWR (> 0.10 INCH)...60 PERCENT IN THE PALOUSE/HELLS CANYON...AND
100 PERCENT IN THE CLEARWATER/NEZ PERCE.
THURSDAY
MOSTLY CLOUDY WITH SNOW LIKELY. CHANCE OF SNOW 60 PERCENT.
LOWS 30-40. HIGHS 40-50. MIN HUMIDITIES 70-80 PERCENT. SOUTHWEST WINDS
15-25 MPH.
FRIDAY
RAIN AND SNOW. PATCHY BLOWING SNOW. CHANCE OF PRECIPITATION
NEAR 100 PERCENT. LOWS 35-45. HIGHS 40-50. MIN HUMIDITIES
55-65 PERCENT. SOUTHWEST WINDS 10-20 MPH.
SATURDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW AND RAIN. CHANCE OF
PRECIPITATION 50 PERCENT. LOWS 25-35. HIGHS 35-45. SOUTHWEST WINDS
5-15 MPH.
SUNDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW AND RAIN. CHANCE OF
PRECIPITATION 40 PERCENT. LOWS 25-35. HIGHS 35-45.
MONDAY
MOSTLY CLOUDY WITH RAIN AND SNOW LIKELY. CHANCE OF
PRECIPITATION 60 PERCENT. LOWS 30-40. HIGHS 40-50.
MTZ104-105-162300-
KOOTENAI-FLATHEAD/GLACIER PARK-
331 AM MST TUE DEC 16 2025
TODAY
* SKY/WEATHER.........PARTLY CLOUDY. AND PATCHY BLOWING SNOW. SNOW
AND RAIN. SNOW LEVEL 4000 FEET.
* MAX TEMPERATURE.....40-45 VALLEYS AND 30-40 RIDGES.
* MIN HUMIDITY........70-80 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTH 5-15 MPH.
* RIDGE TOP............WEST 40-50 MPH BECOMING SOUTHWEST 25-35 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......1-2 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 25 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...80 PERCENT.
TONIGHT
* SKY/WEATHER.........PATCHY BLOWING SNOW IN THE EVENING. BLOWING
SNOW AFTER MIDNIGHT. RAIN AND SNOW. SNOW LEVEL 5500 FEET.
* MIN TEMPERATURE.....30-35 VALLEYS AND 20-30 RIDGES.
* MAX HUMIDITY........94-100 PERCENT VALLEYS AND 85-95 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 30-40 MPH.
* RIDGE TOP............SOUTHWEST 30-40 MPH INCREASING TO 40-50 MPH
AFTER MIDNIGHT.
* MIXING HEIGHT.......1-2 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 25 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...100 PERCENT.
WEDNESDAY
* SKY/WEATHER.........BLOWING SNOW IN THE MORNING. PATCHY BLOWING
SNOW IN THE AFTERNOON. RAIN IN THE MORNING. SNOW. SNOW LEVEL 3500
FEET.
* MAX TEMPERATURE.....45-50 VALLEYS AND 30-40 RIDGES.
* MIN HUMIDITY........54-64 PERCENT VALLEYS AND 67-77 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......WEST 35-45 MPH.
* RIDGE TOP............WEST 40-50 MPH.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 0800. 5 KFT AGL AFTER 1200.
* TRANSPORT WINDS.....SOUTHWEST 35 MPH UNTIL 0800, THEN WEST 50 MPH
UNTIL 1600, THEN 35 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...90 PERCENT.
THURSDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. PATCHY BLOWING SNOW.
CHANCE OF SNOW 30 PERCENT. LOWS 25-35. HIGHS 35-45. MIN HUMIDITIES
65-75 PERCENT. SOUTHWEST WINDS 30-40 MPH.
FRIDAY
SNOW. PATCHY BLOWING SNOW. CHANCE OF SNOW NEAR 100 PERCENT.
LOWS 25-35. HIGHS 30-40. MIN HUMIDITIES 65-75 PERCENT. SOUTHWEST WINDS
25-35 MPH.
SATURDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW
50 PERCENT. LOWS 20-30. HIGHS 30-40. SOUTHWEST WINDS 10-20 MPH.
SUNDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW 40 PERCENT.
LOWS 20-30. HIGHS 30-40.
MONDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW AND RAIN LIKELY. CHANCE OF
PRECIPITATION 60 PERCENT. LOWS 25-35. HIGHS 35-45.
MTZ106-108-162300-
WEST LOLO-EAST LOLO-
331 AM MST TUE DEC 16 2025
TODAY
* SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF RAIN AND SNOW.
PATCHY BLOWING SNOW IN THE AFTERNOON. SNOW LEVEL 5000 FEET.
* MAX TEMPERATURE.....40-50 VALLEYS AND 35-40 RIDGES.
* MIN HUMIDITY........65-75 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 10-20 MPH.
* RIDGE TOP............WEST 35-45 MPH BECOMING SOUTHWEST 25-35 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1200, THEN 3 KFT AGL.
* TRANSPORT WINDS.....WEST 25 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...50 PERCENT IN THE WEST LOLO...AND 20 PERCENT
IN THE EAST LOLO.
TONIGHT
* SKY/WEATHER.........MOSTLY CLOUDY. AND PATCHY BLOWING SNOW. RAIN
AND SLIGHT CHANCE OF SNOW. SNOW LEVEL 6000 FEET.
* MIN TEMPERATURE.....30-35 VALLEYS AND 20-30 RIDGES.
* MAX HUMIDITY........91-100 PERCENT VALLEYS AND 82-92 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 10-15 MPH BECOMING SOUTH 15-25 MPH
AFTER MIDNIGHT.
* RIDGE TOP............SOUTHWEST 25-35 MPH INCREASING TO 35-45 MPH
AFTER MIDNIGHT.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 20 MPH UNTIL 0200, THEN 25 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...100 PERCENT IN THE WEST LOLO...AND 70 PERCENT
IN THE EAST LOLO.
WEDNESDAY
* SKY/WEATHER.........BLOWING SNOW IN THE MORNING. PATCHY BLOWING
SNOW IN THE AFTERNOON. RAIN IN THE MORNING. SNOW. SNOW LEVEL 3500
FEET.
* MAX TEMPERATURE.....35-45.
* MIN HUMIDITY........57-67 PERCENT VALLEYS AND 65-75 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......WEST 30-40 MPH.
* RIDGE TOP............WEST 35-45 MPH.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 0800, THEN 5 KFT AGL UNTIL
1100, THEN 6 KFT AGL UNTIL 1600, THEN 5 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 35 MPH UNTIL 0800, THEN WEST 50 MPH
UNTIL 1600, THEN 40 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...90 PERCENT.
THURSDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. PATCHY BLOWING SNOW.
CHANCE OF SNOW 30 PERCENT. LOWS 25-35. HIGHS 35-45. MIN HUMIDITIES
70-80 PERCENT. SOUTHWEST WINDS 30-40 MPH.
FRIDAY
SNOW AND RAIN. PATCHY BLOWING SNOW. CHANCE OF PRECIPITATION
NEAR 100 PERCENT. LOWS 30-40. HIGHS 35-45. MIN HUMIDITIES
60-70 PERCENT. SOUTHWEST WINDS 20-30 MPH.
SATURDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW
40 PERCENT. LOWS 25-35. HIGHS 30-40. SOUTHWEST WINDS 10-20 MPH.
SUNDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW 30 PERCENT.
LOWS 20-30. HIGHS 30-40.
MONDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW AND RAIN. CHANCE OF
PRECIPITATION 50 PERCENT. LOWS 25-35. HIGHS 35-45.
MTZ107-162300-
FLATHEAD RESERVATION-
331 AM MST TUE DEC 16 2025
TODAY
* SKY/WEATHER.........MOSTLY CLOUDY. AND PATCHY BLOWING SNOW. RAIN
AND CHANCE OF SNOW. SNOW LEVEL 5000 FEET.
* MAX TEMPERATURE.....50-55 VALLEYS AND 30-35 RIDGES.
* MIN HUMIDITY........60-70 PERCENT VALLEYS AND 68-78 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 10-20 MPH.
* RIDGE TOP............WEST 35-45 MPH BECOMING SOUTHWEST 25-35 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1100, THEN 3 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 20 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...20 PERCENT IN AREAS WEST OF HIGHWAY 93...AND
40 PERCENT IN THE MISSION MTNS AND AREAS EAST OF HIGHWAY 93.
TONIGHT
* SKY/WEATHER.........PATCHY BLOWING SNOW IN THE EVENING. CHANCE OF
SNOW IN THE EVENING. RAIN. SNOW LEVEL 6000 FEET.
* MIN TEMPERATURE.....35-40 VALLEYS AND 20-25 RIDGES.
* MAX HUMIDITY........83-93 PERCENT VALLEYS AND 94 PERCENT RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTH 25-35 MPH.
* RIDGE TOP............SOUTH 35-45 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 20 MPH UNTIL 0200, THEN 25 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...90 PERCENT.
WEDNESDAY
* SKY/WEATHER.........BLOWING SNOW IN THE MORNING. PATCHY BLOWING
SNOW IN THE AFTERNOON. RAIN IN THE MORNING. SNOW LIKELY. SNOW
LEVEL 3500 FEET.
* MAX TEMPERATURE.....45-50 VALLEYS AND 30-35 RIDGES.
* MIN HUMIDITY........51-61 PERCENT VALLEYS AND 67-77 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......WEST 30-40 MPH.
* RIDGE TOP............WEST 40-50 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 0700. 6 KFT
AGL AFTER 1300.
* TRANSPORT WINDS.....SOUTHWEST 30 MPH UNTIL 0800, THEN WEST 45 MPH
UNTIL 1000, THEN 50 MPH UNTIL 1600, THEN 35 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...80 PERCENT IN AREAS WEST OF HIGHWAY 93...AND
100 PERCENT IN THE MISSION MTNS AND AREAS EAST OF HIGHWAY 93.
THURSDAY
MOSTLY CLOUDY WITH SNOW. PATCHY BLOWING SNOW. CHANCE OF
SNOW 80 PERCENT. LOWS 30-40. HIGHS 40-50. MIN HUMIDITIES 65-75 PERCENT.
SOUTHWEST WINDS 25-35 MPH.
FRIDAY
CLOUDY WITH SNOW AND RAIN. PATCHY BLOWING SNOW. CHANCE OF
PRECIPITATION 90 PERCENT. LOWS 30-40. HIGHS 40-50. MIN HUMIDITIES
60-70 PERCENT. SOUTHWEST WINDS 15-25 MPH.
SATURDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW
40 PERCENT. LOWS 25-35. HIGHS 35-45. SOUTHWEST WINDS 10-20 MPH.
SUNDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW 30 PERCENT.
LOWS 25-35. HIGHS 35-45.
MONDAY
MOSTLY CLOUDY WITH CHANCE OF RAIN AND SNOW. CHANCE OF
PRECIPITATION 50 PERCENT. LOWS 25-35. HIGHS 40-50.
MTZ109-162300-
BITTERROOT-
331 AM MST TUE DEC 16 2025
TODAY
* SKY/WEATHER.........PARTLY CLOUDY. PATCHY BLOWING SNOW IN THE
MORNING. PATCHY BLOWING SNOW IN THE AFTERNOON. CHANCE OF RAIN AND
SNOW. SNOW LEVEL 6500 FEET.
* MAX TEMPERATURE.....50-55 VALLEYS AND 35-40 RIDGES.
* MIN HUMIDITY........57-67 PERCENT VALLEYS AND 65-75 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 10-20 MPH.
* RIDGE TOP............WEST 35-45 MPH BECOMING SOUTHWEST 25-35 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1200, THEN 3 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 25 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...20 PERCENT.
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING CLOUDY. AND
PATCHY BLOWING SNOW. SNOW AFTER MIDNIGHT. SNOW LEVEL 6500 FEET.
* MIN TEMPERATURE.....30-35 VALLEYS AND 20-25 RIDGES.
* MAX HUMIDITY........76-86 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTH 30-40 MPH.
* RIDGE TOP............SOUTH 35-45 MPH.
* MIXING HEIGHT.......1-2 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 25 MPH UNTIL 0200, THEN 30 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)...70 PERCENT.
WEDNESDAY
* SKY/WEATHER.........BLOWING SNOW IN THE MORNING. PATCHY BLOWING
SNOW IN THE AFTERNOON. RAIN IN THE MORNING. SNOW. SNOW LEVEL 4000
FEET.
* MAX TEMPERATURE.....45-50 VALLEYS AND 35-40 RIDGES.
* MIN HUMIDITY........49-59 PERCENT VALLEYS AND 60-70 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......WEST 30-40 MPH.
* RIDGE TOP............WEST 35-45 MPH.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 0800, THEN 4 KFT AGL UNTIL
1000, THEN 6 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 35 MPH UNTIL 1000, THEN WEST 45 MPH
UNTIL 1600, THEN 35 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...100 PERCENT.
THURSDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW
30 PERCENT. LOWS 20-30. HIGHS 35-45. MIN HUMIDITIES 70-80 PERCENT.
SOUTHWEST WINDS 25-35 MPH.
FRIDAY
SNOW AND RAIN. PATCHY BLOWING SNOW. CHANCE OF PRECIPITATION
NEAR 100 PERCENT. LOWS 30-40. HIGHS 35-45. MIN HUMIDITIES
50-60 PERCENT. SOUTHWEST WINDS 20-30 MPH.
SATURDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW
40 PERCENT. LOWS 20-30. HIGHS 30-40. SOUTHWEST WINDS 15-25 MPH.
SUNDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW 30 PERCENT.
LOWS 20-30. HIGHS 35-45.
MONDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW AND RAIN. CHANCE OF
PRECIPITATION 50 PERCENT. LOWS 25-35. HIGHS 35-45.
MTZ110-111-162300-
DEERLODGE/WEST BEAVERHEAD-EAST BEAVERHEAD-
331 AM MST TUE DEC 16 2025
TODAY
* SKY/WEATHER.........PARTLY CLOUDY. PATCHY BLOWING SNOW IN THE
MORNING. CHANCE OF RAIN AND SNOW. SNOW LEVEL 6500 FEET.
* MAX TEMPERATURE.....45-55 VALLEYS AND 35-40 RIDGES.
* MIN HUMIDITY........47-57 PERCENT VALLEYS AND 55-65 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 20-30 MPH.
* RIDGE TOP............SOUTHWEST 30-40 MPH DECREASING TO 20-30 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1100, THEN 4
KFT AGL UNTIL 1600, THEN 3 KFT AGL.
* TRANSPORT WINDS.....WEST 25 MPH UNTIL 1300, THEN SOUTHWEST 30
MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...10 PERCENT.
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY. AND PATCHY BLOWING SNOW.
CHANCE OF SNOW AFTER MIDNIGHT. SNOW LEVEL 6500 FEET.
* MIN TEMPERATURE.....28-38 VALLEYS AND 20-30 RIDGES.
* MAX HUMIDITY........69-79 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 15-25 MPH INCREASING TO 25-35 MPH
AFTER MIDNIGHT.
* RIDGE TOP............SOUTHWEST 30-40 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 25 MPH UNTIL 0400, THEN 30 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT IN THE DEERLODGE/WEST
BEAVERHEAD...AND 0 PERCENT IN THE EAST BEAVERHEAD.
* CWR (> 0.10 INCH)...30 PERCENT IN THE DEERLODGE/WEST
BEAVERHEAD...AND 10 PERCENT IN THE EAST BEAVERHEAD.
WEDNESDAY
* SKY/WEATHER.........PATCHY BLOWING SNOW. RAIN IN THE MORNING.
SNOW. SNOW LEVEL 5000 FEET.
* MAX TEMPERATURE.....45-50 VALLEYS AND 30-40 RIDGES.
* MIN HUMIDITY........40-50 PERCENT VALLEYS AND 47-57 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......WEST 40-50 MPH.
* RIDGE TOP............WEST 40-50 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 0900, THEN 4
KFT AGL UNTIL 1100, THEN 6 KFT AGL UNTIL 1600, THEN 5 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 35 MPH UNTIL 1000, THEN WEST 50 MPH
UNTIL 1600, THEN 40 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...90 PERCENT IN THE DEERLODGE/WEST
BEAVERHEAD...AND 70 PERCENT IN THE EAST BEAVERHEAD.
THURSDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. PATCHY BLOWING SNOW.
CHANCE OF SNOW 30 PERCENT. LOWS 20-30. HIGHS 35-45. MIN HUMIDITIES
50-60 PERCENT. SOUTHWEST WINDS 25-35 MPH.
FRIDAY
MOSTLY CLOUDY WITH SNOW AND RAIN LIKELY. CHANCE OF
PRECIPITATION 60 PERCENT. LOWS 30-40. HIGHS 40-50. MIN HUMIDITIES
45-55 PERCENT. SOUTHWEST WINDS 20-30 MPH.
SATURDAY
COLDER. MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW
30 PERCENT. LOWS 20-30. HIGHS 30-40. SOUTHWEST WINDS 10-20 MPH.
SUNDAY
PARTLY CLOUDY WITH SLIGHT CHANCE OF SNOW. CHANCE OF SNOW
20 PERCENT. LOWS 20-30. HIGHS 35-45.
MONDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW AND RAIN. CHANCE OF
PRECIPITATION 30 PERCENT. LOWS 25-35. HIGHS 40-50.
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