024
FNUS55 KMSO 172031
FWFMSO
FIRE WEATHER PLANNING FORECAST FOR WRN MONTANA AND N CNTRL IDAHO
NATIONAL WEATHER SERVICE MISSOULA MT
131 PM MST WED DEC 17 2025
DISCUSSION
IDAHO (ZONES 102 AND 103): - SNOW AND RAIN THURSDAY THROUGH
SATURDAY: FOLLOWING THE FRONT, COOLER AND UNSETTLED WEATHER WILL
PREVAIL FOR THE REMAINDER OF THE WEEK, WITH SNOW LEVELS DROPPING
TO VALLEY FLOORS AT TIMES AND PERIODS OF MOUNTAIN SNOW AFFECTING
TRAVEL. TAKING A QUICK LOOK AT THE NEXT 48 HOURS... TONIGHT'S
WEATHER, MOSTLY CLOUDY. A 50 PERCENT CHANCE OF AREAS OF SNOW UNTIL
MIDNIGHT. THURSDAY, SLIGHT CHANCE OF SNOW IN THE DAY, THEN RAIN AND
SNOW LIKELY IN THE AFTERNOON. IT'LL BE COOLER. SNOW MAY BE HEAVY AT
TIMES IN THE AFTERNOON. SNOW LEVEL 3000 FEET. THURSDAY NIGHT, RAIN
LIKELY. SNOW LIKELY. PATCHY BLOWING SNOW AFTER MIDNIGHT. SNOW MAY BE
HEAVY AT TIMES AFTER MIDNIGHT. VISIBILITY ONE QUARTER MILE OR LESS AT
TIMES AFTER MIDNIGHT. FRIDAY, SNOW LIKELY. RAIN LIKELY. PATCHY
BLOWING SNOW IN THE DAY. SNOW MAY BE HEAVY AT TIMES. VISIBILITY ONE
QUARTER MILE OR LESS AT TIMES IN THE DAY. SNOW LEVEL 3500 FEET.
NORTHWEST MT (ZONES 104 AND 105): - SNOW AND RAIN THURSDAY THROUGH
SATURDAY: FOLLOWING THE FRONT, COOLER AND UNSETTLED WEATHER WILL
PREVAIL FOR THE REMAINDER OF THE WEEK, WITH SNOW LEVELS DROPPING
TO VALLEY FLOORS AT TIMES AND PERIODS OF MOUNTAIN SNOW AFFECTING
TRAVEL. TAKING A QUICK LOOK AT THE NEXT 48 HOURS... TONIGHT'S
WEATHER, MOSTLY CLOUDY WITH A 50 PERCENT CHANCE OF AREAS OF SNOW.
PATCHY BLOWING SNOW UNTIL MIDNIGHT. VISIBILITY ONE QUARTER MILE OR
LESS AT TIMES UNTIL MIDNIGHT. THURSDAY, CLOUDY WITH A 50 PERCENT
CHANCE OF SNOW. IT'LL BE COLDER. THURSDAY NIGHT, RAIN AND SNOW
LIKELY. BLOWING SNOW AFTER MIDNIGHT. SNOW MAY BE HEAVY AT TIMES.
VISIBILITY ONE QUARTER MILE OR LESS AT TIMES AFTER MIDNIGHT. SNOW
LEVEL 4500 FEET. FRIDAY, MOSTLY CLOUDY WITH A 50 PERCENT CHANCE OF
SNOW. PATCHY BLOWING SNOW IN THE DAY. VISIBILITY ONE QUARTER MILE OR
LESS AT TIMES IN THE DAY.
WEST CENTRAL MT (ZONES 106, 107 AND 108): - SNOW AND RAIN THURSDAY
THROUGH SATURDAY: FOLLOWING THE FRONT, COOLER AND UNSETTLED
WEATHER WILL PREVAIL FOR THE REMAINDER OF THE WEEK, WITH SNOW
LEVELS DROPPING TO VALLEY FLOORS AT TIMES AND PERIODS OF MOUNTAIN
SNOW AFFECTING TRAVEL. TAKING A QUICK LOOK AT THE NEXT 48 HOURS...
TONIGHT'S WEATHER, MOSTLY CLOUDY. A 50 PERCENT CHANCE OF AREAS OF
SNOW UNTIL MIDNIGHT. PATCHY BLOWING SNOW UNTIL MIDNIGHT. VISIBILITY
ONE QUARTER MILE OR LESS AT TIMES UNTIL MIDNIGHT. THURSDAY, CLOUDY.
A 50 PERCENT CHANCE OF SNOW IN THE AFTERNOON. IT'LL BE COOLER.
THURSDAY NIGHT, RAIN LIKELY. SNOW LIKELY. PATCHY BLOWING SNOW. SNOW
MAY BE HEAVY AT TIMES AFTER MIDNIGHT. VISIBILITY ONE QUARTER MILE OR
LESS AT TIMES. FRIDAY, RAIN AND SNOW LIKELY IN THE DAY, THEN SNOW
LIKELY IN THE AFTERNOON. PATCHY BLOWING SNOW IN THE DAY. VISIBILITY
ONE QUARTER MILE OR LESS AT TIMES IN THE DAY. SNOW LEVEL 3000 FEET.
SOUTHWEST MT (ZONES 109, 110 AND 111): - SNOW AND RAIN THURSDAY
THROUGH SATURDAY: FOLLOWING THE FRONT, COOLER AND UNSETTLED
WEATHER WILL PREVAIL FOR THE REMAINDER OF THE WEEK, WITH SNOW
LEVELS DROPPING TO VALLEY FLOORS AT TIMES AND PERIODS OF MOUNTAIN
SNOW AFFECTING TRAVEL. TAKING A QUICK LOOK AT THE NEXT 48 HOURS...
TONIGHT'S WEATHER, MOSTLY CLOUDY. A 20 PERCENT CHANCE OF SNOW UNTIL
MIDNIGHT. PATCHY BLOWING SNOW UNTIL MIDNIGHT. IT'LL BE COLDER. SNOW
MAY BE HEAVY AT TIMES UNTIL MIDNIGHT. VISIBILITY ONE QUARTER MILE OR
LESS AT TIMES UNTIL MIDNIGHT. THURSDAY, A CHANCE OF SNOW IN THE DAY,
THEN SNOW LIKELY IN THE AFTERNOON. IT'LL BE COLDER. THURSDAY NIGHT,
RAIN AND SNOW LIKELY. PATCHY BLOWING SNOW. VISIBILITY ONE QUARTER
MILE OR LESS AT TIMES. FRIDAY, SNOW LIKELY. RAIN LIKELY. PATCHY
BLOWING SNOW IN THE DAY. VISIBILITY ONE QUARTER MILE OR LESS AT TIMES
IN THE DAY. SNOW LEVEL 5500 FEET.
IDZ102-103-181100-
PALOUSE/HELLS CANYON-CLEARWATER/NEZ PERCE-
1231 PM PST WED DEC 17 2025
TONIGHT
* SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SNOW.
* MIN TEMPERATURE.....23-33.
* MAX HUMIDITY........70-80 PERCENT VALLEYS AND 80-90 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 5-15 MPH.
* RIDGE TOP............WEST 25-35 MPH BECOMING SOUTHWEST 15-25 MPH
AFTER MIDNIGHT.
* MIXING HEIGHT.......2 KFT AGL UNTIL 0200, THEN 1-2 KFT AGL.
* TRANSPORT WINDS.....WEST 25 MPH UNTIL 2200, THEN SOUTHWEST 15
MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...0 PERCENT IN THE PALOUSE/HELLS CANYON...AND
30 PERCENT IN THE CLEARWATER/NEZ PERCE.
THURSDAY
* SKY/WEATHER.........SNOW. RAIN IN THE AFTERNOON. SNOW LEVEL 3000
FEET.
* MAX TEMPERATURE.....40-50 VALLEYS AND 35-40 RIDGES.
* MIN HUMIDITY........68-78 PERCENT VALLEYS AND 77-87 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTH 5-15 MPH.
* RIDGE TOP............SOUTH 15-25 MPH.
* MIXING HEIGHT.......1-2 KFT AGL.
* TRANSPORT WINDS.....SOUTH 15 MPH UNTIL 1300, THEN 20 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...90 PERCENT.
THURSDAY NIGHT
* SKY/WEATHER.........RAIN AND SNOW. PATCHY BLOWING SNOW AFTER
MIDNIGHT. SNOW LEVEL 6000 FEET.
* MIN TEMPERATURE.....35-40 VALLEYS AND 25-30 RIDGES.
* MAX HUMIDITY........83-93 PERCENT VALLEYS AND 93-100 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 15-25 MPH.
* RIDGE TOP............SOUTHWEST 20-30 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 20 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...100 PERCENT.
FRIDAY
* SKY/WEATHER.........PATCHY BLOWING SNOW IN THE MORNING. SNOW AND
RAIN. SNOW LEVEL 3500 FEET.
* MAX TEMPERATURE.....43-53 VALLEYS AND 30-35 RIDGES.
* MIN HUMIDITY........66-76 PERCENT VALLEYS AND 78-88 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......WEST 5-15 MPH.
* RIDGE TOP............SOUTHWEST 20-30 MPH BECOMING WEST 10-20 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1200, THEN 3 KFT AGL.
* TRANSPORT WINDS.....WEST 20 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...80 PERCENT IN THE PALOUSE/HELLS CANYON...AND
100 PERCENT IN THE CLEARWATER/NEZ PERCE.
SATURDAY
MOSTLY CLOUDY WITH SNOW. CHANCE OF SNOW 80 PERCENT. LOWS
25-35. HIGHS 35-45. MIN HUMIDITIES 55-65 PERCENT. SOUTHWEST WINDS
5-15 MPH.
SUNDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW AND RAIN. CHANCE OF
PRECIPITATION 30 PERCENT. LOWS 25-35. HIGHS 35-45. MIN HUMIDITIES
65-75 PERCENT. SOUTH WINDS 10-15 MPH.
MONDAY
MOSTLY CLOUDY WITH RAIN AND SNOW LIKELY. CHANCE OF
PRECIPITATION 70 PERCENT. LOWS 30-40. HIGHS 35-45. SOUTHWEST WINDS
5-15 MPH.
TUESDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW AND RAIN. CHANCE OF
PRECIPITATION 40 PERCENT. LOWS 25-35. HIGHS 35-45.
WEDNESDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW AND RAIN. CHANCE OF
PRECIPITATION 30 PERCENT. LOWS 30-40. HIGHS 35-45.
MTZ104-105-181100-
KOOTENAI-FLATHEAD/GLACIER PARK-
131 PM MST WED DEC 17 2025
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY. PATCHY BLOWING SNOW IN THE
EVENING. CHANCE OF SNOW.
* MIN TEMPERATURE.....18-28.
* MAX HUMIDITY........73-83 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......WEST 5-15 MPH BECOMING VARIABLE LESS THAN 5
MPH AFTER MIDNIGHT.
* RIDGE TOP............WEST 40-50 MPH DECREASING TO 25-35 MPH AFTER
MIDNIGHT.
* MIXING HEIGHT.......3 KFT AGL UNTIL 2300, THEN 2 KFT AGL.
* TRANSPORT WINDS.....WEST 30 MPH UNTIL 2200, THEN 20 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...10 PERCENT.
THURSDAY
* SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SNOW.
* MAX TEMPERATURE.....30-40.
* MIN HUMIDITY........70-80 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTH 10-20 MPH.
* RIDGE TOP............SOUTH 15-25 MPH.
* MIXING HEIGHT.......1-2 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 20 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT IN THE KOOTENAI...AND 0
PERCENT IN THE FLATHEAD/GLACIER PARK.
* CWR (> 0.10 INCH)...60 PERCENT IN THE KOOTENAI...AND 40 PERCENT
IN THE FLATHEAD/GLACIER PARK.
THURSDAY NIGHT
* SKY/WEATHER.........SNOW AND RAIN. BLOWING SNOW AFTER MIDNIGHT.
SNOW LEVEL 4500 FEET.
* MIN TEMPERATURE.....20-30.
* MAX HUMIDITY........88-98 PERCENT VALLEYS AND 80-90 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTH 5-10 MPH BECOMING SOUTHWEST 5-15 MPH
AFTER MIDNIGHT.
* RIDGE TOP............SOUTHWEST 25-35 MPH INCREASING TO 35-45 MPH
AFTER MIDNIGHT.
* MIXING HEIGHT.......1-2 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 25 MPH UNTIL 0200, THEN WEST 30
MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...100 PERCENT.
FRIDAY
* SKY/WEATHER.........MOSTLY CLOUDY. PATCHY BLOWING SNOW IN THE
MORNING. CHANCE OF SNOW.
* MAX TEMPERATURE.....35-40 VALLEYS AND 25-30 RIDGES.
* MIN HUMIDITY........54-64 PERCENT VALLEYS AND 63-73 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO VARIABLE LESS THAN 7 MPH.
* RIDGE TOP............SOUTHWEST 35-45 MPH BECOMING WEST 20-30 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......3 KFT AGL UNTIL 1100, THEN 5 KFT AGL UNTIL
1600, THEN 4 KFT AGL.
* TRANSPORT WINDS.....WEST 30 MPH UNTIL 1600, THEN 20 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...20 PERCENT IN THE KOOTENAI...AND 60 PERCENT
IN THE FLATHEAD/GLACIER PARK.
SATURDAY
MOSTLY CLOUDY WITH SNOW. CHANCE OF SNOW 80 PERCENT. LOWS
20-30. HIGHS 30-40. MIN HUMIDITIES 60-70 PERCENT. SOUTHWEST WINDS
15-25 MPH.
SUNDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW 50 PERCENT.
LOWS 20-30. HIGHS 30-40. MIN HUMIDITIES 70-80 PERCENT. SOUTH WINDS
15-25 MPH.
MONDAY
MOSTLY CLOUDY WITH SNOW AND RAIN LIKELY. CHANCE OF
PRECIPITATION 70 PERCENT. LOWS 25-35. HIGHS 30-40. SOUTHWEST WINDS
10-20 MPH.
TUESDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW
40 PERCENT. LOWS 25-35. HIGHS 30-40.
WEDNESDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW
30 PERCENT. LOWS 20-30. HIGHS 30-40.
MTZ106-108-181100-
WEST LOLO-EAST LOLO-
131 PM MST WED DEC 17 2025
TONIGHT
* SKY/WEATHER.........MOSTLY CLOUDY. PATCHY BLOWING SNOW IN THE
EVENING. SLIGHT CHANCE OF SNOW.
* MIN TEMPERATURE.....20-30.
* MAX HUMIDITY........72-82 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......WEST 25-35 MPH.
* RIDGE TOP............WEST 35-45 MPH DECREASING TO 25-35 MPH AFTER
MIDNIGHT.
* MIXING HEIGHT.......3 KFT AGL UNTIL 2100, THEN 1-2 KFT AGL.
* TRANSPORT WINDS.....WEST 35 MPH UNTIL 2100. 15 MPH AFTER 0200.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...10 PERCENT.
THURSDAY
* SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SNOW.
* MAX TEMPERATURE.....35-40.
* MIN HUMIDITY........63-73 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......CALM TO VARIABLE LESS THAN 7 MPH.
* RIDGE TOP............SOUTHWEST 10-20 MPH.
* MIXING HEIGHT.......1-2 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 15 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...50 PERCENT IN THE WEST LOLO...AND 20 PERCENT
IN THE EAST LOLO.
THURSDAY NIGHT
* SKY/WEATHER.........PATCHY BLOWING SNOW. SNOW AND RAIN. SNOW
LEVEL 5500 FEET.
* MIN TEMPERATURE.....25-35.
* MAX HUMIDITY........81-91 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 20-30 MPH.
* RIDGE TOP............SOUTHWEST 30-40 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 20 MPH UNTIL 0100, THEN 25 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...100 PERCENT.
FRIDAY
* SKY/WEATHER.........MOSTLY CLOUDY. PATCHY BLOWING SNOW IN THE
MORNING. RAIN IN THE MORNING. SNOW.
* MAX TEMPERATURE.....30-40.
* MIN HUMIDITY........61-71 PERCENT VALLEYS AND 70-80 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......WEST 5-15 MPH.
* RIDGE TOP............SOUTHWEST 30-40 MPH BECOMING WEST 15-25 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1000, THEN 3 KFT AGL UNTIL
1300, THEN 5 KFT AGL UNTIL 1600, THEN 4 KFT AGL.
* TRANSPORT WINDS.....WEST 25 MPH UNTIL 1300, THEN 30 MPH UNTIL
1600, THEN 20 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...60 PERCENT IN THE WEST LOLO...AND 80 PERCENT
IN THE EAST LOLO.
SATURDAY
MOSTLY CLOUDY WITH SNOW LIKELY. CHANCE OF SNOW 60 PERCENT.
LOWS 25-35. HIGHS 30-40. MIN HUMIDITIES 55-65 PERCENT. SOUTHWEST WINDS
10-20 MPH.
SUNDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW 30 PERCENT.
LOWS 20-30. HIGHS 35-45. MIN HUMIDITIES 65-75 PERCENT. SOUTH WINDS
10-20 MPH.
MONDAY
MOSTLY CLOUDY WITH SNOW LIKELY AND CHANCE OF RAIN. CHANCE OF
PRECIPITATION 60 PERCENT. LOWS 30-40. HIGHS 35-45. SOUTHWEST WINDS
10-15 MPH.
TUESDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW
30 PERCENT. LOWS 20-30. HIGHS 35-45.
WEDNESDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW
30 PERCENT. LOWS 25-35. HIGHS 35-45.
MTZ107-181100-
FLATHEAD RESERVATION-
131 PM MST WED DEC 17 2025
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY. PATCHY BLOWING SNOW IN THE
EVENING. SLIGHT CHANCE OF SNOW.
* MIN TEMPERATURE.....30-35 VALLEYS AND 15-20 RIDGES.
* MAX HUMIDITY........69-79 PERCENT VALLEYS AND 83-93 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 15-25 MPH BECOMING SOUTH 5-15 MPH
AFTER MIDNIGHT.
* RIDGE TOP............WEST 35-45 MPH DECREASING TO 25-35 MPH AFTER
MIDNIGHT.
* MIXING HEIGHT.......2 KFT AGL UNTIL 2400, THEN 1-2 KFT AGL.
* TRANSPORT WINDS.....WEST 30 MPH UNTIL 2000. SOUTHWEST 10 MPH
AFTER 0400.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...10 PERCENT.
THURSDAY
* SKY/WEATHER.........MOSTLY CLOUDY.
* MAX TEMPERATURE.....40-45 VALLEYS AND 30-35 RIDGES.
* MIN HUMIDITY........64-74 PERCENT VALLEYS AND 70-80 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTH 5-15 MPH.
* RIDGE TOP............SOUTH 15-25 MPH.
* MIXING HEIGHT.......1-2 KFT AGL.
* TRANSPORT WINDS.....SOUTH 15 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...20 PERCENT.
THURSDAY NIGHT
* SKY/WEATHER.........RAIN AND SNOW. PATCHY BLOWING SNOW AFTER
MIDNIGHT. SNOW LEVEL 5000 FEET.
* MIN TEMPERATURE.....30-35 VALLEYS AND 20-25 RIDGES.
* MAX HUMIDITY........75-85 PERCENT VALLEYS AND 91 PERCENT RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTH 20-30 MPH.
* RIDGE TOP............SOUTHWEST 30-40 MPH.
* MIXING HEIGHT.......1-2 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 20 MPH UNTIL 0400, THEN WEST 20
MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...100 PERCENT.
FRIDAY
* SKY/WEATHER.........MOSTLY CLOUDY. PATCHY BLOWING SNOW IN THE
MORNING. RAIN LIKELY IN THE MORNING. SNOW LIKELY.
* MAX TEMPERATURE.....45-50 VALLEYS AND 25-30 RIDGES.
* MIN HUMIDITY........50-60 PERCENT VALLEYS AND 67-77 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 5-15 MPH.
* RIDGE TOP............SOUTHWEST 30-40 MPH BECOMING WEST 20-30 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......2 KFT AGL UNTIL 1000, THEN 4 KFT AGL UNTIL
1300, THEN 5 KFT AGL UNTIL 1600, THEN 4 KFT AGL.
* TRANSPORT WINDS.....WEST 25 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...40 PERCENT IN AREAS WEST OF HIGHWAY 93...AND
70 PERCENT IN THE MISSION MTNS AND AREAS EAST OF HIGHWAY 93.
SATURDAY
MOSTLY CLOUDY WITH SNOW LIKELY. CHANCE OF SNOW 60 PERCENT.
LOWS 25-35. HIGHS 35-45. MIN HUMIDITIES 55-65 PERCENT. SOUTHWEST WINDS
10-20 MPH.
SUNDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW 30 PERCENT.
LOWS 25-35. HIGHS 35-45. MIN HUMIDITIES 65-75 PERCENT. SOUTH WINDS
10-20 MPH.
MONDAY
MOSTLY CLOUDY WITH SNOW LIKELY AND CHANCE OF RAIN. CHANCE OF
PRECIPITATION 60 PERCENT. LOWS 30-40. HIGHS 35-45. SOUTH WINDS
5-15 MPH.
TUESDAY
PARTLY CLOUDY WITH CHANCE OF SNOW AND RAIN. CHANCE OF
PRECIPITATION 30 PERCENT. LOWS 25-35. HIGHS 35-45.
WEDNESDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW AND RAIN. CHANCE OF
PRECIPITATION 30 PERCENT. LOWS 25-35. HIGHS 35-45.
MTZ109-181100-
BITTERROOT-
131 PM MST WED DEC 17 2025
TONIGHT
* SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SNOW.
* MIN TEMPERATURE.....15-25.
* MAX HUMIDITY........68-78 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 15-25 MPH BECOMING SOUTH 5-15 MPH
AFTER MIDNIGHT.
* RIDGE TOP............WEST 35-45 MPH DECREASING TO 25-35 MPH AFTER
MIDNIGHT.
* MIXING HEIGHT.......3 KFT AGL UNTIL 2000, THEN 1-2 KFT AGL.
* TRANSPORT WINDS.....WEST 30 MPH UNTIL 2100. SOUTHWEST 10 MPH
AFTER 0400.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...20 PERCENT.
THURSDAY
* SKY/WEATHER.........SNOW.
* MAX TEMPERATURE.....40-45 VALLEYS AND 30-35 RIDGES.
* MIN HUMIDITY........62-72 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTH 10-20 MPH.
* RIDGE TOP............SOUTHWEST 5-15 MPH INCREASING TO 15-25 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......1-2 KFT AGL.
* TRANSPORT WINDS.....SOUTH 15 MPH UNTIL 1200, THEN SOUTHWEST 20
MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...80 PERCENT IN THE DARBY, SULA, AND WEST FORK
DISTRICTS...AND 20 PERCENT IN AREAS NORTH OF HAMILTON.
THURSDAY NIGHT
* SKY/WEATHER.........PATCHY BLOWING SNOW. SNOW AND RAIN. SNOW
LEVEL 6000 FEET.
* MIN TEMPERATURE.....25-35.
* MAX HUMIDITY........80-90 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 25-35 MPH.
* RIDGE TOP............SOUTHWEST 30-40 MPH.
* MIXING HEIGHT.......1-2 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 25 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...100 PERCENT.
FRIDAY
* SKY/WEATHER.........PATCHY BLOWING SNOW IN THE MORNING. RAIN IN
THE MORNING. SNOW. SNOW LEVEL 4500 FEET.
* MAX TEMPERATURE.....45-50 VALLEYS AND 30-35 RIDGES.
* MIN HUMIDITY........65-75 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 10-15 MPH.
* RIDGE TOP............SOUTHWEST 30-40 MPH BECOMING WEST 15-25 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......1-2 KFT AGL UNTIL 1300, THEN 4 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 25 MPH UNTIL 1100, THEN WEST 15
MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...100 PERCENT.
SATURDAY
COLDER. MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW
50 PERCENT. LOWS 20-30. HIGHS 25-35. MIN HUMIDITIES 50-60 PERCENT.
SOUTHWEST WINDS 15-25 MPH.
SUNDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW 40 PERCENT.
LOWS 15-25. HIGHS 35-45. MIN HUMIDITIES 60-70 PERCENT. SOUTH WINDS
10-20 MPH.
MONDAY
MOSTLY CLOUDY WITH SNOW LIKELY AND CHANCE OF RAIN. CHANCE OF
PRECIPITATION 60 PERCENT. LOWS 30-40. HIGHS 35-45. SOUTHWEST WINDS
10-20 MPH.
TUESDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW
30 PERCENT. LOWS 20-30. HIGHS 35-45.
WEDNESDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW AND RAIN. CHANCE OF
PRECIPITATION 30 PERCENT. LOWS 25-35. HIGHS 35-45.
MTZ110-111-181100-
DEERLODGE/WEST BEAVERHEAD-EAST BEAVERHEAD-
131 PM MST WED DEC 17 2025
TONIGHT
* SKY/WEATHER.........PARTLY CLOUDY. PATCHY BLOWING SNOW IN THE
EVENING. SLIGHT CHANCE OF SNOW.
* MIN TEMPERATURE.....15-25.
* MAX HUMIDITY........59-69 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......WEST 30-40 MPH BECOMING SOUTHWEST 20-30 MPH
AFTER MIDNIGHT.
* RIDGE TOP............WEST 35-45 MPH DECREASING TO 25-35 MPH AFTER
MIDNIGHT.
* MIXING HEIGHT.......4 KFT AGL UNTIL 1900. BELOW 500 FT TO 1 KFT
AGL AFTER 0100.
* TRANSPORT WINDS.....WEST 35 MPH UNTIL 2300. 15 MPH AFTER 0300.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...10 PERCENT.
THURSDAY
* SKY/WEATHER.........MOSTLY CLOUDY.
* MAX TEMPERATURE.....40-45 VALLEYS AND 25-35 RIDGES.
* MIN HUMIDITY........47-57 PERCENT VALLEYS AND 58-68 PERCENT
RIDGES.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTH 20-30 MPH.
* RIDGE TOP............SOUTHWEST 20-30 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1200, THEN 2
KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 20 MPH UNTIL 1200, THEN 25 MPH.
* CHANCE LIGHTNING....0 PERCENT.
* CWR (> 0.10 INCH)...30 PERCENT IN THE DEERLODGE/WEST
BEAVERHEAD...AND 10 PERCENT IN THE EAST BEAVERHEAD.
THURSDAY NIGHT
* SKY/WEATHER.........MOSTLY CLOUDY. SNOW AND RAIN. SNOW LEVEL 6000
FEET.
* MIN TEMPERATURE.....23-33.
* MAX HUMIDITY........69-79 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 25-35 MPH.
* RIDGE TOP............SOUTHWEST 25-35 MPH.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 25 MPH UNTIL 0200, THEN 30 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...90 PERCENT IN THE DEERLODGE/WEST
BEAVERHEAD...AND 10 PERCENT IN THE EAST BEAVERHEAD.
FRIDAY
* SKY/WEATHER.........MOSTLY CLOUDY. SNOW AND RAIN. SNOW LEVEL 6000
FEET.
* MAX TEMPERATURE.....40-50 VALLEYS AND 30-35 RIDGES.
* MIN HUMIDITY........56-66 PERCENT.
* 20-FOOT WINDS.......
* LOWER ELEVATION......SOUTHWEST 25-35 MPH.
* RIDGE TOP............SOUTHWEST 25-35 MPH DECREASING TO 15-25 MPH
IN THE AFTERNOON.
* MIXING HEIGHT.......BELOW 500 FT TO 1 KFT AGL UNTIL 1000, THEN 3
KFT AGL.
* TRANSPORT WINDS.....SOUTHWEST 30 MPH.
* CHANCE LIGHTNING....NEAR 0 PERCENT.
* CWR (> 0.10 INCH)...90 PERCENT IN THE DEERLODGE/WEST
BEAVERHEAD...AND 40 PERCENT IN THE EAST BEAVERHEAD.
SATURDAY
COLDER. PARTLY CLOUDY WITH SLIGHT CHANCE OF SNOW. CHANCE OF
SNOW 20 PERCENT. LOWS 15-25. HIGHS 25-35. MIN HUMIDITIES 45-55 PERCENT.
WEST WINDS 15-25 MPH.
SUNDAY
PARTLY CLOUDY WITH CHANCE OF SNOW. CHANCE OF SNOW 30 PERCENT.
LOWS 15-25. HIGHS 35-45. MIN HUMIDITIES 55-65 PERCENT. SOUTH WINDS
10-20 MPH.
MONDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW AND RAIN. CHANCE OF
PRECIPITATION 50 PERCENT. LOWS 30-40. HIGHS 35-45. SOUTHWEST WINDS
10-20 MPH.
TUESDAY
MOSTLY CLOUDY WITH SLIGHT CHANCE OF SNOW. CHANCE OF SNOW
20 PERCENT. LOWS 20-30. HIGHS 35-45.
WEDNESDAY
MOSTLY CLOUDY WITH SLIGHT CHANCE OF SNOW. CHANCE OF SNOW
20 PERCENT. LOWS 25-35. HIGHS 35-45.
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