377
FNUS55 KMSO 171925
FWFMSO

Fire Weather Planning Forecast for Wrn Montana and N Cntrl Idaho
National Weather Service Missoula MT
125 PM MDT Sun Aug 17 2025


.DISCUSSION...

Idaho (Zones 102 and 103): A few showers and thunderstorms will develop
through this evening across eastern portions of the Nez Perce-Clearwater
NF. Nocturnal convection will develop across northeast Oregon, with
showers and perhaps an isolated thunderstorm moving through Monday
morning. A warming trend is expected into Tuesday, with high-based
shower and thunderstorm activity each afternoon and evening.

Northwest MT (Zones 104 and 105): Scattered showers and perhaps and
isolated thunderstorm will move into the region late Monday morning into
the early afternoon. A warming trend is expected into Tuesday, with
high-based shower and thunderstorm activity each afternoon and evening.
A disturbance Wednesday into Thursday will cause temperatures to cool
with increased westerly winds.

West Central MT (Zones 106, 107 and 108): Additional rounds of showers
and thunderstorms are expected across the east Lolo NF through this
evening. Convection will be capable of producing brief heavy rain, with
isolated areas of wetting rains. A warming trend is expected into
Tuesday, with high-based shower and thunderstorm activity each afternoon
and evening.

Southwest MT (Zones 109, 110 and 111): Additional rounds of showers
and thunderstorms are expected through this evening. Convection will be
capable of producing brief heavy rains and outflow winds. The risk for
outflow winds will focus east of the divide, with a 70% probability for
wind gusts over 30 mph. A warming trend is expected into Tuesday, with
high-based shower and thunderstorm activity each afternoon and evening.

View Weather Briefing videos on our YouTube channel
at https://www.youtube.com/NWSMissoula

IDZ102-103-181930-
Palouse/Hells Canyon-Clearwater/Nez Perce-
1225 PM PDT Sun Aug 17 2025

.TONIGHT...
* Sky/Weather.........Partly cloudy. Slight chance of rain showers
  and thunderstorms.
* Min Temperature.....50-60.
* Max Humidity........57-67 percent.
* 20-Foot Winds.......
*     Lower Elevation......Downslope/downvalley 2-5 mph becoming
      variable less than 5 mph after midnight.
*     Ridge Top............Northwest up to 5 mph becoming southeast
      5-10 mph after midnight.
* Mixing Height.......6 kft agl until 2000, then below 500 ft to 1
  kft agl.
* Transport Winds.....West 10 mph until 2100. Variable less than 10
  mph after 0500.
* Chance Lightning....20 percent in the Palouse/Hells Canyon...and
  25 percent in the Clearwater/Nez Perce.
* CWR (> 0.10 Inch)...0 percent.

.MONDAY...
* Sky/Weather.........Partly cloudy. Slight chance of rain showers.
  Slight chance of thunderstorms in the afternoon.
* Max Temperature.....90-100 valleys and 75-80 ridges.
* Min Humidity........21-31 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.......3 kft agl until 1100. 9 kft agl after 1400.
* Transport Winds.....Variable less than 10 mph until 1000, then
  southwest 10 mph until 1300, then 15 mph.
* Chance Lightning....15 percent in the Palouse/Hells Canyon...and
  25 percent in the Clearwater/Nez Perce.
* CWR (> 0.10 Inch)...0 percent.

.MONDAY NIGHT...
* Sky/Weather.........Mostly clear.
* Min Temperature.....55-60 valleys and 48-58 ridges.
* Max Humidity........65-75 percent valleys and 58-68 percent
  ridges.
* 20-Foot Winds.......
*     Lower Elevation......Downslope/downvalley 1-3 mph.
*     Ridge Top............Northwest 5-10 mph becoming southeast up to
      5 mph after midnight.
* Mixing Height.......8 kft agl until 1900. Below 500 ft to 1 kft
  agl after 2000.
* Transport Winds.....West 10 mph until 2100, then variable less
  than 10 mph.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.TUESDAY...
* Sky/Weather.........Mostly sunny.
* Max Temperature.....95-105 valleys and 80-90 ridges.
* Min Humidity........17-27 percent.
* 20-Foot Winds.......
*     Lower Elevation......Calm to becoming upslope/upvalley 4-8 mph in
      the afternoon.
*     Ridge Top............Southeast up to 5 mph becoming west 5-10 mph
      in the afternoon.
* Mixing Height.......3 kft agl until 1100, then 7 kft agl until 1900,
* Transport Winds.....Variable less than 10 mph until 0800. 10 mph
after 1700.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.WEDNESDAY...Not as warm. Mostly clear. Lows 55-65. Highs 80-90. Min
humidities 15-25 percent. Northwest winds 5-10 mph.
.THURSDAY...Mostly clear. Lows 55-65. Highs 80-90. Min humidities
10-20 percent. West winds 5-10 mph.
.FRIDAY...Clear. Lows 55-65. Highs 85-95. Northeast winds 5-10 mph.
.SATURDAY...Mostly clear. Lows 55-65. Highs 90-100.
.SUNDAY...Mostly clear. Lows 60-70. Highs 85-95.

$$

MTZ104-105-181930-
Kootenai-Flathead/Glacier Park-
125 PM MDT Sun Aug 17 2025

.TONIGHT...
* Sky/Weather.........Partly cloudy.
* Min Temperature.....45-55.
* Max Humidity........81-91 percent valleys and 61-71 percent
  ridges.
* 20-Foot Winds.......
*     Lower Elevation......Downslope/downvalley 1-3 mph.
*     Ridge Top............Southwest 5-15 mph.
* Mixing Height.......7 kft agl until 2000, then below 500 ft to 1
  kft agl.
* Transport Winds.....Southwest 10 mph until 0200, then variable
  less than 10 mph.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.MONDAY...
* Sky/Weather.........Partly cloudy. Slight chance of rain showers.
  Slight chance of thunderstorms in the afternoon.
* Max Temperature.....80-90 valleys and 65-75 ridges.
* Min Humidity........23-33 percent valleys and 34-44 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.......3 kft agl until 1100. 8 kft agl after 1300.
* Transport Winds.....South 10 mph until 1300, then southwest 15
  mph.
* Chance Lightning....20 percent.
* CWR (> 0.10 Inch)...0 percent.

.MONDAY NIGHT...
* Sky/Weather.........Partly cloudy.
* Min Temperature.....50-60.
* Max Humidity........83-93 percent valleys and 57-67 percent
  ridges.
* 20-Foot Winds.......
*     Lower Elevation......Downslope/downvalley 1-3 mph.
*     Ridge Top............Southwest 5-10 mph becoming south after
      midnight.
* Mixing Height.......8 kft agl until 1900. Below 500 ft to 1 kft
  agl after 2000.
* Transport Winds.....Southwest 15 mph until 2000, then variable
  less than 10 mph.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.TUESDAY...
* Sky/Weather.........Mostly sunny.
* Max Temperature.....90-95 valleys and 70-80 ridges.
* Min Humidity........16-26 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.......2 kft agl until 1000. 10 kft agl after 1400.
* Transport Winds.....Southwest 10 mph until 1400, then 15 mph.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.WEDNESDAY...Not as warm. Mostly clear. Lows 55-65. Highs 75-85. Min
humidities 15-25 percent. Southwest winds 10-15 mph.
.THURSDAY...Mostly clear. Lows 50-60. Highs 75-85. Min humidities
10-20 percent. West winds 10-15 mph.
.FRIDAY...Mostly clear. Lows 50-60. Highs 75-85. Northeast winds
10-15 mph.
.SATURDAY...Mostly clear. Lows 50-60. Highs 80-90.
.SUNDAY...Mostly clear. Lows 50-60. Highs 80-90.

$$

MTZ106-108-181930-
West Lolo-East Lolo-
125 PM MDT Sun Aug 17 2025

.TONIGHT...
* Sky/Weather.........Partly cloudy. Slight chance of rain showers.
* Min Temperature.....45-55.
* Max Humidity........70-80 percent valleys and 64-74 percent
  ridges.
* 20-Foot Winds.......
*     Lower Elevation......Downslope/downvalley 1-3 mph.
*     Ridge Top............West 5-10 mph becoming south after midnight.
* Mixing Height.......6 kft agl until 2000. Below 500 ft to 1 kft
  agl after 2100.
* Transport Winds.....Southwest 10 mph until 0100, then variable
  less than 10 mph.
* Chance Lightning....Near 0 percent in the West Lolo...and 25
  percent in the East Lolo.
* CWR (> 0.10 Inch)...0 percent.

.MONDAY...
* Sky/Weather.........Partly cloudy. Slight chance of thunderstorms
  in the afternoon.
* Max Temperature.....80-90 valleys and 73-83 ridges.
* Min Humidity........22-32 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.......3 kft agl until 1100. 10 kft agl after 1500.
* Transport Winds.....South 10 mph until 1200, then southwest 15
  mph until 1500, then 20 mph.
* Chance Lightning....20 percent in the West Lolo...and 25 percent
  in the East Lolo.
* CWR (> 0.10 Inch)...0 percent.

.MONDAY NIGHT...
* Sky/Weather.........Partly cloudy.
* Min Temperature.....50-60.
* Max Humidity........68-78 percent valleys and 54-64 percent
  ridges.
* 20-Foot Winds.......
*     Lower Elevation......Northwest 5-10 mph.
*     Ridge Top............Northwest 5-10 mph becoming southeast after
      midnight.
* Mixing Height.......9 kft agl until 1900. Below 500 ft to 1 kft
  agl after 2000.
* Transport Winds.....Southwest 15 mph until 2000, then variable
  less than 10 mph.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.TUESDAY...
* Sky/Weather.........Mostly sunny.
* Max Temperature.....88-98 valleys and 78-88 ridges.
* Min Humidity........14-24 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.......3 kft agl until 1100. 11 kft agl after 1600.
* Transport Winds.....Southwest 10 mph until 1400, then 15 mph.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.WEDNESDAY...Not as warm. Partly cloudy with slight chance of rain
showers and thunderstorms. Chance of precipitation 20 percent. Lows
55-65. Highs 80-90. Min humidities 15-25 percent. West winds 5-10 mph.
.THURSDAY...Mostly clear. Lows 50-60. Highs 80-90. Min humidities
10-20 percent. West winds 10-15 mph.
.FRIDAY...Mostly clear. Lows 50-60. Highs 80-90. Northeast winds
5-10 mph.
.SATURDAY...Mostly clear. Lows 50-60. Highs 85-95.
.SUNDAY...Mostly clear. Lows 55-65. Highs 85-95.

$$

MTZ107-181930-
Flathead Reservation-
125 PM MDT Sun Aug 17 2025

.TONIGHT...
* Sky/Weather.........Partly cloudy.
* Min Temperature.....50-60.
* Max Humidity........70-80 percent valleys and 61-71 percent
  ridges.
* 20-Foot Winds.......
*     Lower Elevation......Downslope/downvalley 1-3 mph.
*     Ridge Top............Southwest 5-10 mph.
* Mixing Height.......7 kft agl until 2000, then below 500 ft to 1
  kft agl.
* Transport Winds.....Variable less than 10 mph.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.MONDAY...
* Sky/Weather.........Partly cloudy. Slight chance of thunderstorms
  in the afternoon.
* Max Temperature.....85-90 valleys and 65-70 ridges.
* Min Humidity........20-30 percent valleys and 32-42 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.......3 kft agl until 1100. 10 kft agl after 1400.
* Transport Winds.....Variable less than 10 mph until 1200, then
  southwest 15 mph.
* Chance Lightning....20 percent in areas west of Highway 93...and
  25 percent in the Mission Mtns and areas east of Highway 93.
* CWR (> 0.10 Inch)...0 percent.

.MONDAY NIGHT...
* Sky/Weather.........Mostly clear.
* Min Temperature.....55-60.
* Max Humidity........68-78 percent valleys and 58-68 percent
  ridges.
* 20-Foot Winds.......
*     Lower Elevation......North 5-10 mph.
*     Ridge Top............Northwest 5-10 mph becoming southeast after
      midnight.
* Mixing Height.......9 kft agl until 1900. Below 500 ft to 1 kft
  agl after 2000.
* Transport Winds.....West 15 mph until 2000, then variable less
  than 10 mph.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.TUESDAY...
* Sky/Weather.........Mostly sunny.
* Max Temperature.....95-100 valleys and 70-75 ridges.
* Min Humidity........14-24 percent valleys and 20-30 percent
  ridges.
* 20-Foot Winds.......
*     Lower Elevation......Calm to becoming upslope/upvalley 4-8 mph in
      the afternoon.
*     Ridge Top............South 5-10 mph becoming west in the
      afternoon.
* Mixing Height.......3 kft agl until 1100. 12 kft agl after 1600.
* Transport Winds.....Variable less than 10 mph until 0800, then
  southwest 10 mph until 1500, then 15 mph.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.WEDNESDAY...Partly cloudy with slight chance of rain showers and
thunderstorms. Chance of precipitation 20 percent. Lows 60-70. Highs
85-95. Min humidities 10-20 percent. West winds 10-15 mph.
.THURSDAY...Mostly clear. Lows 55-65. Highs 80-90. Min humidities
10-20 percent. West winds 10-15 mph.
.FRIDAY...Mostly clear. Lows 55-65. Highs 85-95. North winds 5-10 mph.
.SATURDAY...Mostly clear. Lows 55-65. Highs 85-95.
.SUNDAY...Mostly clear. Lows 55-65. Highs 85-95.

$$

MTZ109-181930-
Bitterroot-
125 PM MDT Sun Aug 17 2025

.TONIGHT...
* Sky/Weather.........Partly cloudy. Haze. Chance of rain showers
  and slight chance of thunderstorms.
* Min Temperature.....50-55.
* Max Humidity........83-93 percent valleys and 66-76 percent
  ridges.
* 20-Foot Winds.......
*     Lower Elevation......Downslope/downvalley 2-5 mph.
*     Ridge Top............West up to 5 mph becoming south 5-10 mph
      after midnight.
* Mixing Height.......5 kft agl until 2000, then 1-2 kft agl.
* Transport Winds.....West 10 mph until 2100, then variable less
  than 10 mph.
* Chance Lightning....25 percent in the Darby, Sula, and West Fork
  Districts...and 20 percent in areas north of Hamilton.
* CWR (> 0.10 Inch)...0 percent.

.MONDAY...
* Sky/Weather.........Partly cloudy. Slight chance of thunderstorms
  in the afternoon.
* Max Temperature.....85-90 valleys and 75-80 ridges.
* Min Humidity........23-33 percent.
* 20-Foot Winds.......
*     Lower Elevation......Calm to variable less than 7 mph.
*     Ridge Top............Southwest 5-10 mph.
* Mixing Height.......1-2 kft agl until 1000. 10 kft agl after
  1300.
* Transport Winds.....South 10 mph until 1200, then southwest 20
  mph.
* Chance Lightning....25 percent.
* CWR (> 0.10 Inch)...0 percent.

.MONDAY NIGHT...
* Sky/Weather.........Partly cloudy.
* Min Temperature.....50-60.
* Max Humidity........68-78 percent valleys and 52-62 percent
  ridges.
* 20-Foot Winds.......
*     Lower Elevation......Northwest 5-10 mph in the evening becoming
      downslope/downvalley 2-5 mph.
*     Ridge Top............West 5-10 mph becoming south up to 5 mph
      after midnight.
* Mixing Height.......8 kft agl until 1900. 1-2 kft agl after 2000.
* Transport Winds.....Southwest 15 mph until 2000, then variable
  less than 10 mph.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.TUESDAY...
* Sky/Weather.........Mostly sunny.
* Max Temperature.....95-100 valleys and 80-85 ridges.
* Min Humidity........12-22 percent.
* 20-Foot Winds.......
*     Lower Elevation......Calm to variable less than 7 mph.
*     Ridge Top............Southwest 5-10 mph.
* Mixing Height.......2 kft agl until 1000, then 8 kft agl 1700.
* Transport Winds.....South 10 mph until 1200, then southwest 15
  mph.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.WEDNESDAY...Partly cloudy with slight chance of rain showers and
thunderstorms. Chance of precipitation 20 percent. Lows 55-65. Highs
80-90. Min humidities 15-25 percent. West winds 5-10 mph.
.THURSDAY...Mostly clear. Lows 50-60. Highs 75-85. Min humidities
10-20 percent. West winds 10-15 mph.
.FRIDAY...Mostly clear. Lows 50-60. Highs 80-90. North winds 5-10 mph.
.SATURDAY...Mostly clear. Lows 50-60. Highs 80-90.
.SUNDAY...Partly cloudy. Lows 55-65. Highs 80-90.

$$

MTZ110-111-181930-
Deerlodge/West Beaverhead-East Beaverhead-
125 PM MDT Sun Aug 17 2025

.TONIGHT...
* Sky/Weather.........Partly cloudy. Chance of rain showers and
  thunderstorms.
* Min Temperature.....38-48 valleys and 45-50 ridges.
* Max Humidity........89-99 percent valleys and 71-81 percent
  ridges.
* 20-Foot Winds.......
*     Lower Elevation......South 5-15 mph.
*     Ridge Top............South 5-15 mph.
* Mixing Height.......3 kft agl until 2000, then below 500 ft to 1
  kft agl.
* Transport Winds.....West 15 mph until 2000, then variable less
  than 10 mph.
* Chance Lightning....30 percent.
* CWR (> 0.10 Inch)...10 percent.

.MONDAY...
* Sky/Weather.........Partly cloudy. Slight chance of thunderstorms
  in the afternoon.
* Max Temperature.....80-90 valleys and 70-75 ridges.
* Min Humidity........17-27 percent.
* 20-Foot Winds.......
*     Lower Elevation......Southwest 5-15 mph.
*     Ridge Top............Southwest 10-20 mph.
* Mixing Height.......1-2 kft agl until 1000, increasing to 9 kft agl
  through the afternoon.
* Transport Winds.....South 10 mph until 1100, then southwest 20
  mph.
* Chance Lightning....30 percent in the Deerlodge/West
  Beaverhead...and 25 percent in the East Beaverhead.
* CWR (> 0.10 Inch)...10 percent.

.MONDAY NIGHT...
* Sky/Weather.........Partly cloudy.
* Min Temperature.....43-53 valleys and 50-55 ridges.
* Max Humidity........58-68 percent valleys and 40-50 percent
  ridges.
* 20-Foot Winds.......
*     Lower Elevation......South 5-15 mph.
*     Ridge Top............South 5-15 mph.
* Mixing Height.......9 kft agl until 1900. Below 500 ft to 1 kft
  agl after 2000.
* Transport Winds.....Southwest 15 mph until 2100, then variable
  less than 10 mph.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.TUESDAY...
* Sky/Weather.........Mostly sunny.
* Max Temperature.....85-95 valleys and 80-85 ridges.
* Min Humidity........7-15 percent.
* 20-Foot Winds.......
*     Lower Elevation......Southwest 5-15 mph.
*     Ridge Top............Southwest 5-15 mph.
* Mixing Height.......1-2 kft agl until 1000. Greater than 12 kft
  agl after 1500.
* Transport Winds.....South 10 mph until 1100, then southwest 20
  mph.
* Chance Lightning....Near 0 percent.
* CWR (> 0.10 Inch)...0 percent.

.WEDNESDAY...Partly cloudy. Lows 55-65. Highs 80-90. Min humidities
10-20 percent. Southwest winds 10-15 mph.
.THURSDAY...Mostly clear. Lows 50-60. Highs 75-85. Min humidities
15-25 percent. Northwest winds 10-15 mph.
.FRIDAY...Mostly clear. Lows 45-55. Highs 75-85. North winds 10-15 mph.
.SATURDAY...Mostly clear. Lows 45-55. Highs 80-90.
.SUNDAY...Partly cloudy with slight chance of snow showers. Chance of
snow 20 percent. Lows 50-60. Highs 75-85.

$$