FNUS55 KMSO 202003 FWFMSO Fire Weather Planning Forecast for Wrn Montana and N Cntrl Idaho National Weather Service Missoula MT 202 PM MDT Mon Apr 20 2026 .DISCUSSION... Idaho (Zones 102 and 103): /NOTICE/ The afternoon fire weather zones synopsis and forecast are automatically generated through late spring. Taking a quick look at the next 48 hours... Tonight's weather, partly cloudy. Tuesday, mostly sunny. Tuesday Night, slight chance of thunderstorms. Chance of rain showers until midnight, then rain showers likely after midnight. Wednesday, rain and snow likely. It'll be much cooler. Northwest MT (Zones 104 and 105): /NOTICE/ The afternoon fire weather zones synopsis and forecast are automatically generated through late spring. Taking a quick look at the next 48 hours... Tonight's weather, partly cloudy. Tuesday, mostly sunny. Tuesday Night, mostly cloudy with a 20 percent chance of rain. Wednesday, a chance of rain in the morning, then rain showers, snow showers likely and a slight chance of thunderstorms in the afternoon. It'll be much cooler. Snow may be heavy at times in the afternoon. West Central MT (Zones 106, 107 and 108): /NOTICE/ The afternoon fire weather zones synopsis and forecast are automatically generated through late spring. Taking a quick look at the next 48 hours... Tonight's weather, partly cloudy. Tuesday, mostly sunny. Tuesday Night, mostly cloudy. A 20 percent chance of rain after midnight. Wednesday, slight chance of thunderstorms. Rain showers likely. It'll be much cooler. Southwest MT (Zones 109, 110 and 111): /NOTICE/ The afternoon fire weather zones synopsis and forecast are automatically generated through late spring. Taking a quick look at the next 48 hours... Tonight's weather, partly cloudy. Tuesday, partly cloudy. Tuesday Night, partly cloudy. Humidities will be a little higher. Wednesday, a chance of rain and snow in the morning, then rain showers, snow showers likely and a slight chance of thunderstorms in the afternoon. It'll be much cooler. Humidities will be higher. IDZ102-103-211000- Palouse/Hells Canyon-Clearwater/Nez Perce- 102 PM PDT Mon Apr 20 2026 .TONIGHT... * Sky/Weather.........Partly cloudy. * Min Temperature.....40-50. * Max Humidity........57-67 percent valleys and 45-55 percent ridges. * 20-Foot Winds....... * Lower Elevation......East 5-10 mph. * Ridge Top............Southeast 10-15 mph. * Mixing Height.......6 kft agl until 1900. Below 500 ft to 1 kft agl after 2100. * Transport Winds.....Variable less than 10 mph until 2400, then southeast 10 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .TUESDAY... * Sky/Weather.........Partly cloudy. * Max Temperature.....75-85 valleys and 63-73 ridges. * Min Humidity........20-30 percent. * 20-Foot Winds....... * Lower Elevation......Calm to becoming south 5-15 mph in the afternoon. * Ridge Top............South 10-20 mph. * Mixing Height.......1-2 kft agl until 1100. 9 kft agl after 1400. * Transport Winds.....Southeast 10 mph until 1200, then southwest 15 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .TUESDAY NIGHT... * Sky/Weather.........Partly cloudy. Rain showers likely and slight chance of thunderstorms. * Min Temperature.....45-50 valleys and 35-40 ridges. * Max Humidity........85-95 percent valleys and 91-100 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 5-10 mph. * Ridge Top............West 10-15 mph. * Mixing Height.......7 kft agl until 1900. Below 500 ft to 1 kft agl after 2100. * Transport Winds.....West 10 mph until 2000, then northwest 10 mph. * Chance Lightning....30 percent. * CWR (> 0.10 Inch)...50 percent over the Palouse/Hells Canyon...and30 percent toward the Clearwater/Nez Perce. .WEDNESDAY... * Sky/Weather.........Rain and snow. Snow level 6000 feet. * Max Temperature.....50-60 valleys and 40-45 ridges. * Min Humidity........69-79 percent. * 20-Foot Winds....... * Lower Elevation......West 5-15 mph. * Ridge Top............West 10-20 mph. * Mixing Height.......3 kft agl. * Transport Winds.....West 15 mph until 1100, then southwest 20 mph. * Chance Lightning....Near 0 percent over the Palouse/Hells Canyon...and 15 percent toward the Clearwater/Nez Perce. * CWR (> 0.10 Inch)...100 percent. .THURSDAY...Mostly cloudy with rain and snow. Chance of precipitation 90 percent. Lows 35-45. Highs 45-55. Min humidities 35-45 percent. West winds 10-15 mph. .FRIDAY...Partly cloudy with chance of rain and snow. Chance of precipitation 50 percent. Lows 30-40. Highs 45-55. Min humidities 30-40 percent. North winds 10-15 mph. .SATURDAY...Partly cloudy with slight chance of snow. Chance of snow 20 percent. Lows 30-40. Highs 50-60. Northeast winds 10-15 mph. .SUNDAY...Partly cloudy. Lows 30-40. Highs 55-65. .MONDAY...Partly cloudy. Lows 35-45. Highs 55-65. $$ MTZ104-105-211000- Kootenai-Flathead/Glacier Park- 202 PM MDT Mon Apr 20 2026 .TONIGHT... * Sky/Weather.........Partly cloudy. * Min Temperature.....40-45. * Max Humidity........64-74 percent valleys and 46-56 percent ridges. * 20-Foot Winds....... * Lower Elevation......Downslope/downvalley 1-3 mph. * Ridge Top............Southwest 5-15 mph. * Mixing Height.......7 kft agl until 1900. Below 500 ft to 1 kft agl after 2000. * Transport Winds.....Southwest 10 mph until 0200, then variable less than 10 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .TUESDAY... * Sky/Weather.........Partly cloudy. * Max Temperature.....80-85 valleys and 60-70 ridges. * Min Humidity........11-17 percent valleys and 25-35 percent ridges. * 20-Foot Winds....... * Lower Elevation......Calm to becoming upslope/upvalley 4-8 mph in the afternoon. * Ridge Top............South 5-15 mph becoming southwest in the afternoon. * Mixing Height.......2 kft agl until 1100. 9 kft agl after 1500. * Transport Winds.....Southeast 10 mph until 1600, then south 15 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .TUESDAY NIGHT... * Sky/Weather.........Partly cloudy. Slight chance of rain. * Min Temperature.....45-50 valleys and 35-45 ridges. * Max Humidity........77-87 percent valleys and 67-77 percent ridges. * 20-Foot Winds....... * Lower Elevation......Downslope/downvalley 1-3 mph. * Ridge Top............Southwest 5-15 mph becoming northwest after midnight. * Mixing Height.......7 kft agl until 1900. Below 500 ft to 1 kft agl after 2100. * Transport Winds.....Southwest 10 mph until 2100. North 10 mph after 0200. * Chance Lightning....15 percent over the Kootenai...and near 0 percent toward the Flathead/Glacier Park. * CWR (> 0.10 Inch)...0 percent. .WEDNESDAY... * Sky/Weather.........Mostly cloudy. Chance of rain in the morning, then rain showers, snow showers and slight chance of thunderstorms in the afternoon. * Max Temperature.....55-65 valleys and 45-50 ridges. * Min Humidity........54-64 percent valleys and 66-76 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 10-15 mph. * Ridge Top............West 10-20 mph. * Mixing Height.......3 kft agl until 1100, then 5 kft agl. * Transport Winds.....Northwest 10 mph until 0900, then west 15 mph. * Chance Lightning....30 percent over the Kootenai...and 25 percent toward the Flathead/Glacier Park. * CWR (> 0.10 Inch)...90 percent. .THURSDAY...Colder. Mostly cloudy with snow and rain.Chance of precipitation 80 percent. Lows 30-40. Highs 40-50. Min humidities 30-40 percent. Northwest winds 10-20 mph. .FRIDAY...Mostly cloudy with chance of snow. Chance of snow 30 percent. Lows 25-35. Highs 40-50. Min humidities 25-35 percent. North winds 10-15 mph. .SATURDAY...Partly cloudy with slight chance of snow. Chance of snow 20 percent. Lows 25-35. Highs 45-55. Northeast winds 10-15 mph. .SUNDAY...Partly cloudy with slight chance of snow. Chance of snow 20 percent. Lows 25-35. Highs 45-55. .MONDAY...Partly cloudy with slight chance of snow. Chance of snow 20 percent. Lows 30-40. Highs 50-60. $$ MTZ106-108-211000- West Lolo-East Lolo- 202 PM MDT Mon Apr 20 2026 .TONIGHT... * Sky/Weather.........Partly cloudy. * Min Temperature.....40-50. * Max Humidity........56-66 percent valleys and 41-51 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 5-10 mph in the evening becoming downslope/downvalley 2-5 mph. * Ridge Top............West 5-15 mph becoming south after midnight. * Mixing Height.......7 kft agl until 1900. Below 500 ft to 1 kft agl after 2000. * Transport Winds.....West 10 mph until 2400, then variable less than 10 mph. * Chance Lightning....Near 0 percent over the West Lolo...and 0 percent toward the East Lolo. * CWR (> 0.10 Inch)...0 percent. .TUESDAY... * Sky/Weather.........Partly cloudy. * Max Temperature.....73-83 valleys and 65-75 ridges. * Min Humidity........10-20 percent valleys and 19-29 percent ridges. * 20-Foot Winds....... * Lower Elevation......Southeast 5-15 mph. * Ridge Top............Southeast 5-15 mph becoming southwest in the afternoon. * Mixing Height.......3 kft agl until 1200. 11 kft agl after 1400. * Transport Winds.....Southeast 10 mph until 1300, then south 20 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .TUESDAY NIGHT... * Sky/Weather.........Partly cloudy. * Min Temperature.....40-45. * Max Humidity........74-84 percent valleys and 66-76 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 5-10 mph. * Ridge Top............West 10-15 mph. * Mixing Height.......8 kft agl until 1900. Below 500 ft to 1 kft agl after 2000. * Transport Winds.....Southwest 15 mph until 2100, then northwest 10 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .WEDNESDAY... * Sky/Weather.........Mostly cloudy. Rain showers and slight chance of thunderstorms. Snow level 7500 feet. * Max Temperature.....50-60 valleys and 43-53 ridges. * Min Humidity........50-60 percent. * 20-Foot Winds....... * Lower Elevation......West 10-20 mph. * Ridge Top............Southwest 5-15 mph increasing to west 15-25 mph in the afternoon. * Mixing Height.......3 kft agl until 0900. 6 kft agl after 1100. * Transport Winds.....Southwest 15 mph until 1100, then 20 mph. * Chance Lightning....20 percent over the West Lolo...and 25 percent toward the East Lolo. * CWR (> 0.10 Inch)...90 percent. .THURSDAY...Colder. Cloudy with snow showers, rain and slight chance of thunderstorms. Chance of precipitation 90 percent. Lows 35-45. Highs 40-50. Min humidities 35-45 percent. West winds 10-20 mph. .FRIDAY...Mostly cloudy with chance of snow. Chance of snow 30 percent. Lows 25-35. Highs 40-50. Min humidities 30-40 percent. North winds 10-15 mph. .SATURDAY...Partly cloudy with slight chance of snow. Chance of snow 20 percent. Lows 25-35. Highs 45-55. Northeast winds 5-10 mph. .SUNDAY...Partly cloudy. Lows 25-35. Highs 45-55. .MONDAY...Partly cloudy. Lows 30-40. Highs 50-60. $$ MTZ107-211000- Flathead Reservation- 202 PM MDT Mon Apr 20 2026 .TONIGHT... * Sky/Weather.........Partly cloudy. * Min Temperature.....40-50. *Max Humidity........56-66 percent valleys and 42-52 percent ridges. * 20-Foot Winds....... * Lower Elevation......South 5-10 mph. * Ridge Top............South 10-20 mph. * Mixing Height.......8 kft agl until 1900. Below 500 ft to 1 kft agl after 2000. * Transport Winds.....South 10 mph until 0100. Variable less than 10 mph after 0500. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .TUESDAY... * Sky/Weather.........Partly cloudy. * Max Temperature.....80-85 valleys and 55-60 ridges. * Min Humidity........7-17 percent valleys and 22-32 percent ridges. * 20-Foot Winds....... * Lower Elevation......Calm to becoming upslope/upvalley 4-8 mph in the afternoon. * Ridge Top............South 10-20 mph becoming west 10-15 mph in the afternoon. * Mixing Height.......3 kft agl until 1200. 8 kft agl after 1500. * Transport Winds.....Southeast 10 mph until 1500, then south 15 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .TUESDAY NIGHT... * Sky/Weather.........Partly cloudy. * Min Temperature.....45-50 valleys and 35-40 ridges. * Max Humidity........70-80 percent valleys and 76-86 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 5-10 mph. * Ridge Top............West 10-15 mph. * Mixing Height.......6 kft agl until 1900. Below 500 ft to 1 kft agl after 2100. * Transport Winds.....Southwest 10 mph until 2000, then northwest 10 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .WEDNESDAY... * Sky/Weather.........Mostly cloudy. Chance of rain in the morning, then rain showers and slight chance of thunderstorms in the afternoon. Snow level 7500 feet. * Max Temperature.....60-65 valleys and 45-50 ridges. * Min Humidity........51-61 percent valleys and 66-76 percent ridges. * 20-Foot Winds....... * Lower Elevation......Calm to becoming 10-15 mph in the afternoon. * Ridge Top............West 5-15 mph increasing to 15-25 mph in the afternoon. * Mixing Height.......2 kft agl until 1000, then 4 kft agl. * Transport Winds.....West 10 mph until 1100, then southwest 15 mph. * Chance Lightning....25 percent. * CWR (> 0.10 Inch)...90 percent. .THURSDAY...Cooler. Cloudy with rain, snow showers and slight chance of thunderstorms. Chance of precipitation 90 percent. Lows 35-45. Highs 45-55. Min humidities 35-45 percent. West winds 10-20 mph. .FRIDAY...Mostly cloudy with chance of rain and slight chance of snow. Chance of precipitation 30 percent. Lows 30-40. Highs 45-55. Min humidities 25-35 percent. North winds 10-15 mph. .SATURDAY...Partly cloudy. Lows 25-35. Highs 50-60. Northeast winds 10-15 mph. .SUNDAY...Partly cloudy. Lows 30-40. Highs 50-60. .MONDAY...Partly cloudy. Lows 30-40. Highs 55-65. $$ MTZ109-211000- Bitterroot- 202 PM MDT Mon Apr 20 2026 .TONIGHT... * Sky/Weather.........Partly cloudy. * Min Temperature.....40-45. * Max Humidity........48-58 percent valleys and 39-49 percent ridges. * 20-Foot Winds....... * Lower Elevation......Downslope/downvalley 2-5 mph. * Ridge Top............South 5-15 mph. * Mixing Height.......6 kft agl until 1900, then 1-2 kft agl. * Transport Winds.....Southwest 10 mph until 2200, then south 10 mph. * Chance Lightning....0 percent. * CWR (> 0.10 Inch)...0 percent. .TUESDAY... * Sky/Weather.........Partly cloudy. * Max Temperature.....80-85 valleys and 60-65 ridges. * Min Humidity........11-20 percent valleys and 19-29 percent ridges. * 20-Foot Winds....... * Lower Elevation......Calm to becoming south 5-15 mph in the afternoon. * Ridge Top............South 10-20 mph. * Mixing Height.......2 kft agl until 1100. 11 kft agl after 1600. * Transport Winds.....South 15 mph until 1300, then 25 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .TUESDAY NIGHT... * Sky/Weather.........Partly cloudy. * Min Temperature.....35-45. * Max Humidity........63-73 percent. * 20-Foot Winds....... * Lower Elevation......South 10-15 mph. * Ridge Top............South 10-15 mph. * Mixing Height.......8 kft agl until 1900. Below 500 ft to 1 kft agl after 2000. * Transport Winds.....South 15 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...10 percent. .WEDNESDAY... * Sky/Weather.........Rain and snow likely in the morning, then rain showers, snow showers and slight chance of thunderstorms in the afternoon. Snow level 7000 feet. * Max Temperature.....60-65 valleys and 40-45 ridges. * Min Humidity........53-63 percent valleys and 64-74 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 10-20 mph. * Ridge Top............Southwest 5-15 mph increasing to west 15-25 mph in the afternoon. * Mixing Height.......3 kft agl until 1000. 6 kft agl after 1200. * Transport Winds.....Southwest 15 mph until 1100, then west 20 mph. * Chance Lightning....20 percent. * CWR (> 0.10 Inch)...90 percent. .THURSDAY...Colder. Cloudy with snow and rain. Chance of precipitation 90 percent. Lows 30-40. Highs 40-50. Min humidities 35-45 percent. West winds 10-20 mph. .FRIDAY...Mostly cloudy with snow likely. Chance of snow 60 percent. Lows 25-35. Highs 40-50. Min humidities 25-35 percent. North winds 10-20 mph. .SATURDAY...Partly cloudy with slight chance of snow. Chance of snow 20 percent. Lows 20-30. Highs 40-50. Northeast winds 10-15 mph. .SUNDAY...Partly cloudy with slight chance of snow. Chance of snow 20 percent. Lows 25-35. Highs 45-55. .MONDAY...Partly cloudy with slight chance of snow. Chance of snow 20 percent. Lows 25-35. Highs 50-60. $$ MTZ110-111-211000- Deerlodge/West Beaverhead-East Beaverhead- 202 PM MDT Mon Apr 20 2026 .TONIGHT... * Sky/Weather.........Partly cloudy. * Min Temperature.....35-45. * Max Humidity........40-50 percent valleys and 31-41 percent ridges. * 20-Foot Winds....... * Lower Elevation......South 10-20 mph. * Ridge Top............South 10-20 mph. * Mixing Height.......12 kft agl until 1900. Below 500 ft to 1 kft agl after 2000. * Transport Winds.....Southwest 15 mph. * Chance Lightning....0 percent over the Deerlodge/West Beaverhead...and near 0 percent toward the East Beaverhead. * CWR (> 0.10 Inch)...0 percent. .TUESDAY... * Sky/Weather.........Partly cloudy. * Max Temperature.....75-80 valleys and 60-70 ridges. * Min Humidity........11-16 percent valleys and 13-23 percent ridges. * 20-Foot Winds....... * Lower Elevation......South 15-25 mph. * Ridge Top............South 20-30 mph. * Mixing Height.......1-2 kft agl until 1000. 11 kft agl after 1400. * Transport Winds.....South 15 mph until 1100. 30 mph after 1300. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .TUESDAY NIGHT... * Sky/Weather.........Partly cloudy. * Min Temperature.....35-45. * Max Humidity........44-54 percent. * 20-Foot Winds....... * Lower Elevation......South 15-25 mph decreasing to 10-15 mph after midnight. * Ridge Top............South 20-30 mph. * Mixing Height.......11 kft agl until 1900. Below 500 ft to 1 kft agl after 2100. * Transport Winds.....South 30 mph until 2000, then 20 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .WEDNESDAY... * Sky/Weather.........Partly cloudy. Chance of rain and snow in the morning, then rain showers, snow showers and slight chance of thunderstorms in the afternoon. Snow level 7000 feet. * Max Temperature.....55-65 valleys and 43-53 ridges. * Min Humidity........30-40 percent valleys and 37-47 percent ridges. * 20-Foot Winds....... * Lower Elevation......Southwest 25-35 mph. * Ridge Top............Southwest 25-35 mph. * Mixing Height.......2 kft agl until 0800, then 5 kft agl until 1000, then 7 kft agl until 1200, then 8 kft agl until 1600, then 7 kft agl. * Transport Winds.....South 20 mph until 0800, then southwest 30 mph until 1700, then west 25 mph. * Chance Lightning....20 percent. * CWR (> 0.10 Inch)...80 percent over the Deerlodge/West Beaverhead...and 50 percent toward the East Beaverhead. .THURSDAY...Colder. Cloudy with snow and rain. Chance of precipitation 90 percent. Lows 30-40. Highs 40-50. Min humidities 40-50 percent. West winds 15-25 mph. .FRIDAY...Mostly cloudy with snow likely. Chance of snow 60 percent. Lows 20-30. Highs 35-45. Min humidities 30-40 percent. North winds 15-25 mph. .SATURDAY...Partly cloudy with slight chance of snow. Chance of snow 20 percent. Lows 15-25. Highs 35-45. Northeast winds 10-15 mph. .SUNDAY...Partly cloudy with slight chance of snow. Chance of snow 20 percent. Lows 20-30. Highs 40-50. .MONDAY...Partly cloudy with slight chance of snow. Chance of snow 20 percent. Lows 25-35. Highs 45-55. $$