FNUS55 KMSO 190702 FWFMSO Fire Weather Planning Forecast for Wrn Montana and N Cntrl Idaho National Weather Service Missoula MT 102 AM MDT Tue May 19 2026 .DISCUSSION... Idaho (Zones 102 and 103): High pressure will dominate and produce gradual warming through the end of the week. Wednesday portions of the Clearwater Mountains along the MT border will see isolated shower activity. Probability of a wetting rain is very low, less than 10%. Northwest MT (Zones 104 and 105): Isolated showers today could potentially become scattered on Wednesday. From the Whitefish Range, south through the Flathead and Mission Valleys, and east to the Continental Divide have a 50-60% chance of a wetting rain Wednesday. West Central MT (Zones 106, 107 and 108): Isolated showers today give way to scattered showers on Wednesday, mainly mountains in the vicinity of and north of I-90. A wetting rain is low probability for most, except the higher terrain along and north of I-90 where there is a 40-50% chance Wednesday, with portions of zone 107 having a 60% chance. Southwest MT (Zones 109, 110 and 111): A warming trend is expected through the end of the week. Less than a 15% chance of showers today, increases to 30% on Wednesday. A wetting rain is 10% or less probable either day. IDZ102-103-200715- Palouse/Hells Canyon-Clearwater/Nez Perce- 1202 AM PDT Tue May 19 2026 .TODAY... * Sky/Weather.........Partly cloudy. Widespread frost in the morning. Snow level 6500 feet. * Max Temperature.....63-73 valleys and 50-60 ridges. * Min Humidity........31-41 percent. * 20-Foot Winds....... * Lower Elevation......Calm to becoming upslope/upvalley 4-8 mph in the afternoon. * Ridge Top............West 5-15 mph. * Mixing Height.......Below 500 ft to 1 kft agl until 0900. 7 kft agl after 1200. * Transport Winds.....Variable less than 10 mph until 1000, then west 10 mph until 1500, then 15 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .TONIGHT... * Sky/Weather.........Partly cloudy. Slight chance of rain. Snow level 7500 feet. * Min Temperature.....35-45. * Max Humidity........64-74 percent. * 20-Foot Winds....... * Lower Elevation......West 5-10 mph in the evening becoming downslope/downvalley 2-5 mph. * Ridge Top............West 10-15 mph decreasing to up to 5 mph after midnight. * Mixing Height.......5 kft agl until 2000, then below 500 ft to 1 kft agl. * Transport Winds.....West 15 mph until 2100, then variable less than 10 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .WEDNESDAY... * Sky/Weather.........Partly cloudy. Slight chance of thunderstorms in the afternoon. Snow level 7500 feet. * Max Temperature.....65-75 valleys and 50-60 ridges. * Min Humidity........33-43 percent valleys and 43-53 percent ridges. * 20-Foot Winds....... * Lower Elevation......Calm to becoming upslope/upvalley 4-8 mph in the afternoon. * Ridge Top............West 5-15 mph. * Mixing Height.......Below 500 ft to 1 kft agl until 0900. 7 kft agl after 1300. * Transport Winds.....West 10 mph until 1400, then northwest 15 mph. * Chance Lightning....Near 0 percent over the Palouse/Hells Canyon...and 15 percent toward the Clearwater/Nez Perce. * CWR (> 0.10 Inch)...10 percent. .THURSDAY...Partly cloudy with chance of rain. Chance of rain 30 percent. Lows 40-50. Highs 65-75. Min humidities 20-30 percent. North winds 10-15 mph. .FRIDAY...Partly cloudy. Lows 40-50. Highs 65-75. Min humidities 20-30 percent. Northwest winds 10-15 mph. .SATURDAY...Mostly clear. Lows 45-55. Highs 70-80. South winds 10-15 mph. .SUNDAY...Partly cloudy. Lows 45-55. Highs 70-80. .MEMORIAL DAY...Partly cloudy. Lows 45-55. Highs 65-75. $$MTZ104-105-200715- Kootenai-Flathead/Glacier Park- 102 AM MDT Tue May 19 2026 .TODAY... * Sky/Weather.........Partly cloudy. Widespread frost in the morning. Slight chance of thunderstorms in the afternoon. Snow level 6500 feet. * Max Temperature.....60-70 valleys and 45-55 ridges. * Min Humidity........37-47 percent valleys and 56-66 percent ridges. * 20-Foot Winds....... * Lower Elevation......Southwest 10-15 mph. * Ridge Top............Southwest 10-20 mph. * Mixing Height.......Below 500 ft to 1 kft agl until 0900. 7 kft agl after 1500. * Transport Winds.....West 15 mph. * Chance Lightning....25 percent. * CWR (> 0.10 Inch)...10 percent. .TONIGHT... * Sky/Weather.........Mostly cloudy. Chance of rain. Snow level 7000 feet. * Min Temperature.....30-40. * Max Humidity........92-100 percent valleys and 79-89 percent ridges. * 20-Foot Winds....... * Lower Elevation......Variable less than 5 mph in the evening becoming downslope/downvalley 1-3 mph. * Ridge Top............West 10-20 mph. * Mixing Height.......5 kft agl until 2000. Below 500 ft to 1 kft agl after 2100. * Transport Winds.....West 15 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...10 percent. .WEDNESDAY... * Sky/Weather.........Mostly cloudy. Chance of rain and snow in the morning. Chance of thunderstorms and snow showers likely in the afternoon. Snow level 7000 feet. * Max Temperature.....60-70 valleys and 45-55 ridges. * Min Humidity........40-50 percent valleys and 62-72 percent ridges. * 20-Foot Winds....... * Lower Elevation......Calm to becoming upslope/upvalley 4-8 mph in the afternoon. * Ridge Top............Northwest 5-15 mph. * Mixing Height.......1-2 kft agl until 0900. 7 kft agl after 1400. * Transport Winds.....Northwest 15 mph. * Chance Lightning....30 percent. * CWR (> 0.10 Inch)...20 percent over the Kootenai...and 60 percent toward the Flathead/Glacier Park. .THURSDAY...Partly cloudy with chance of rain. Chance of rain 30 percent. Lows 35-45. Highs 60-70. Min humidities 20-30 percent. North winds 5-10 mph. .FRIDAY...Partly cloudy. Lows 40-50. Highs 60-70. Min humidities 25-35 percent. Southwest winds 10-15 mph. .SATURDAY...Partly cloudy. Lows 45-55. Highs 65-75. Southwest winds 10-20 mph. .SUNDAY...Partly cloudy. Lows 45-55. Highs 65-75. .MEMORIAL DAY...Partly cloudy. Lows 45-55. Highs 60-70. $$ MTZ106-108-200715- West Lolo-East Lolo- 102 AM MDT Tue May 19 2026 .TODAY... * Sky/Weather.........Partly cloudy. Widespread frost in the morning. Slight chance of thunderstorms in the afternoon. Snow level 6500 feet. * Max Temperature.....55-65 valleys and 48-58 ridges. * Min Humidity........29-39 percent valleys and 43-53 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 5-15 mph. * Ridge Top............West 10-20 mph. * Mixing Height.......Below 500 ft to 1 kft agl until 0900. 7 kft agl after 1100. * Transport Winds.....Southwest 10 mph until 1000, then west 15 mph. * Chance Lightning....20 percent. * CWR (> 0.10 Inch)...10 percent. .TONIGHT... * Sky/Weather.........Partly cloudy. Slight chance of rain. Snow level 7000 feet. * Min Temperature.....30-40. * Max Humidity........79-89 percent valleys and 72-82 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 10-15 mph. * Ridge Top............West 10-15 mph. * Mixing Height.......5 kft agl until 2000. Below 500 ft to 1 kft agl after 2100. * Transport Winds.....West 15 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .WEDNESDAY... * Sky/Weather.........Mostly cloudy. Chance of rain in the morning. Slight chance of thunderstorms in the afternoon. Snow level 7000 feet. * Max Temperature.....60-70 valleys and 50-60 ridges. * Min Humidity........36-46 percent valleys and 46-56 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 5-15 mph. * Ridge Top............West 5-15 mph. * Mixing Height.......1-2 kft agl until 0900. 8 kft agl after 1300. * Transport Winds.....West 15 mph. * Chance Lightning....20 percent over the West Lolo...and 25 percent toward the East Lolo. * CWR (> 0.10 Inch)...20 percent. .THURSDAY...Partly cloudy with chance of rain. Chance of rain 50 percent. Lows 35-45. Highs 60-70. Min humidities 20-30 percent. North winds 10-15 mph. .FRIDAY...Partly cloudy. Lows 40-50. Highs 65-75. Min humidities 20-30 percent. West winds 5-10 mph. .SATURDAY...Partly cloudy. Lows 40-50. Highs 65-75. Southwest winds 10-15 mph. .SUNDAY...Partly cloudy. Lows 45-55. Highs 70-80. .MEMORIAL DAY...Partly cloudy. Lows 45-55. Highs 65-75. $$ MTZ107-200715- Flathead Reservation- 102 AM MDT Tue May 19 2026 .TODAY... * Sky/Weather.........Mostly cloudy. Slight chance of thunderstorms in the afternoon. Snow level 6500 feet. * Max Temperature.....65-70 valleys and 45-50 ridges. * Min Humidity........35-45 percent valleys and 52-62 percent ridges. * 20-Foot Winds....... * Lower Elevation......Southwest 5-15 mph. * Ridge Top............Southwest 10-20 mph. * Mixing Height.......Below 500 ft to 1 kft agl until 0900. 7 kft agl after 1200. * Transport Winds.....Southwest 10 mph until 1200, then west 15 mph. * Chance Lightning....25 percent. * CWR (> 0.10 Inch)...10 percent. .TONIGHT... * Sky/Weather.........Mostly cloudy. Slight chance of rain. Snow level 7000 feet. * Min Temperature.....35-45. * Max Humidity........70-80 percent valleys and 80-90 percent ridges. * 20-Foot Winds....... * Lower Elevation......Southwest 10-15 mph. * Ridge Top............Southwest 10-15 mph. * Mixing Height.......5 kft agl until 2000. Below 500 ft to 1 kft agl after 2100. * Transport Winds.....Southwest 15 mph until 0500, then variable less than 10 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...10 percent. .WEDNESDAY... * Sky/Weather.........Mostly cloudy. Slight chance of rain in the morning. Slight chance of thunderstorms in the afternoon. Snow level 7000 feet. * Max Temperature.....65-70 valleys and 40-45 ridges. * Min Humidity........44-54 percent valleys and 60-70 percent ridges. * 20-Foot Winds....... * Lower Elevation......Calm to variable less than 7 mph. * Ridge Top............West 5-15 mph. * Mixing Height.......Below 500 ft to 1 kft agl until 0900, then 4 kft agl until 1100, then 6 kft agl until 1300, then 7 kft agl until 1700, then 5 kft agl. * Transport Winds.....West 10 mph until 1100, then northwest 10 mph. * Chance Lightning....30 percent. * CWR (> 0.10 Inch)...50 percent. .THURSDAY...Partly cloudy with rain likely. Chance of rain 70 percent. Lows 40-50. Highs 60-70. Min humidities 25-35 percent. North winds 10-15 mph. .FRIDAY...Partly cloudy. Lows 40-50. Highs 65-75. Min humidities 20-30 percent. Southwest winds 5-10 mph. .SATURDAY...Partly cloudy. Lows 45-55. Highs 70-80. Southwest winds 10-20 mph. .SUNDAY...Partly cloudy. Lows 45-55. Highs 70-80. .MEMORIAL DAY...Partly cloudy. Lows 45-55. Highs 65-75. $$ MTZ109-200715- Bitterroot- 102 AM MDT Tue May 19 2026 .TODAY... * Sky/Weather.........Partly cloudy. Slight chance of snow in the afternoon. Snow level 6500 feet. * Max Temperature.....65-70 valleys and 45-50 ridges. * Min Humidity........21-31 percent valleys and 33-43 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 5-15 mph. * Ridge Top............West 5-15 mph. * Mixing Height.......Below 500 ft to 1 kft agl until 0900. 9 kft agl after 1300. * Transport Winds.....West 10 mph until 1500, then 15 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...10 percent. .TONIGHT... * Sky/Weather.........Partly cloudy. Slight chance of rain and snow. Snow level 7000 feet. * Min Temperature.....30-40. * Max Humidity........64-74 percent. * 20-Foot Winds....... * Lower Elevation......Northwest 5-10 mph becoming variable less than 5 mph after midnight. * Ridge Top............West 10-20 mph decreasing to 5-10 mph after midnight. * Mixing Height.......5 kft agl until 2000. Below 500 ft to 1 kft agl after 2300. * Transport Winds.....West 15 mph until 2200, then variable less than 10 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...10 percent. .WEDNESDAY... * Sky/Weather.........Mostly cloudy. Slight chance of thunderstorms in the afternoon. Snow level 7500 feet. * Max Temperature.....65-70 valleys and 45-50 ridges. * Min Humidity........29-39 percent valleys and 44-54 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 5-15 mph. * Ridge Top............West 5-10 mph increasing to 10-20 mph in the afternoon. * Mixing Height.......1-2 kft agl until 0900, then 5 kft agl until 1100, then 7 kft agl until 1300, then 9 kft agl until 1700, then 7 kft agl. * Transport Winds.....West 10 mph until 1200, then northwest 15 mph. * Chance Lightning....20 percent. * CWR (> 0.10 Inch)...10 percent. .THURSDAY...Partly cloudy with chance of rain and snow. Chance of precipitation 50 percent. Lows 35-45. Highs 55-65. Min humidities 15-25 percent. Northwest winds 10-20 mph. .FRIDAY...Partly cloudy. Lows 40-50. Highs 60-70. Min humidities 15-25 percent. Northwest winds 10-15 mph. .SATURDAY...Mostly clear. Lows 40-50. Highs 65-75. Southwest winds 10-20 mph. .SUNDAY...Partly cloudy. Lows 45-55. Highs 70-80. .MEMORIAL DAY...Partly cloudy. Lows 45-55. Highs 65-75. $$ MTZ110-111-200715- Deerlodge/West Beaverhead-East Beaverhead- 102 AM MDT Tue May 19 2026 .TODAY... * Sky/Weather.........Partly cloudy. Slight chance of snow in the afternoon. Snow level 6500 feet. * Max Temperature.....55-65 valleys and 45-50 ridges. * Min Humidity........15-25 percent valleys and 22-32 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 5-15 mph. * Ridge Top............West 5-15 mph. * Mixing Height.......Below 500 ft to 1 kft agl until 0800. 10 kft agl after 1200. * Transport Winds.....West 10 mph until 1500, then 15 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...10 percent. .TONIGHT... * Sky/Weather.........Partly cloudy. Slight chance of rain and snow. Snow level 7000 feet. * Min Temperature.....30-35. * Max Humidity........73-83 percent valleys and 61-71 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 10-15 mph becoming variable less than 5 mph after midnight. * Ridge Top............West 5-15 mph. * Mixing Height.......9 kft agl until 1900. Below 500 ft to 1 kft agl after 2100. * Transport Winds.....West 15 mph until 2200, then variable less than 10 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...10 percent. .WEDNESDAY... * Sky/Weather.........Mostly cloudy. Slight chance of thunderstorms in the afternoon. Snow level 7500 feet. * Max Temperature.....55-65 valleys and 50-55 ridges. * Min Humidity........24-34 percent valleys and 31-41 percent ridges. * 20-Foot Winds....... * Lower Elevation......Calm to becoming west 5-15 mph in the afternoon. * Ridge Top............West 5-15 mph. * Mixing Height.......Below 500 ft to 1 kft agl until 0800. 9 kft agl after 1300. *Transport Winds.....West 10 mph until 1000, then 15 mph. * Chance Lightning....20 percent. * CWR (> 0.10 Inch)...10 percent. .THURSDAY...Mostly cloudy with rain likely and chance of snow. Chance of precipitation 70 percent. Lows 35-45. Highs 55-65. Min humidities 20-30 percent. North winds 15-25 mph. .FRIDAY...Partly cloudy. Lows 35-45. Highs 60-70. Min humidities 15-25 percent. Northwest winds 10-15 mph. .SATURDAY...Partly cloudy. Lows 35-45. Highs 65-75. Southwest winds 10-20 mph. .SUNDAY...Partly cloudy. Lows 40-50. Highs 70-80. .MEMORIAL DAY...Partly cloudy. Lows 45-55. Highs 70-80. $$