FNUS55 KMSO 192003 FWFMSO Fire Weather Planning Forecast for Wrn Montana and N Cntrl Idaho National Weather Service Missoula MT 202 PM MDT Tue May 19 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, mostly cloudy. A 20 percent chance of rain until midnight. Wednesday, mostly cloudy. A 20 percent chance of showers and thunderstorms in the afternoon. Wednesday Night, mostly cloudy. Chance of rain showers and a slight chance of thunderstorms until midnight, then a chance of rain after midnight. Thursday, mostly sunny. Humidities will be lower. 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, mostly cloudy. A 20 percent chance of rain until midnight. Wednesday, a chance of rain and snow in the morning, then chance of rain showers, thunderstorms and snow showers likely in the afternoon. It'll be cooler. Wednesday Night, mostly cloudy with a chance of rain showers, a chance of snow and a slight chance of thunderstorms until midnight, then mostly clear after midnight. Thursday, mostly sunny. It'll be not as cool. Humidities will be lower. 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, mostly cloudy. A 20 percent chance of rain until midnight. Wednesday, mostly cloudy. Slight chance of rain in the morning, then chance of showers and thunderstorms in the afternoon. Humidities will be higher. Wednesday Night, rain showers likely and a slight chance of thunderstorms until midnight, then a chance of rain and snow after midnight. Thursday, partly cloudy. Humidities will be lower. 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, mostly cloudy. A 20 percent chance of rain and snow showers until midnight. Wednesday, mostly cloudy. A 20 percent chance of showers and thunderstorms in the afternoon. Humidities will be higher. Wednesday Night, chance of rain showers, snow showers and a slight chance of thunderstorms until midnight, then rain and snow likely after midnight. Thursday, mostly cloudy. A 50 percent chance of rain and snow in the morning. IDZ102-103-201000- Palouse/Hells Canyon-Clearwater/Nez Perce- 102 PM PDT Tue May 19 2026 .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......Variable less than 5 mph in the evening becoming downslope/downvalley 1-3 mph. * Ridge Top............West 5-15 mph. * Mixing Height.......6 kft agl until 2000. Below 500 ft to 1 kft agl after 2100. * Transport Winds.....West 10 mph until 0100, 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.....63-73 valleys and 50-60 ridges. * Min Humidity........35-45 percent valleys and 46-56 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. 6 kft agl after 1400. * Transport Winds.....West 10 mph until 1500, then northwest 15 mph. * Chance Lightning....Near 0 percent over the Palouse/Hells Canyon...and 20 percent toward the Clearwater/Nez Perce. * CWR (> 0.10 Inch)...0 percent. .WEDNESDAY NIGHT... * Sky/Weather.........Partly cloudy. Chance of rain showers and slight chance of thunderstorms. Snow level 7500 feet. * Min Temperature.....35-45. * Max Humidity........72-82 percent. * 20-Foot Winds....... * Lower Elevation......Northwest 5-10 mph in the evening becoming downslope/downvalley 2-5 mph. * Ridge Top............Northwest 10-20 mph becoming north 5-10 mph after midnight. * Mixing Height.......5 kft agl until 2000. Below 500 ft to 1 kft agl after 2100. * Transport Winds.....Northwest 15 mph until 2200, then variable less than 10 mph. * Chance Lightning....20 percent over the Palouse/Hells Canyon...and 25 percent toward the Clearwater/Nez Perce. * CWR (> 0.10 Inch)...10 percent. .THURSDAY... * Sky/Weather.........Partly cloudy. * Max Temperature.....68-78 valleys and 55-65 ridges. * Min Humidity........23-33 percent valleys and 29-39 percent ridges. * 20-Foot Winds....... * Lower Elevation......Calm to becoming upslope/upvalley 4-8 mph in the afternoon. * Ridge Top............North 5-15 mph. * Mixing Height.......1-2 kft agl until 0900. 8 kft agl after 1300. * Transport Winds.....Northeast 10 mph until 1700, then north 10 mph. * Chance Lightning....0 percent over the Palouse/Hells Canyon...and near 0 percent toward the Clearwater/Nez Perce. * CWR (> 0.10 Inch)...0 percent. .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. Min humidities 15-25 percent. South winds 10-15 mph. .SUNDAY...Partly cloudy. Lows 45-55. Highs 75-85. Southwest winds 10-15 mph. .MEMORIAL DAY...Cooler. Partly cloudy with slight chance of rain. Chance of rain 20 percent. Lows 45-55. Highs 65-75. .TUESDAY...Cooler. Partly cloudy with chance of rain and snow. Chance of precipitation 30 percent. Lows 40-50. Highs 55-65. $$ MTZ104-105-201000- Kootenai-Flathead/Glacier Park- 202 PM MDT Tue May 19 2026 .TONIGHT... * Sky/Weather.........Partly cloudy. Slight chance of rain. Snow level 7000 feet. * Min Temperature.....30-40. * Max Humidity........92-100 percent valleys and 80-90 percent ridges. * 20-Foot Winds....... * Lower Elevation......Variable less than 5 mph. * Ridge Top............West 10-20 mph. * Mixing Height.......5 kft agl until 2000. Below 500 ft to 1 kft agl after 2200. * Transport Winds.....West 15 mph. * Chance Lightning....15 percent over the Kootenai...and near 0 percent toward the Flathead/Glacier Park. * CWR (> 0.10 Inch)...10 percent. .WEDNESDAY... * Sky/Weather.........Partly cloudy. Chance of rain and snow in the morning. Chance of thunderstorms and snow showers likely in the afternoon. Snow level 6500 feet. * Max Temperature.....60-70 valleys and 45-55 ridges. * Min Humidity........45-55 percent valleys and 64-74 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.......1-2 kft agl until 0900. 7 kft agl after 1300. * Transport Winds.....West 10 mph until 1400, then northwest 15 mph. * Chance Lightning....40 percent. * CWR (> 0.10 Inch)...10 percent over the Kootenai...and 40 percent toward the Flathead/Glacier Park. .WEDNESDAY NIGHT... * Sky/Weather.........Partly cloudy. Chance of rain showers, snow and slight chance of thunderstorms. Snow level 6500 feet. * Min Temperature.....30-40. * Max Humidity........91-100 percent valleys and 77-87 percent ridges. * 20-Foot Winds....... * Lower Elevation......North 5-10 mph. * Ridge Top............North 10-15 mph. * Mixing Height.......5 kft agl until 2000, then below 500 ft to 1 kft agl. * Transport Winds.....North 15 mph until 2300, then northeast 10 mph. * Chance Lightning....20 percent. * CWR (> 0.10 Inch)...20 percent. .THURSDAY... * Sky/Weather.........Partly cloudy. * Max Temperature.....65-75 valleys and 50-60 ridges. * Min Humidity........21-31 percent valleys and 35-45 percent ridges. * 20-Foot Winds....... * Lower Elevation......Calm to becoming upslope/upvalley 4-8 mph in the afternoon. * Ridge Top............Northwest 5-10 mph. * Mixing Height.......1-2 kft agl until 0900. 8 kft agl after 1300. * Transport Winds.....North 10 mph until 1400, then northwest 10 mph. * Chance Lightning....0 percent over the Kootenai...and near 0 percent toward the Flathead/Glacier Park. * CWR (> 0.10 Inch)...0 percent. .FRIDAY...Partly cloudy. Lows 40-50. Highs 60-70. Min humidities 20-30 percent. Southwest winds 10-15 mph. .SATURDAY...Partly cloudy. Lows 40-50. Highs 65-75. Min humidities 20-30 percent. Southwest winds 10-15 mph. .SUNDAY...Partly cloudy. Lows 45-55. Highs 65-75. Southwest winds 15-25 mph. .MEMORIAL DAY...Partly cloudy with slight chance of rain. Chance of rain 20 percent. Lows 45-55. Highs 60-70. .TUESDAY...Partly cloudy with chance of rain and snow. Chance of precipitation 30 percent. Lows 40-50. Highs 55-65. $$ MTZ106-108-201000- West Lolo-East Lolo- 202 PM MDT Tue May 19 2026 .TONIGHT... * Sky/Weather.........Partly cloudy. Slight chance of rain. Snow level 7000 feet. * Min Temperature.....30-40. * Max Humidity........78-88 percent valleys and 72-82 percent ridges. * 20-Foot Winds....... * Lower Elevation......West 10-15 mph in the evening becoming downslope/downvalley 5-10 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)...0 percent. .WEDNESDAY... * Sky/Weather.........Mostly cloudy. Chance of thunderstorms in the afternoon. Snow level 7000 feet. * Max Temperature.....55-65 valleys and 48-58 ridges. * Min Humidity........39-49 percent valleys and 51-61 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. 6 kft agl after 1400. * Transport Winds.....West 15 mph. * Chance Lightning....30 percent. * CWR (> 0.10 Inch)...10 percent. .WEDNESDAY NIGHT... * Sky/Weather.........Partly cloudy. Rain showers likely and slight chance of thunderstorms. Chance of rain and snow after midnight. Snow level 7000 feet. * Min Temperature.....30-40. * Max Humidity........81-91 percent. * 20-Foot Winds....... * Lower Elevation......North 5-10 mph. * Ridge Top............North 5-10 mph. * Mixing Height.......5 kft agl until 2000, then below 500 ft to 1 kft agl. * Transport Winds.....Northwest 15 mph until 2400, then northeast 10 mph. * Chance Lightning....25 percent. * CWR (> 0.10 Inch)...50 percent. .THURSDAY... * Sky/Weather.........Partly cloudy. * Max Temperature.....60-70 valleys and 53-63 ridges. * Min Humidity........21-31 percent valleys and 31-41 percent ridges. * 20-Foot Winds....... * Lower Elevation......Calm to variable less than 7 mph. * Ridge Top............North 5-10 mph becoming northwest in the afternoon. * Mixing Height.......2 kft agl until 0900. 8 kft agl after 1300. * Transport Winds.....North 10 mph until 1700, then northwest 10 mph. * Chance Lightning....0 percent over the West Lolo...and near 0 percent toward the East Lolo. * CWR (> 0.10 Inch)...0 percent. .FRIDAY...Partly cloudy. Lows 40-50. Highs 65-75. Min humidities 15-25 percent. West winds 5-10 mph. .SATURDAY...Partly cloudy. Lows 40-50. Highs 70-80. Min humidities 15-25 percent. Southwest winds 10-15 mph. .SUNDAY...Partly cloudy. Lows 45-55. Highs 70-80. Southwest winds 10-15 mph. .MEMORIAL DAY...Partly cloudy. Lows 45-55. Highs 65-75. .TUESDAY...Cooler. Partly cloudy with chance of rain. Chance of rain 30 percent. Lows 40-50. Highs 55-65. $$ MTZ107-201000- Flathead Reservation- 202 PM MDT Tue May 19 2026 .TONIGHT... * Sky/Weather.........Mostly cloudy. Slight chance of rain. Snow level 7000 feet. * Min Temperature.....35-45. * Max Humidity........69-79 percent valleys and 81-91 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 2200. * Transport Winds.....West 15 mph until 2200, then variable less than 10 mph. * Chance Lightning....15 percent. * CWR (> 0.10 Inch)...10 percent. .WEDNESDAY... * Sky/Weather.........Mostly cloudy. Slight chance of rain in the morning. Chance of thunderstorms in the afternoon. Snow level 7000 feet. * Max Temperature.....65-70 valleys and 40-45 ridges. * Min Humidity........46-56 percent valleys and 63-73 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. 7 kft agl after 1400. * Transport Winds.....West 10 mph until 1400, then northwest 15 mph. * Chance Lightning....40 percent. * CWR (> 0.10 Inch)...40 percent. .WEDNESDAY NIGHT... * Sky/Weather.........Partly cloudy. Rain showers likely and slight chance of thunderstorms. Slight chance of rain after midnight. Snow level 6500 feet. * Min Temperature.....35-40. * Max Humidity........88-92 percent valleys and 94 percent ridges. * 20-Foot Winds....... * Lower Elevation......North 5-10 mph. * Ridge Top............North 5-10 mph. * Mixing Height.......5 kft agl until 1900, then below 500 ft to 1 kft agl. * Transport Winds.....North 10 mph. * Chance Lightning....25 percent. * CWR (> 0.10 Inch)...50 percent. .THURSDAY... * Sky/Weather.........Partly cloudy. * Max Temperature.....65-70 valleys and 45-50 ridges. * Min Humidity........30-40 percent valleys and 38-48 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 1300. * Transport Winds.....North 10 mph. * Chance Lightning....0 percent over areas west of Highway 93...and near 0 percent toward the Mission Mtns and areas east of Highway 93. * CWR (> 0.10 Inch)...0 percent. .FRIDAY...Partly cloudy. Lows 40-50. Highs 65-75. Min humidities 20-30 percent. South winds 5-10 mph. .SATURDAY...Partly cloudy. Lows 45-55. Highs 70-80. Min humidities 20-30 percent. South winds 5-10 mph. .SUNDAY...Partly cloudy. Lows 45-55. Highs 70-80. Southwest winds 10-20 mph. .MEMORIAL DAY...Partly cloudy. Lows 50-60. Highs 70-80. .TUESDAY...Cooler. Partly cloudy with chance of rain. Chance of rain 30 percent. Lows 45-55. Highs 60-70. $$ MTZ109-201000- Bitterroot- 202 PM MDT Tue May 19 2026 .TONIGHT... * Sky/Weather.........Partly cloudy. Slight chance of rain and snow. Snow level 7500 feet. * Min Temperature.....30-40. * Max Humidity........66-76 percent. * 20-Foot Winds....... * Lower Elevation......Northwest 10-15 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 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.....65-70 valleys and 45-50 ridges. * Min Humidity........31-41 percent valleys and 45-55 percent ridges. * 20-Foot Winds....... * Lower Elevation......Calm to becoming northwest 10-15 mph in the afternoon. * Ridge Top............West 5-10 mph increasing to 10-20 mph in the afternoon. * Mixing Height.......1-2 kft agl until 0900. 6 kft agl after 1100. * Transport Winds.....West 10 mph until 1300, then 15 mph. * Chance Lightning....20 percent over the Darby, Sula, and West Fork Districts...and 25 percent toward areas north of Hamilton. * CWR (> 0.10 Inch)...0 percent. .WEDNESDAY NIGHT... * Sky/Weather.........Mostly cloudy. Chance of rain showers, snow showers and slight chance of thunderstorms in the evening, then rain and snow likely after midnight. Snow level 7500 feet. * Min Temperature.....30-40. * Max Humidity........79-89 percent. * 20-Foot Winds....... * Lower Elevation......North 10-15 mph becoming variable less than 5 mph after midnight. * Ridge Top............Northwest 15-25 mph becoming north 5-10 mph after midnight. * Mixing Height.......5 kft agl until 2000. Below 500 ft to 1 kft agl after 2100. * Transport Winds.....Northwest 15 mph until 0100, then north 10 mph. * Chance Lightning....25 percent. * CWR (> 0.10 Inch)...10 percent over the Darby, Sula, and West Fork Districts...and 40 percent toward areas north of Hamilton. .THURSDAY... * Sky/Weather.........Partly cloudy. * Max Temperature.....65-70 valleys and 50-55 ridges. * Min Humidity........20-30 percent valleys and 37-47 percent ridges. * 20-Foot Winds....... * Lower Elevation......Calm to variable less than 7 mph. * Ridge Top............North 5-10 mph. * Mixing Height.......3 kft agl until 1000. 8 kft agl after 1500. * Transport Winds.....North 15 mph. * Chance Lightning....Near 0 percent. * CWR (> 0.10 Inch)...0 percent. .FRIDAY...Partly cloudy. Lows 35-45. Highs 60-70. Min humidities 15-25 percent. Northwest winds 10-15 mph. .SATURDAY...Mostly clear. Lows 40-50. Highs 70-80. Min humidities 10-20 percent. Southwest winds 10-15 mph. .SUNDAY...Partly cloudy. Lows 45-55. Highs 70-80. Southwest winds 10-20 mph. .MEMORIAL DAY...Partly cloudy with slight chance of rain showers and thunderstorms. Chance of precipitation 20 percent. Lows 45-55. Highs 70-80. .TUESDAY...Cooler. Partly cloudy with chance of rain and snow. Chance of precipitation 30 percent. Lows 40-50. Highs 55-65. $$ MTZ110-111-201000- Deerlodge/West Beaverhead-East Beaverhead- 202 PM MDT Tue May 19 2026 .TONIGHT... * Sky/Weather.........Partly cloudy. Slight chance of rain showers and snow showers. Snow level 7000 feet. * Min Temperature.....30-35. * Max Humidity........77-87 percent valleys and 64-74 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.......8 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.........Partly cloudy. Slight chance of thunderstorms in the afternoon. Snow level 7500 feet. * Max Temperature.....55-65 valleys and 45-50 ridges. * Min Humidity........29-39 percent. * 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. 8 kft agl after 1500. * Transport Winds.....West 10 mph until 1200, then 15 mph. * Chance Lightning....25 percent over the Deerlodge/West Beaverhead...and 20 percent toward the East Beaverhead. * CWR (> 0.10 Inch)...10 percent. .WEDNESDAY NIGHT... * Sky/Weather.........Mostly cloudy. Chance of snow showers and slight chance of thunderstorms in the evening. Rain. Snow after midnight. Snow level 7500 feet. * Min Temperature.....30-35. * Max Humidity........89-99 percent valleys and 82-92 percent ridges. * 20-Foot Winds....... * Lower Elevation......North 5-15 mph. * Ridge Top............North 5-15 mph. * Mixing Height.......6 kft agl until 2000. Below 500 ft to 1 kft agl after 2100. * Transport Winds.....North 15 mph. * Chance Lightning....25 percent over the Deerlodge/West Beaverhead...and 20 percent toward the East Beaverhead. * CWR (> 0.10 Inch)...20 percent. .THURSDAY... * Sky/Weather.........Partly cloudy. Chance of snow and rain. Snow level 6500 feet. * Max Temperature.....55-60 valleys and 45-50 ridges. * Min Humidity........25-35 percent valleys and 34-44 percent ridges. * 20-Foot Winds....... * Lower Elevation......North 15-25 mph. * Ridge Top............North 15-25 mph. * Mixing Height.......2 kft agl until 0900. 8 kft agl after 1600. * Transport Winds.....North 15 mph. * Chance Lightning....Near 0 percent over the Deerlodge/West Beaverhead...and 20 percent toward the East Beaverhead. * CWR (> 0.10 Inch)...10 percent. .FRIDAY...Partly cloudy. Lows 30-40. Highs 60-70. Min humidities 15-25 percent. West winds 10-20 mph. .SATURDAY...Partly cloudy. Lows 35-45. Highs 65-75. Min humidities 10-20 percent. Southwest winds 10-15 mph. .SUNDAY...Partly cloudy. Lows 40-50. Highs 70-80. Southwest winds 10-20 mph. .MEMORIAL DAY...Partly cloudy with slight chance of rain showers and thunderstorms. Chance of precipitation 20 percent. Lows 45-55. Highs 70-80. .TUESDAY...Cooler. Partly cloudy with slight chance of rain. Chance of rain 20 percent. Lows 40-50. Highs 60-70. $$