FNUS75 KMSO 202142 FWSMSO Spot Forecast for Grant Creek 16 National Weather Service Missoula MT 342 PM MDT Sun Sep 20 2026 Forecast is based on ignition time of 1800 MDT on September 20. If conditions become unrepresentative...contact the National Weather Service. .DISCUSSION...High pressure will continue to bring warm conditions through the next couple days. Winds will be light and generally terrain driven. Overnight/early morning periods can expect northeast winds shifting to southeast following sunrise. Winds will shift to the west-southwest by early to mid-afternoon, becoming westerly during the early evening timeframe. .TONIGHT... * Sky/Weather.........Clear. * CWR (> 0.10 Inch)...0 percent. * Chance Lightning....0 percent. * Min Temperature.....43-48. * Max Humidity........65-70 percent. * Wind (20 ft)........Northeast 5-8 mph. * Mixing Height.......500 ft agl. * Mixing Winds........Southeast 5 mph. * Precip Amount.......0.00 inches. .MONDAY... * Sky/Weather.........Sunny. * CWR (> 0.10 Inch)...0 percent. * Chance Lightning....0 percent. * Max Temperature.....72-77. * Min Humidity........29-34 percent. * Wind (20 ft)........Southeast 3-6 mph in the morning shifting to west-southwest 4-6 mph in the afternoon. * Mixing Height.......3000 ft agl increasing to 4500 ft agl late in the afternoon. * Mixing Winds........South 5 mph. * Precip Amount.......0.00 inches. .MONDAY NIGHT... * Sky/Weather.........Mostly clear. * CWR (> 0.10 Inch)...0 percent. * Chance Lightning....0 percent. * Min Temperature.....47-52. * Max Humidity........61-66 percent. * Wind (20 ft)........West 3-5 mph becoming northeast 5-6 mph overnight. * Mixing Height.......500 ft agl. * Mixing Winds........Southeast 5 mph. * Precip Amount.......0.00 inches. .TUESDAY... * Sky/Weather.........Partly cloudy. * CWR (> 0.10 Inch)...0 percent. * Chance Lightning....0 percent. * Max Temperature.....71-76. * Min Humidity........32-37 percent. * Wind (20 ft)........Southeast 3-6 mph in the morning becoming west-southwest 3-6 mph in the afternoon. * Mixing Height.......2500 ft agl increasing to 6500 ft agl in the afternoon. * Mixing Winds........South 10 mph. * Precip Amount.......0.00 inches. $$ Forecaster...Lukinbeal Requested by...Jonathan Schmidt Type of request...PRESCRIBED .TAG 2622192.0/MSO .DELDT 09/20/26 .FormatterVersion 2.0.0 .EMAIL jonathan.schmidt@usda.gov