FNUS75 KMSO 211158 FWSMSO Spot Forecast for Purple Marten National Weather Service Missoula MT 558 AM MDT Tue Apr 21 2026 Forecast is based on ignition time of 0600 MDT on April 21. If conditions become unrepresentative...contact the National Weather Service. .DISCUSSION...One more day of hot and dry conditions are expected today. Confidence is high MinRH values will run in the low 20s again today. RH values are likely to drop below 25 percent between 1500 and 1900 local. There will be an increase in high- level clouds this afternoon, ahead of the pattern change early tomorrow. There is a small chance (<20%) for isolated showers and thunderstorms this afternoon after 1600, but no wetting rain is expected. More widespread, steady showers arrive Wednesday after 1100 with 24-hour precipitation totals ending Thursday morning ranging between 0.50" and 1.25". .TODAY... * Sky/Weather.........Partly cloudy. * Max Temperature.....76-81. * Min Humidity........20-25 percent. * Wind (20 ft)........Variable 1-3 mph. * Mixing Height.......3000 ft agl increasing to 8000 ft agl. * Mixing Winds........Southeast 10 mph. .TONIGHT... * Sky/Weather.........Partly cloudy. Slight chance of rain showers in the evening. Slight chance of thunderstorms. Chance of rain showers overnight. * Min Temperature.....47-52. * Max Humidity........81-86 percent. * Wind (20 ft)........Variable 1-3 mph. * Mixing Height.......1500 ft agl. * Mixing Winds........West 5 mph. .WEDNESDAY... * Sky/Weather.........Cloudy. Rain showers and slight chance of thunderstorms in the morning, then rain in the afternoon. * Max Temperature.....52-57. * Min Humidity........80-85 percent. * Wind (20 ft)........Variable 2-4 mph becoming southwest around 5 mph in the afternoon. * Mixing Height.......3500 ft agl. * Mixing Winds........West 15 mph. $$ Forecaster...Robinson Requested by...Ryan Winebark Type of request...PRESCRIBED .TAG 2610931.0/MSO .DELDT 04/21/26 .FormatterVersion 2.0.0 .EMAIL ryan.winebark@usda.gov