829 SXUS45 KMSO 311230 RECGPI Recreation Forecast for Flathead Lake National Weather Service Missoula MT 605 AM MDT Fri Jul 31 2020 Note: The experimental wave height forecasts are representative of the mid lake waters and downwind shores. Wave heights may be significantly less on upwind shores. ...HEAT ADVISORY IN EFFECT UNTIL 7 PM MDT SATURDAY... .Today...Sunny. Highs in the upper 80s. Variable winds up to 10 mph. Waves less than 1 foot. .Tonight...Mostly clear. A 20 percent chance of thunderstorms in the evening. Lows in the mid 60s. Variable winds up to 10 mph. Waves less than 1 foot. .SATURDAY...Sunny. A 20 percent chance of thunderstorms in the afternoon. Highs in the upper 80s. Variable winds up to 10 mph. Waves less than 1 foot. .SATURDAY NIGHT...Partly cloudy. Lows in the mid 60s. Variable winds up to 10 mph. Waves less than 1 foot. .SUNDAY...Sunny. Highs in the upper 80s. Variable winds up to 10 mph. Waves less than 1 foot.