The National Weather Service has issued a wind and wave advisory for Flathead Lake, in effect from noon to 9 p.m.
Meteorologists say to expect west winds of 15-25 mph, gusting to 35 mph, producing wave heights of 2-4 feet.
"Hazardous large waves will impact small watercraft during this time," according to the advisory. "Small boats will be especially prone to capsizing."
The winds are expected to impact all of the Flathead and Mission valleys.