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I use WINDY and it seems accurate for my area.
Personally, I rely on the National Weather Service Recreational Forecast for Champlain weather. https://www.weather.gov/btv/recreation It show's you the forecast for an area off of Colchester Point, but if you click on the Lake Point Forecasts map, then you can click on your area of interest and it will give you a full forecast and a nice hourly wind and wave graph. The Graphical Lake forecast is also helpful in the summer for seeing wave heights throughout the lake.