Lake generates its own weather
Though not to the same extent as the summit of Mt. Washington, Lake Winni has its own weather. There are many times (esp. in the last week) that my wind sensors (which are on land, about 100 feet from the water) measure 7-10 mph winds as you describe, while out on the open water I can tell by looking at the waves that the wind is hauling along at a much faster rate. Water doesn't slow wind down but Land does.
Also amplifying the wind speed on Lake Winni are local land features (mountains and islands) which sometimes funnel the wind like city buildings do. The lake itself is oriented NW-SE, so winds from either of those 2 directions have a good 15-20 mile run for picking up speed. The last few days it's been blowing from the NW. In summer it's more normal for us to get winds from the SW where all the heat comes from... but this year we keep getting the Montreal Express.
...And the lake water temp here continues its plummet, now at 61. Can't remember ever seeing water this cold in July.
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