This is a very good post at a good time too. You are correct. Anytime you've got hot warm moist air moving from the south or west and then it rides over cold water you will get that thermal block. That's the reason Michigan sometimes won't work when the temperature difference is too great. Air on Saturday will be damn near 60 and water is still in the high 30*. This is prime for a thermal block when the wind passes over the lake. No matter where you are the wind is going to be gusty since it comes from a low pressure storm. The more south west and the higher in Michigan you go the more that wind travels over the lake, so beware.
To continue the topic: Does the opposite happen in the fall? Slight cold N breeze gets warmed up by the lake to create additional knts?
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