It has been frigid on Mackinac this week - we're talking close-to-zero-single-digit-temperatures. When the air is significantly colder than the water, it causes the lake to "steam." Technically, it isn't really steam, it's fog. It happens when when 20ish degree warmer water evaporates and then quickly condenses in the much colder air. The misty fog looks like steam coming off the lake. Either way, the lake is giving up energy and cooling. Local lore on Mackinac says the lake has to steam seven times before we can get an ice bridge.
I think this was steam number three.
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