DULUTH, Minn. (CBS) -- Below-zero weather is causing a eery effect on Lake Superior.
Take a look at this steam rising from the lake.
You wouldn't expect to see steam rising from the water, but when the weather gets cold enough, like it did today, this is what you get.
Those wisps are called steam devils and they come about when the water temperature is significantly warmer than the air, such as today.
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