A rare event occurred above northern Michigan last week. A roll cloud formed. Last Monday afternoon, according to MLive.com, a roll cloud formed over Lake Michigan, near Charlevoix. Roll clouds are formed when cool air is tumbling down the leading edge of a cold front and sucking warmer air up, where it cools and forms a cloud. A roll cloud is usually not dangerous but is one of the rarest cloud formations.

Here's some more information about the roll cloud that formed up north last Monday.

And here's some video from that event.

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