Here's video of an impressive waterspout, one of many, that formed over Lake Michigan on Saturday.
(National Weather Service meteorologist Samuel) Shea said the climatological culprit was a big upper level low pressure area that has parked itself over the region, bringing cold air into contact with lake water that has retained the warmth it picked up over the hot summer.
He said the result was "a very unstable lower atmosphere that was just prime weather" for waterspout formation.
"Midwest storms spawn dangerous waterspouts in Lake Michigan"
