Mayflies All Over in Upper Midwest

July 28, 2014 5:33 AM

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Mayflies have begun emerging from Mississippi River, so much so that their swamp has even been captured on the radar, as if it was some thunderstorms approaching.

Dan Baumgardt, a science and operations officer for the National Weather Service in La Crosse, Wisconsin said, "Almost every night in the summer, there's some sense on the radar that there's something coming off the river".

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