Massive mayfly hatch shows up on radar, causes car crash

An annual massive mayfly hatch on the Mississippi is underway in southeastern Minnesota, showing up on radar and causing a serious car accident.

Two experts join The Daily Circuit to explain why these hatches happen, what they mean and the problems they can cause.

Mayfly hatch as seen from Trempealeau on Saturday night from Joshua Hanson. pic.twitter.com/19gN2Ldx37

— Michelle Poedel (@news8michelle) July 21, 2014

@MyLittleBloggie From a friend in LaCrosse #Mayflies pic.twitter.com/SzJvmdH2ZC

— Josh Ruhnke (@ruhnke) July 21, 2014

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