Massive swarm of mayflies shows up on radar

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June 27, 2019 at 5:18 p.m. UTC

Mayflies invading northern Ohio were picked up on Storm Tracker Doppler 11 Radar Wednesday night.

A green blob could be seen on radar moving across Lake Erie -- but it wasn’t rain.

Instead, what popped up on radar was a swarm of millions of mayflies making their annual journey into Ohio. They deposit themselves from Sandusky over to Cleveland.

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