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Radar captures mayfly swarm on Mississippi River

Published on NewsOK Modified: July 25, 2014 at 12:57 pm •  Published: July 25, 2014
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MILWAUKEE (AP) — Mayflies have begun hatching in the Mississippi River, emerging from the water in swarms that show up on radar like thunderstorms, coat roads and other surfaces and leave behind a slimy mess.

The National Weather Service in La Crosse captured a massive swarm on radar Sunday night as flies emerged from the river to mate and drifted north with the wind.

The radar loop shows yellow spots directly over the river as the flies emerge from the water. The swarm morphs into a green band as it drifts north, and blue dots as the flies disperse.

A second, smaller swarm recorded Thursday night appears as a green band that explodes like fireworks into blue dots.

National Weather Service spokesman Dan Baumgardt says the radar captures energy reflecting off the bugs.


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