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Mayflies Invade Wisconsin Town, Cover Everything in Sight

By By Katy Galimberti, AccuWeather.com Staff Writer
July 27, 2014, 5:20:49 AM EDT

A thick, massive band of mayflies traveling along the Mississippi River created a swarm so intense it became visible on National Weather Service radars on July 20, 2014.

Communities in the Upper Midwest experience this alarming phenomenon nearly every year. Mayflies are insects with short life spans that typically emerge in the summer. Typically found near areas of fresh water, the insects hatch in large quantities.

La Crosse, located along the Mississippi River, makes for a prime mayfly habitat. In addition, the northern part of the Mississippi River has more moderate temperatures, creating conditions favorable to the insects.


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After hatching, the bugs began latching onto almost anything on Sunday night, blanketing buildings, cars and gas pumps.


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