Swarms of mayflies invade Cleveland, show up on weather radar

Swarms of mayflies invade Cleveland, show up on weather radar

CLEVELAND, OH (WOIO) - The mayflies have returned!

Swarms of the pests have migrated from Lake Erie and moved into Northeast Ohio overnight. The swarms were so dense overnight, they were caught on weather radar.

Depending on the region, mayflies are known by many names: Canadian soldiers, shadfly, fishfly, up-winged flies. But everyone can agree that they are annoying.

As menacing as mayflies are, they are completely harmless. They tend to congregate under bright lights and rest on the pavement or stuck to the side of cars.

Mayflies vary in size and can be measured anywhere from a quarter of an inch to over an inch.

Surprisingly, mayflies come from the depths of Lake Erie, starting as an egg and hatching to a nymph burrowed into lake sediment. The nymph continues to grow larger until the skin molts, showing off a pair of ready-to-fly wings.

The mayflies do not stick around for long. After emerging from Lake Erie, the mayfly's winged-stage typically lasts up to two days before the pests die.

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