SHERWOOD, Wis. (WLUK) -- Keep your mouth closed and your windows up if you're in the Lake Winnebago area this week.
The annual lake fly hatch has sent swarms of the bugs into the air.
The hatch was even captured on FOX 11 weather radar Wednesday morning, as the northeastern part of the lake was infested.
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While the flies make a mess, the good news is they don't bite. The flies only live for a few days, mating and laying eggs before they die.
The lake flies are an important part of Lake Winnebago's ecosystem, with sturgeon feasting on the larvae.
The lake fly hatch has also been a topic on social media: