It’s that time of year again!

Mayflies are beginning to hatch and emerge from the depths of Lake Erie.

Swarms of the pesky insect were dense enough overnight to be detected on weather radar over the lake.

The chief meteorologist for 19 News affiliate WTVG in Toledo shared a radar image on social media from late Tuesday night.

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

To see the original report and read related stories, follow this link to the Cleveland 19 News website.