Take a look at this weather radar image:
Bad rainstorm, right? Or perhaps snow? No, that image is the result of a gigantic hatch of mayflies:
The bugs were so thick that they showed up as a rainstorm of mayflies on National Weather Service radar.
For about 1 1/2 hours starting at 9 p.m., the insects drifted north, with the radar showing them blanketing areas along the Mississippi River.
“They were dive-bombing in the root beer floats,” said Gary Rudy, owner of Rudy’s Drive-In, whose family has been slinging burgers and soft drinks since 1966.
“It hasn’t been that bad in a long time.”
We get swarms of mayflies in the Detroit area around this time of year as well, mainly in the Downriver areas, and it appears it can get bad enough around these parts for local radar to pick them up as well as shown in this NOAA radar sequence from 2001. Which is just one more reason I’m glad I don’t live in the Downriver area.
Link via Boing Boing.