From WKYC in the greater Cleveland area:

"The Cleveland Museum of Natural History entomologist Gavin Svenson says we could see these periodical cicadas above ground for three to six weeks before they die.

"....He warns that we could see more than a million of cicadas per acre, which is expected to emit a lot of buzz....

"But don't worry, the annoying critters should be gone before the Republican National Convention come July."