"THIS is not rain, not ground clutter (the radar beam picking up objects..."

Trillions of cicadas have finally emerged from the ground in Maryland for the first time in 17 years. There appear to be so many of them across the Baltimore–Washington metropolitan area that local radar has detected a giant 'cicada cloud'.

The mass re-emergence of Brood X will only last a month or so as they produce a deafening sound, well over 100 decibels, searching for a mate, making babies, then dying. This only occurs every 17 years.