WASHINGTON (AP) -- The Orionids -- one of two annual meteor showers from Halley's comet -- peak early Monday. A bright waning moon may make them difficult to spot.

The Orionid meteor shower can be unpredictable. It shines like a fireworks display in some years, but is fairly slow in other years.

This highly variable shower may result in anywhere from 20 to 60 visible meteors per hour under ideal viewing conditions, said NASA's Bill Cooke.

This year's peak activity happens on a night when a waning moon is 83% full. The shower lasts through November 22.