A possible three tornados wallop Arizona, bringing golf-ball sized hail

Violent storms overnight knocked over utility poles and trees and carried thunder and heavy winds through state

Yet more severe weather struck Thursday in the US south-west as the Four Corners region surveyed blown-away roofs, trees knocked on to homes and power lines downed from overnight tornadoes that injured one person.

The injuries weren't life-threatening but rare for an area better known for scalding heat. But this fall has been unusually soggy in the south-west with El Nino conditions that have sent one tropical system after another in from the Pacific, causing the Grand Canyon and surrounding deserts to rage with floods.