What is even more rare than a tornado doubling back, however, is an anticyclonic tornado. Only 1 per cent of tornadoes that form in the Northern Hemisphere ever spin clockwise, making the April 30 tornado an extremely rare occurrence.

An ultra-rare backward-spinning tornado was spawned Tuesday (April 30) from a powerful supercell thunderstorm that formed over the Oklahoma-Texas border.

A powerful anticyclonic tornado uprooted trees and damaged some buildings on the night of April 30, and a second unusual twister changed direction, doubling back on its path