News Main Animals Archaeology Dinosaurs Earth History Human Animal Space Tech   Brian Bill/NOAA |   Updrafts + Rain = Tornado A tornado touches down near a cornfield in Eureka, Ill. Scientists have long known that rain in a tornado swirls into a hook shape. The feature, called a 'hook echo' quickly became known as a tell-tale radar marker for a tornado. But the swirling rain was regarded as a by-product of a tornado, merely the effect of its powerful corkscrewing winds. New research suggests the opposite may be true.   « back to article

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