Stormy Weather

Hurricanes, Monsoons, and Tropical Storms

What is the Fujiwhara effect?

Named after Japanese meteorologist Sakuhei Fujiwhara (1884–1950), the Fujiwhara effect is what happens when two hurricanes come close enough to each other that they begin to rotate around a common central point. For this to occur, the two storms generally need to come to within 300 to 900 miles (500 to 1,500 kilometers) of each other; they also need to be of about equal strength to remain in this partnered dance, or else the stronger storm tends to swallow up the smaller storm.


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