Fujiwhara

The Fujiwhara effect is a rare phenomenon that sees nearby cyclones ‘dancing’ round each other. In July it was seen not once, but twice*: Hurricanes Hilary and Irwin rotated round each other in the Eastern Pacific Ocean off the coast of Mexico generating high surf for Southern California; whilst thousands of miles away in the western Pacific east of Japan just days earlier, Typhoon Noru and Tropical Storm Kulap spun round each other*.