Harvey, Irma, Jose, Katia: What's With All the Hurricanes?

Hurricane Harvey struck the US on August 25, 2017 and tore through Texas. Now Hurricane Irma has grown to become one of the most powerful hurricanes on record and is hurtling towards the Caribbean and Florida. Close on her heels is yet another storm, Jose, with a fourth storm, Katia, trailing closely behind. Four storms in two weeks. What's going on? Scientists explain.

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