A hypercane is a hypothetical class of extreme tropical cyclone that could form if ocean temperatures reached around 50 °C (122 °F), 15 °C higher than the warmest ocean temperature ever recorded— which could in turn be caused by a large asteroid or comet impact, a large volcanic or supervolcanic eruption, or very extensive global warming. There is some speculation that some dinosaurs might have been killed off by a series of hypercanes, resulting from an asteroid or comet crashing into Earth. The term was coined by atmospheric scientist Kerry Emanuel in 1994, at MIT.
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