Hurricane Helene increased in intensity from an area of scattered thunderstorms and rain to a category 4 hurricane in a little more than two days. The storm was supercharged by abnormally warm waters in the Caribbean Sea and Gulf of Mexico. At the time of Helene’s passage, the temperature of the Gulf measured more than 84 °F (28 °C), nearly 1.8 °F (1 °C) warmer than the 2003–14 mean.
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