By the time that Hurricane Helene made its way hundreds of miles inland on September 27, it had been downgraded to a tropical storm. But Helene remained unusually expansive and strong, fueled by the warm waters in the Gulf of Mexico. The storm brought high winds and catastrophic flooding, knocking out power for more than 2 million Duke Energy customers in the Carolinas, and tearing through a region of the country that wasn’t widely seen as vulnerable to hurricane damage: the Mountain South. Asheville, North Carolina, the city hardest hit, had even appeared on lists of “climate havens” considered comparatively safe from the natural disasters whose impacts are intensified by global warming.