Hurricane Helene
Western North Carolina, USA · 2024-09-26/2024-09-30
Human context
Helene came ashore in Florida's Big Bend on 26 September 2024 as a Category 4, then funnelled tropical moisture into the southern Appalachians. Asheville and surrounding mountain valleys received over 600 mm of rain in 72 hours, killing more than 250 people and proving that tropical cyclones now kill far from the coast.
250 fatalities · 100,000 displaced · $78 bn in damages
Why it matters
Helene rewrote the working assumption that tropical-cyclone risk is a coastal-zone problem. Asheville, 800 km from landfall and 600 m above sea level, recorded the deadliest hurricane impact in its history because the storm advected Gulf moisture into mountains that lifted it to saturation. For inland communities across the Appalachian and Ozark systems, this means the historical hazard maps based on coastal proximity systematically understate the real flood-frequency exposure under a warming climate.
