Hurricane Helene, USA, 2024
A Category 4 Florida landfall became an inland flood disaster in the Appalachians, killing at least 250 people.
- Verified
- United States
- 26 September 2024
- Edition of 28 July 2026
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Evidence
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Landfall wind speed
140mph
2 sources
“Hurricane Helene roared ashore late Thursday in Florida’s Big Bend region as a Category 4 hurricane with 140 mph winds.”
Total deaths linked to the storm
250people
2 sources
“That total death toll of at least 250 is the highest for any mainland U.S. tropical cyclone since Hurricane Katrina in 2005.”
Total damage
78.7 billionUS dollars
2 sources
“Helene was America's seventh costliest hurricane on record, according to an estimate from NOAA's National Centers for Environmental Information, responsible for an estimated $78.7 billion in damage.”
Peak rainfall in the southern Appalachians
30inches
2 sources
“Up to 30 inches of rain fell in the Southern Appalachians.”
Customers who lost power
7.4 millioncustomers
2 sources
“Helene's winds knocked out power to an estimated 7.4 million customers in the Southeast, according to an estimate from poweroutage.us.”
Peak storm surge
16feet
2 sources
“Its large wind field pushed a storm surge 12 to 16 feet above ground level into Keaton Beach and Steinhatchee, where about 80 percent of buildings were destroyed.”
Landslides mapped in the Appalachians
2,015landslides
2 sources
“The U.S. Geological Survey mapped 2,015 landslides in the southern Appalachians during Helene, primarily in western North Carolina.”
Hurricane category at landfall
4on the Saffir-Simpson scale
2 sources
“Helene made landfall in the Florida Big Bend region as a category 4 hurricane (on the Saffir-Simpson Hurricane Wind Scale).”
Housing units damaged or destroyed in western North Carolina
125,000housing units
“Media reports indicate that the storm damaged or destroyed more than 125,000 housing units across western North Carolina.”
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Background
Hurricane Helene made landfall in Florida's Big Bend on 26 September 2024 as a Category 4 hurricane with 140 mph winds, the strongest ever recorded on that stretch of coast. Storm surge of up to 16 feet drowned coastal towns, but the worst of Helene came later and far from the sea. The storm was huge and fast moving, and it drew a river of tropical moisture north as it raced inland. Rain had already soaked the southern Appalachians before Helene arrived, and the storm then dropped up to 30 inches more onto steep terrain. Rivers around Asheville, North Carolina broke flood records set in 1916, and surveyors later mapped 2,015 landslides across the mountains. Whole valley communities were cut off as roads, bridges and power lines were destroyed, and about 7.4 million customers lost electricity along the storm's path. At least 250 deaths were linked to Helene, the most for a mainland United States hurricane since Katrina in 2005, and damage reached 78.7 billion dollars, the seventh costliest on record.
Causes
Very warm Gulf water
Helene crossed Gulf of Mexico waters that were much warmer than normal, which let it intensify rapidly to Category 4 strength just before landfall. Warm water is a hurricane's fuel, and the Gulf's record heat in 2024 gave Helene the energy for 140 mph winds and an enormous supply of moisture.
A huge, fast moving storm
Helene was physically large and moved quickly inland, so hurricane force winds and torrential rain reached hundreds of miles from the coast before the storm had time to weaken. Its speed carried tropical moisture deep into Georgia, the Carolinas and Tennessee within hours of landfall, far beyond the usual hurricane zone.
Mountains that squeezed out the rain
As Helene's moisture hit the southern Appalachians, the air was forced to rise, cool and condense, multiplying rainfall on the slopes. Rain before the storm had already saturated the ground, so up to 30 inches of new rain ran straight off into narrow valleys where towns and roads follow the rivers.
Effects
Primary
- Storm surge of up to 16 feet destroyed homes along Florida's Big Bend coast.
- Winds of 140 mph at landfall, with damaging gusts far inland, brought down trees and power lines across six states.
- Record river flooding swept through Asheville and the surrounding valley towns.
- At least 250 deaths were linked to the storm, most of them caused by freshwater flooding.
Secondary
- About 7.4 million customers lost power, some for weeks.
- Surveyors mapped 2,015 landslides in the mountains, many of which destroyed roads and homes.
- Water systems in western North Carolina failed, leaving cities without drinking water for weeks.
- Cut off towns had to be supplied by helicopter and packhorse in the first days.
Social
- Mountain communities with no hurricane experience lost homes, neighbours and whole main streets.
- Hundreds of thousands of people were displaced or left without water, power or phone service.
- Valley towns where the water rose within minutes were left with lasting trauma.
Economic
- Total damage reached 78.7 billion dollars, the seventh costliest United States hurricane on record.
- Asheville's tourism economy lost its autumn season, normally its busiest.
- Farms and timber plantations across Georgia and the Carolinas took heavy losses.
- Rebuilding mountain roads and bridges was expected to take years.
Environmental
- 2,015 landslides scarred the slopes of the southern Appalachians.
- Rivers were choked with sediment, debris and pollution from flooded towns.
- Millions of trees were snapped or uprooted along a path from Florida to Virginia.
Responses
Immediate
- Large scale evacuations were ordered along Florida's Gulf coast before landfall.
- Helicopters rescued people from rooftops in flooded Appalachian valleys.
- Federal emergency teams, the National Guard and utility crews from across the country moved in.
- Emergency water and supplies were trucked and airlifted into cut off mountain towns.
Long term
- Billions of dollars in federal aid funded the rebuilding of homes, roads and water systems.
- Asheville repaired its water network and reopened to visitors over the following year.
- The National Hurricane Center's final report re-examined the storm to improve inland flood warnings.
- The disaster pushed inland flood risk up the agenda for planning and insurance across the region.
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