Some of the worst flooding from Helene was in western North Carolina. The full scope of damage in this mountainous area was still difficult to assess on Saturday, as Interstate 40 as well as countless smaller roads were either shut down or washed out, and many residents lacked power and/or cell service. The French Broad River at Asheville crested on Friday afternoon at 24.67 feet, and the Swannanoa River at nearby Biltmore crested at 26.10 feet; both crests topped the respective records of 23.1 and 20.7 feet produced by the destructive Gulf Coast Hurricane of July 1916.

The colossal storm surge and catastrophic rains produced by Helene – as well as Helene’s jaw-dropping rapid intensification prior to landfall – reveal some likely fingerprints of human-caused climate change, as discussed in a Sept. 27 post by Dr. Jeff Masters. Among the records set by Helene:

• Highest storm surge ever measured at three of the six long-term tide gauges along Florida’s west coast. Cedar Key, Clearwater Beach, and St. Petersburg all recorded high-water marks near midnight Thursday night that were roughly 2 to 2.5 feet above all prior marks in data extending back 50 to 110 years.
• Heaviest multiday rainfall on record in Asheville, with 9.89 inches for the period Sept. 26-27 (pre-Helene record 7.94” on Oct. 24-25, 1918) and 13.98” for the period Sept. 25-27 (pre-Helene record 8.49” on Oct. 24-26, 1918). Atlanta had its second wettest three-day span on record, with 11.12” on Sept. 25-27 just behind 11.75” on Dec. 7-9, 1919.