The NHC observed wave heights of 83 feet under the northeastern quadrant of Florence.
“These enormous waves are produced by being trapped along with very strong winds moving in the same direction the storm’s motion,” said the NHC.
The storm is still expected to bring life-threatening storm surge across most of the North and South Carolina coastline.
Hurricane and storm surge warnings are in effect for the South Santee River in South Carolina to Duck in North Carolina. Warnings are in effect for Albemarle and Pamlico Sounds, which include the Neuse and Pamlico Rivers.
Hurricane and storm surge watches are in effect from Edisto Beach in South Carolina to the South Santee River in South Carolina. A storm surge watch is in effect at North of Duck in North Carolina to the North Carolina-Virginia border.
Tropical storm warnings were issued for southern Virginia.
Forecast
After hitting land, the storm has been forecast to go west and affect Georgia, eastern Tennessee, and eastern Kentucky.The hurricane center’s projected track showed Florence hovering off the southern North Carolina coast on the night Sept. 13 before finally coming to shore. That trend is “exceptionally bad news,” said University of Miami hurricane researcher Brian McNoldy to AP as it “smears a landfall out over hundreds of miles of coastline, most notably the storm surge.”
As of Sept. 14, some 1.7 million residents in North and South Carolina and Virginia were told to evacuate the coast, and hurricane watches and warnings extended across an area with about 5.4 million residents, AP reported.
Florence was first called Tropical Depression Six by the NHC, forming near the western coast of Africa, on Aug. 31. It was later named Tropical Storm Florence the next day as it moved over the eastern Atlantic Ocean. On Sept. 5, Florence became a Category 4 hurricane after it rapidly intensified over about the span of one day.