Hurricane Florence is now generating waves up to 83 feet, almost double the height measured on Tuesday.
It is very important to point out that changes in the forecast track are still possible and even small changes in the storm could greatly change the expected conditions in your area.
Florence's expanse has even captured the attention of the astronauts and cosmonauts aboard the International Space Station, who have been tweeting pictures of the storm back to Earth.
This enhanced satellite image shows Hurricane Florence off the eastern coast of the United States on Wednesday.
Hurricane Florence's rainfall now lurks just over 100 miles off the coast of the Carolinas and time is running out to prepare.
As of 8 p.m., the storm was centered 335 miles (540 kilometers) southeast of Wilmington, North Carolina, moving northwest at 16 mph (26 kph). However, experts remained unsure midday Wednesday where the storm would make landfall in the Carolinas.
More than a million coastal residents of SC were ordered by Gov. Henry McMaster to evacuate starting at noon Tuesday ahead of Hurricane Florence.
Across the Piedmont, Charlotte could see around five to 10 inches of rain.
"We can not stress this enough, Florence poses a very serious threat to people who live far away from the coast", said a National Weather Service tweet late Tuesday. "Heavy and long-lasting rainfall could lead to catastrophic flooding in inland parts of North Carolina, South Carolina and Virginia".
The Port of Virginia in Hampton Roads was closed Wednesday but planned to reopen Thursday on news that Florence had veered south.
That is causing the so called "cone of uncertainty" to expand.
Industrial waste, including toxic ash from power plants, could also be spread by flooding from the massive storm, which has caused mandatory evacuations of coastal areas in both Carolinas and Virginia, the AP reports.
Hurricane Florence's leading edge battered the Carolina coast Thursday, bending trees and shooting frothy sea water over streets on the Outer Banks, as the hulking storm closed in with 90 miles per hour (135 kph) winds for a drenching siege that could last all weekend. But authorities warned it will still be an extremely risky hurricane.
And in the path of where Florence is expected to make landfall, Gordon Reddick - also a hurricane veteran of Bertha, Fran, Bonnie, Hanna - believes he can wait out yet another storm.
Amazing, yet terrifying video from a plane flying into the eye of Hurricane Florence, takes a look inside the Category 4 storm that's barreling towards the US East Coast.
Florence is now churning through the Atlantic, only a few hundred miles off the coast of Wilmington, N.C.
From North Myrtle Beach to Cape Fear, and Cape Lookout to the Ocracoke Inlet, water could rise 6-9 feet.
With South Carolina's beach towns now more in the bull's-eye because of the shifting forecast, OH vacationers Chris and Nicole Roland put off their departure from North Myrtle Beach to get the maximum amount of time on the sand.
All that water is worrisome for a region that just had a rainy season, meaning the soil there is fairly saturated and the rivers there are already high.