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North Carolina officials say parts of the state could experience a once-in-a-millennia flood as Hurricane Florence dumps rain for days to come.
Gov. Roy Cooper said Friday that Florence is "wreaking havoc" and he's concerned "whole communities" could be wiped away.
He said parts of the state have seen storm surges as high as 10 feet.
Transportation Secretary Jim Trogdon said the state is expecting 1,000-year "flood events" in areas between Wilmington and Charlotte.
Cooper said the state hasn't seen any Florence-related fatalities so far, but he's concerned about people's safety as the storm continues.
More than 60 people had to be pulled from a collapsing motel at the height of the storm, and many more who defied evacuation orders were hoping to be rescued. Pieces of buildings ripped apart by the storm flew through the air.
Most ominously, forecasters said the terrifying onslaught would last for hours and hours, because Florence was barely creeping along and still drawing energy from the ocean.
Florence made landfall as a Category 1 hurricane at 7:15 a.m. at Wrightsville Beach, a few miles east of Wilmington, as the center of its eye moved onshore, the National Hurricane Center said.
Coastal streets flowed with frothy ocean water, and more than 415,000 homes and businesses were without power, mostly in North Carolina, according to poweroutage.us, which tracks the nation's electrical grid.
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Forecasters said "catastrophic" freshwater flooding was expected along waterways far from the coast of the Carolinas.
Florence's fiercest winds will linger around the coast for hours since the storm was moving forward at only 6 mph (9 kph). Hurricane-force winds extended 80 miles (130 kilometers) from its center, and tropical-storm-force winds reached out to 195 miles (315 kilometers).
Winds bent trees toward the ground and raindrops flew sideways as Florence moved in for an extended stay, with enough of its killer winds swirling overseas to maintain its power. Forecasters said the onslaught could last for days, leaving a wide area under water from both heavy downpours and rising seas.
The wind howled and sheets of rain splattered against windows of a hotel before dawn in Wilmington, where Sandie Orsa of Wilmington sat in a lobby lit by emergency lights after the power failed.
"(It's) very eerie, the wind howling, the rain blowing sideways, debris flying," said Orsa, who lives nearby and fears splintering trees will pummel her house.
PHOTOS: Traffic jams and boarded windows as Southeast braces for storm
The storm's maximum sustained winds held at about 90 mph (144 kph), and it appeared that the north side of the eye was the most dangerous place to be as Florence moved ashore. A gust of 105 mph (169 kph) was recorded at Wilmington airport, surpassing the power of Hurricane Fran two decades ago.
The National Hurricane Center said a gauge in Emerald Isle, North Carolina, reported 6.3 feet (1.92 meters) of inundation. Emerald Isle is about 84 miles 135 kilometers) north of Wilmington.
And about 46 miles farther up the waterfront, in New Bern, about 150 people were waiting to be rescued from floods on the Neuse River, WXII-TV reported. The city said two FEMA teams were working on swift-water rescues and more were on the way.
The worst of the storm's fury had yet to reach coastal South Carolina, where emergency managers said people could still leave flood-prone areas.
"There is still time, but not a lot of time," said Derrec Becker of the South Carolina Department of Emergency Management.
More than 4000,000 people in North Carolina are without power as the storm buffeting the coast.
North Carolina corrections officials said more than 3,000 people were relocated from adult prisons and juvenile centers in the path of Florence, and more than 300 county prisoners were transferred to state facilities.
Officials said some 1.7 million people in the Carolinas and Virginia were warned to evacuate, but it's unclear how many did. The homes of about 10 million were under watches or warnings for the hurricane or tropical storm conditions.
Spanish moss waved in the trees as the winds picked up in Wilmington, and floating docks bounced atop swells at Morehead City. Ocean water flowed between homes and on to streets on the Outer Banks; waves crashed against wooden fishing piers.
Coastal towns in the Carolinas were largely empty, and schools and businesses closed as far south as Georgia.
Forecasters said conditions will continue to deteriorate as the storm makes its way slowly inland. Its surge could cover all but a sliver of the Carolina coast under as much as 11 feet (3.4 meters) of ocean water, and days of downpours could unload more than 3 feet (0.9 meters) of rain, touching off severe flooding.
WATCH: Highway traffic reversed as people flee Hurricane Florence
Once a Category 4 hurricane with winds of 140 mph (225 kph), the hurricane was downgraded to a Category 1 on Thursday night.
Forecasters said that given the storm's size and sluggish track, it could cause epic damage akin to what the Houston area saw during Hurricane Harvey just over a year ago, with floodwaters swamping homes and businesses and washing over industrial waste sites and hog-manure ponds.
See more stories, photos, and video on Hurricane Florence.
AccuWeather, the National Hurricane Center and the Associated Press contributed to this report.