South Carolina grapples with storm damage as Florida searches for survivors

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Saturday promised to reveal Hurricane Ian's true impact in South Carolina after the storm's second landfall, while rescuers continued to comb hard-hit Florida, where record river flooding was expected.

At least 73 people have died in the storm in Florida and four in North Carolina, according to state officials and an NBC News count.

Ian made landfall in South Carolina as a Category 1 storm on Friday afternoon and has since been downgraded to a post-tropical cyclone.

The National Hurricane Center said in an advisory Saturday that the storm would continue to weaken near the border of North Carolina and Virginia throughout the day, adding that it would weaken even more through Sunday. Still, officials have warned that Ian and its aftermath pose a grave danger, with warnings of flash flooding across parts of both states.

And Ian is expected to produce between 3 to 6 inches of rainfall on Saturday across parts of North Carolina and West Virginia.

More than 1.3 million customers in Florida were without power early Saturday, three days after Ian slammed into the state. In South Carolina, more than 63,000 homes and businesses were without power after the hurricane hit. Throughout the day, power came back slowly in these states as rescue efforts continued in Ian's wake.

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This article was originally published on NBCNews.com