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Astronaut Ricky Arnold captured this image from the ISS of Florence strengthening in the early morning hours over the Atlantic. (Photo provided by NASA)

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Tropical bands from Florence begin lashing Carolinas

Florence's winds had dropped from a peak of 140 mph to 105 mph by midmorning, reducing the hurricane from a terrifying Category 4 to a 2. But forecasters warned that the widening storm — and its likelihood of lingering around the coast day after day — will bring seawater surging onto land and torrential downpours.

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In simulation, Category 4 hurricane devastated East Coast

In the scenario, Cora also slammed hurricane-force winds into three nuclear power stations. One was damaged. Thirty-three major power substations were at risk from storm surge and major flooding.

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South Carolina declares emergency ahead of Florence

The National Hurricane Center said Saturday the storm was expected to become a "major hurricane" by Tuesday as it passes between Bermuda and the Bahamas on Tuesday and Wednesday.