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RALEIGH, N.C.  -- With mandatory evacuations already issued for parts of three East Coast states, millions of Americans are preparing for what could become one of the most catastrophic hurricanes to hit the Eastern Seaboard in decades. Carrying winds of up to 140 mph as a Category 4 storm, Hurricane Florence is expected to strengthen and become a Category 5 storm Tuesday. It's then forecast to close in on North or South Carolina on Thursday, hitting a stretch of coastline that's vulnerable to rising sea levels due to climate change. If Florence makes landfall as a Category 4 hurricane, it will be the strongest storm on record to come ashore in North Carolina. "Please be prepared, be careful and be SAFE!" President Donald Trump tweeted Monday evening. South Carolina's governor ordered the state's entire coastline to be evacuated starting at noon Tuesday and predicted that 1 million people would flee. At noon on Tuesday, CBS News correspondent D