"Hurricane Florence may now be dipping a bit south and hitting a portion of the great state of Georgia. Be ready, be prepared!" Trump said in a Twitter message.
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Hurricane Florence is expected to make landfall as a Category 4 storm in North or South Carolina late Thursday or early Friday morning.
The governors of North and South Carolina, Virginia, Maryland and the mayor of Washington, DC have declared states of emergency ahead of the storm.
Earlier in the day, Trump speculated that Hurricane Florence may likely become one of the strongest witnessed in decades.
He also assured that all the necessary measures were being taken by US power companies so that widespread outages could be prevented.