The US National Hurricane Center has said that Hurricane Arthur was upgraded to a Category 2 storm with maximum sustained winds at 100 miles per hour (160 kilometres per hour).
Arthur was fast approaching the coastline of North Carolina and expected to make landfall late Thursday or early Friday morning, forecasters said as weather conditions deteriorated in the Outer Banks, where vacationers were forced to evacuate on the eve of the July 4 holiday.
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Scotland and Northern Ireland could see rain later but for the rest of the UK it should be a fine day.
Around 31 people are still thought to be missing after the boat sank on a reservoir near the city of Medellin.