The storm that has already walloped the Virgin Island, Bahamas and North Carolina is now bringing hurricane-force winds to far-eastern Canada.
Dorian has knocked out power to hundreds of thousands of people, toppled a huge construction crane and ripped roofs off apartments in the city of Halifax.
The U.S. National Hurricane Center says the post-tropical cyclone was centered about 55 miles (90 kilometers) east-northeast of Anticosti Island Sunday morning and had top sustained winds of 80 mph (130 kph). It was heading to the north-northwest, roughly up the Gulf of St. Lawrence.
Meanwhile, authorities in the Bahamas were scrambling to find shelter for tens of thousands left homeless by a storm that struck with Category 5 force.
The storm is blamed for at least 49 deaths.