Storm Dorian with winds of 160kmh has struck the Canadian province of Nova Scotia, toppling trees and cutting power to more than 450,000 homes.
There were no reports of injuries due to the storm so far.
Canada's Public Safety Minister said the military would be deployed to help recovery efforts, and urged those living near the seashore to evacuate as a precaution.
"The safety of Canadians is our number one priority and we're ready to help Atlantic Canada through this storm," Prime Minister Justin Trudeau said on Twitter.
After Nova Scotia, Dorian is expected to move toward Prince Edward Island and on Sunday reach Newfoundland, the Canadian Hurricane Centre projected.
Earlier, Dorian ripped into the Bahamas earlier this week, leaving a trail of destruction and death.

Trump says deal to end war to be signed Sunday, Iran questions timing
India Air Force plane crash kills all five onboard
Ukrainian strike kills one, wounds 3 in southern Russia
Trump says US military strike killed leader of Venezuela's Tren de Aragua gang
Qatar rejects media report on energy production decisions
Trump says Iran war deal close as Strait of Hormuz tensions linger
Victims' families mark Air India crash anniversary with prayers and tributes
Ebola outbreak spreads to crowded displacement camp in Congo
