The wind: It's possible Dorian could land with winds somewhere between 130 and 140mph. Even well-built homes could lose roofs and exterior walls, reports USA Today. And, of course, trees and power poles won't fare well. The hurricane center warns that
resulting power outages could last weeks, possibly months.
The darkness: Landfall may come at night. "One of the worst things you can have is a dark landfall," says meteorologist Chad Myers of CNN. "You hear things moving, you don't know where they came from. You don't how big that thing was that just crashed."
https://www.newser.com/story/279858/dorian-just-got-an-upgrade.html
The rain: Dorian is moving relatively slowly, which means it could
dump prodigious amounts of rain on land.