Dorian’s heavy rains and 90-mph winds made one last slap at Canada on Sunday before the storm headed out to sea, where it’s finally expected to fizzle out by Tuesday.

The former hurricane lashed Nova Scotia, leaving 80 percent of the province without power as electrical lines and trees were uprooted throughout the weekend, according to reports.

More than 500,000 utility customers lost power during the storm and more than 400,000 were without electricity late Sunday.

“This is an exercise of days, not hours,” Karen Hutt, CEO of Nova Scotia Power, said at a news conference, according to reports.

“We’re operating in our worst-case scenario,” Hutt added. “We are still in a very dangerous situation in some parts of the province.”

Now a post-tropical cyclone, Dorian was expected to be past Newfoundland early Monday — with only the sparsely populated, extreme northeast of Canada still under tropical storm watches.

Forecasters say it will be absorbed by another low-pressure system by Tuesday.

Dorian’s 15-day path of terror made it one of the hardest-hitting storms in the history of the Atlantic, topping off with 185-mph sustained winds and gusts over 220 mph when it struck the Bahamas as a Category 5 hurricane.

There have been 45 confirmed deaths from the storm in the archipelago so far, but Bahamian officials estimated the death toll could be “staggering,” with numerous reports of people washed away by storm surges and heavy flooding that left many trapped for up to five days.