Sunday's storm knocked out power to thousands of people in Northumberland County and could take several days for repairs.

A man and woman and their dog were able to safely escape the house fire.

The tornado followed a path through the town  before it entered into Georgian Bay and damaged a tree, a power pole and a street lamp, according to a weather summary issued by Environment Canada.

Environment Canada first issued the warnings at around 5:45 p.m. on Tuesday. As of 8 p.m., only Hamilton, Burlington and Oakville were covered under a severe thunderstorm warning.

The federal weather agency placed many municipalities under various warnings and watches on Sunday afternoon for possible tornadoes, severe thunderstorms and rainfall.

The remnants of Tropical Storm Fay could bring periods of intense rain to the Greater Toronto Area on Saturday even though the system is tracking farther east.

Researchers say two other tornadoes touched down near Belgrave, Ont., around 5:45 p.m. and near Brussels, Ont., about 15 minutes later.

According to Hydro One, there were 591 outages in total affecting more than 47,500 customers as of 12 a.m. on Thursday.

Heat and humidity, combined with an unstable air mass and a cold front, mean there will be a strong risk of severe storms in southern Ontario.

"Customers will remain out overnight in central, eastern and parts of northern Ontario."