Power lines are destroyed in some areas, and as of Sunday morning, some 70,000 customers remained without power.
Ontario Premier Doug Ford said Saturday night he was planning to visit the affected areas sometime today.
More than 270,000 residents and businesses in the Ottawa and Gatineau region are still without power following Friday's violent storm.
Officials in Gatineau said that 200 people there had received housing assistance through the Red Cross.
The agency said that at nearly the same time a second, slightly less powerful twister, touched down in the south Ottawa neighbourhood of Arlington Woods. "We're here to reassure everyone in the region that's been affected that we'll spare no expense, we'll do whatever it takes to make sure we get people back on their feet".
According to Ottawa Mayor Jim Watson, city police, fire services and paramedics were going door-to-door to check-in on residents and to offer transportation to all who need to get to the relief centre.
Yesterday's tornado has devastated communities throughout the Ottawa Valley and on both sides of the river.
He said that roofs were torn off buildings, including a school and apartment buildings, and estimated around 15,000 people had been displaced.
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She urged anyone who came across personal items to take them to West Carleton High School, one of a pair of emergency shelters set up after the storm.
Fred Chartrand/CP Apartment buildings in the Ottawa region had roofs torn off and windows blown out after a tornado caused extensive damage and forced hundreds of families to evacuate their homes on September 21, 2018.
"We were one of the, I'd say, lucky ones in that we were allowed to go back to live in the house".
"It's heartbreaking to say the least", Ford told reporters Sunday afternoon.
Meantime, hydro crews were working to untangle and fix fallen power lines and restore electricity to the region.
"My husband had the wherewithal to say 'Let's just crouch down here by the refrigerator.' So we just huddled together".
Prime Minister Justin Trudeau said Sunday that he'd spoken with the mayors of Ottawa and Gatineau to discuss "how the community is recovering from the damages".