A powerful storm that rolled through the region early Monday morning washed out west-end roads, caused flooding and ignited a small fire when lightning struck an east-end home.

Environment Canada says 46 millimetres of rain fell on the Ottawa-area over a 12-hour period. Normally, Ottawa gets an average of 60 millimetres of rain for the entire month of April.

Heavy rain washed out the road above a culvert on Torbolton Ridge Road in west Ottawa. It also washed out parts of nearby Dunrobin Road, near Constance Bay.

"I've never heard such powerful rain as last night," said resident Martine Messier.

It's the second time heavy rain has washed away parts of Dunrobin Road in less than a year. The last time was August 2010.

The councillor for the area says something needs to be done.

"The whole community has one road in and out . . . It's a major concern to all of us," Coun. Eli El-Chantiry told CTV Ottawa on Monday.

The storm also flooded about 30 driveways at MacLaren's Landing in west Carleton. A small mudslide was also reported near St. Joseph's Boulevard in Orleans.

As the storm swept through the region, it also caused widespread power outages.

At one point, nearly 5,000 customers in Ottawa were without power. Hydro One reported 11,000 power outages across eastern Ontario.

The storm also brought other problems.

Thirty-six firefighters were called to a home in Navan just after 6 a.m. when a fire broke out after lightning struck the roof.

Firefighters say two adults were awake when the lightning hit. They managed to escape uninjured.

The roof and one of the home's walls sustained damage. The home's contents were not affected.

With a report from CTV Ottawa's Joanne Schnurr