Ontario tornadoes are not usually as severe as the ones in Oklahoma, except one that hit Barrie back in 1985.

Tornadoes are rated on a scale from zero to 5. The Barrie twister was an EF 4 and 12 people were killed.

Most tornadoes in Ontario are considered mild, rated EF zero, but they can still cause a lot of damage.

Peter Kimbell of Environment Canada says, “EF zeros are quite capable of uprooting trees and causing superficial damage to housing, shingles and siding, and every bit capable of causing injuries.”

Kimbell says in the event of a tornado take shelter. “Get in, get down, and cover up. If you are outside get inside, if you are inside get into the basement, or into an interior room.”

Canada has about 70 tornadoes a year compared to about 1200 a year in the US.

The most severe tornado in Canada happened in Manitoba in 2007. It was rated an EF 5, the highest on the scale, and caused plenty of damage. Incredibly, no one was killed.

CTV's Natalie Pierosara will have more on this story tonight at six.