Tornadoes are historically proven to be common in certain regions in the South Central Canada regions.
A couple concerns arise with this fact coupled with other forecast elements.
First, the Gulf of Mexico will be open to the Midwest and East Plains this Spring. With severe storms likely to flourish in those areas, some of that moisture will make it to South Canada. If a low pressure system arrives with cold, dry air, severe storms are possible. This will be an important concern for the tornado season.
Also, La Nina will be in effect for the Spring. La Nina creates cooler conditions in the US, and some of that cold comes into the Canadian regions.
Considering those elements, below is the official Weather Centre Canada Tornado Forecast.