See more Toronto Sun on Google — save as a Preferred SourceEnvironment Canada issued a tornado warning for parts of Niagara Region as a severe thunderstorm moved through the area on Sunday, but that warning has since ended. The advisory was issued just before 12:30 p.m. for St. Catharines-Grimsby-Northern Niagara Region as Environment Canada tracked a severe thunderstorm that could have produced a tornado and brought "damaging winds, large hail and locally intense rainfall. Anyone out on the water when threatening weather approaches should return to shore and seek shelter, if possible, or move directly away from the path of a tornado, the agency said. Advertisement AdvertisementAdvertisement Advertisement"Emergency Management Ontario recommends that you take cover immediately if threatening weather approaches." Rainfall warnings in Niagara and beyondA yellow warning for rainfall was also issued at 3:47 a.m. on Sunday for Niagara Falls-Welland-Southern Niagara Region and St. Catharines-Grimsby-Northern Niagara Region.