There is a risk of a tornado in the Greater Montreal area, with the region being put under a severe thunderstorm watch on Thursday. “Conditions are favourable for the development of dangerous thunderstorms capable of producing very strong wind gusts, damaging hail and heavy downpours,” said Environment and Climate Change Canada (ECCC). Heavy rain can cause flash flooding and significantly reduce visibility. “When thunder roars, go indoors,” the agency writes. “Lightning kills and injures Canadians every year.” ECCC adds that people should also avoid water activities due to the risk of sudden, violent winds. “Strong wind gusts can damage trees, buildings and overturn vehicles,” it notes. Large hail can also cause significant damage and injury.