Southern Ontario, particularly the Greater Toronto Area (GTA), is facing severe flooding due to a storm system that has brought heavy rainfall exceeding 100 millimetres, with some areas estimating up to 300 millimetres. Environment Canada has issued multiple weather warnings, including tornado and severe thunderstorm alerts, as conditions have led to numerous road closures and stranded motorists. Emergency services are actively responding to incidents, including rescues of individuals trapped in vehicles and on flooded streets. Toronto Pearson International Airport has experienced delays and cancellations due to leaks and flooding, impacting flight schedules significantly. The storm's impact has also led to the cancellation of local events, such as the King’s Plate horse race. Rainfall is expected to continue into Monday, with isolated showers forecasted thereafter.