Southern Ontario: Fall Weather Hazards Outlook for Thursday, October 21, 2021

Forecast Discussion

Moderate to heavy rainfall will work its way across Southern Ontario during the day on Thursday with embedded non-severe thunderstorms. The heaviest rainfall totals will be found through the Bruce Penisula and northeast of Georgian Bay where between 20-40mm of rain is possible. The rest of Southern Ontario can expect between 5-15mm of rain with higher amounts closer to Georgian Bay and Lake Huron. Rain will taper off by late Thursday evening as the system moves out over Quebec.