Toronto and most of southern Ontario remain under a winter storm warning as the region experiences an uncommon occurrence of thundersnow and power outages due to the 12-hour snowfall on Friday.  

Environment Canada advises residents to stay off the roads due to poor visibility and snow accumulation.  

Although the snowfall is expected to reduce on Saturday, the weather agency is asking people to be cautious and prepared for quickly changing travel conditions.  

The winter storm resulted in hundreds of flight cancellations at Toronto Pearson International Airport, with almost 19% of scheduled departures and 24% of arrivals cancelled. 

The snow accumulation ranges from 18 cm in Toronto to 20-30 cm in other areas north of the city.  

Line 3 of the subway has been suspended, and shuttle buses are operating instead.