Blast of winter to bring 15 to 25 cm of snow to much of southern Ontario It's time to make sure snow shovels are handy as a blast of winter is headed for much of southern Ontario. Environment Canada has issued snowfall warnings and special weather statements as far east as Kingston. Forecasters say snowfall amounts of 15 to 25 centimetres are expected tonight and Friday. The heaviest snow will occur during the Friday morning rush hour along the highway 401 corridor from London to the Greater Toronto area and through the Golden Horseshoe. There could also be heavy and blowing snow for the afternoon commute. Some freezing rain and ice pellets are possible over the extreme southwest.