Snowfall amounts of 5 to 15 cm and freezing rain possible.
Snow associated with a developing low pressure system is expected to begin in the Sault Ste Marie area this afternoon and expand into other areas of Northeastern Ontario tonight. This system is expected to generate heavy snowfall along a west to east axis through Northeastern Ontario. A snowfall warning has been issued for a swath from Wawa to Timmins where current indications suggest that total snowfall amounts will likely be in the 15 to 20 cm range by Tuesday evening.
South of this axis, the precipitation is forecast to begin as snow then change to rain Tuesday. During this transition, freezing rain and ice pellets will be possible and a freezing rain warning may be required. Also, depending on the duration of snowfall, 5 to 15 cm of snow is possible from Sault Ste Marie to Kirkland Lake.
North of the heaviest snowfall axis, significant snowfall amounts are expected with 10 to 15 cm likely for communities such as Hornepayne, Hearst, and Kapuskasing.
For much of Northeastern Ontario, the combination of snow, heavy at times, and moderate northeasterly winds is expected to create poor visibility and winter driving conditions. Consequently motorists should exercise caution when travelling the roads this evening through Tuesday.
Environment Canada will continue to monitor the track of the low pressure system as any change could result in a shifting of the anticipated snow area.
The public is advised to monitor future forecasts and warnings as warnings may be required or extended.