1. Precipitation will stay predominantly as rain from windsor to london. On the front side some mixing with wet snow is likely before the change over. On the back side of the system snow showers will wrap around through the area under the upper level low. 850mb temperatures will hover just below the freezing mark but 925mb temperatures are above zero for most of the event.
2. A line from cambridge/kitchener east to oshawa will see wet snow with this system, mixing with rain at times especially in the morning hours on tuesday. The time of day will be in our favor with 850mb temperatures below zero for the entire event. 925mb temperatures will hover just around the freezing mark with the exception of areas right along the lake shore who will experience mainly rain with this event. I can see 3-8cm accumulations across the area including the GTA north of the lake.
3. From orillia northeast to ottawa and montreal this should stay predominantly as a snow event. Snow will be wet at times especially in areas close to the mixing boundary outlined on the map. I think ottawa, north bay and sudbury have a shot at 10-15cm but i am going with a general 6-15cm across the area. The montreal area may experience some mixing issues with higher boundary level temperatures but precipitation should stay mostly as a wet snow(4-10cm).
Feel free to ask any questions you may have!