According to a special weather statement issued by Environment Canada for Toronto and most of southern Ontario Sunday, significant snow, freezing rain, and strong winds could be on the horizon.
Snow and ice pellets are expected to arrive after midnight Monday, then will change through freezing rain to rain Tuesday as milder air arrives briefly.
Between five and 15 centimetres of snow and ice pellets are expected to accumulate in some areas, along with ice buildup from freezing rain.
Environment Canada says this weather system may have a significant impact on travel.
Snow will begin during the day on Tuesday.
Snow will overspread the area during the mid/late morning on Tuesday, with all of us seeing snow by around noon.
IMPACTS: Travel will again be hard and even hazardous starting overnight tonight and likely through Tuesday. Flakes should start falling around 3 p.m.in Boston, the weather service said in forecasts early Monday.
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Before the Colorado system reaches the region, Environment Canada is forecasting a daytime high of 0 C on Monday, with a 40 per cent chance of flurries and some risks of freezing drizzle.
Precipitation should ease up starting in the early hours of Wednesday morning, although it could linger into the Wednesday commute, especially north and west of Boston.
The city will see a small taste of precipitation tonight, with two centimetres of snow expected overnight.
Snowfall amounts of 25 to 30 centimeters and blowing snow are forecast for Tuesday, and into Wednesday.
Pacific Northwest residents who are more accustomed to rain than snow are digging out from a winter storm and bracing for more.
How much is possible in an extreme case?
And what if this storm's a dud?