Where Environment Canada has winter warnings, watches or advisories in effect, where snow is in the forecast over the next three days, and what each alert means. Alerts are shown as issued — the full text is on the weather alerts page.
The colour tells you the impact. Since November 2025 every Environment Canada alert carries a colour: yellow for moderate or short-lived impacts, orange for significant damage or disruption, red for dangerous and possibly life-threatening conditions. Forecasters set it from the expected impact and their confidence, not from a fixed number of centimetres.
Watch — conditions are favourable for hazardous weather; stay alert and be ready to act. Warning — hazardous weather is happening or expected soon; take action. Advisory — less severe weather that can still disrupt, such as blowing snow or freezing drizzle.
Snowfall — heavy snow. Winter storm — several hazards together, such as heavy snow with freezing rain or strong wind. Blizzard — blowing snow cutting visibility to 400 m or less over a wide area. Freezing rain — rain that freezes on contact and brings down trees and power lines. Snow squall — intense, localized bands of snow, often off the Great Lakes. Cold — dangerously low temperatures or wind chill; the level differs from region to region.