WEATHER WARNING: 30 cm of snow coming to Toronto and southern Ontario

Update: Just before 8 a.m., the warning was upgraded to “Orange” level with a high impact as “significant snowfall continues” across the Greater Toronto Area and southern Ontario.

Environment Canada has three warning levels – yellow, orange and red.

At the orange level, “severe weather is likely to cause significant damage, disruption or health impacts.”

Orange alerts are uncommon and red alerts are rare.

Original story follows.

A major winter storm continues to blanket Toronto, Mississauga, Brampton, the Golden Horseshoe and much of southern Ontario, bringing heavy snowfall, reduced visibility and difficult travel conditions across the region.

According to Environment Canada, snowfall amounts of 20 to 30 centimetres are expected in many areas, with snow continuing through the morning and tapering off later this afternoon.

Areas shaded in orange are under a higher level weather warning on Thursday. Yellow areas areas are also under are warning for snow. Map: Environment Canada

The system is being driven by a strong low-pressure system moving through southern Ontario and into Quebec, spreading widespread snowfall from the Chatham area in the southwest to Montreal in the east. In many communities, total accumulations of 10 to 25 centimetres are expected.

Conditions could be even more severe in areas affected by lake-effect snow. Squalls off Lake Huron may add an additional 20 centimetres of snowfall in parts of the Sarnia to Strathroy corridor.

In addition to heavy snow, the weather agency is warning of whipping winds, blowing snow and the risk of near-whiteout conditions, particularly in open areas and along major highways.

Very cold wind chills are also expected to move in this morning, adding another layer of risk for commuters and anyone travelling outdoors.

Major impact expected on travel

Road conditions are expected to deteriorate quickly, with significant impacts on rush-hour traffic, including delays, collisions, and possible road closures across southern Ontario.

Drivers are being urged to prepare for rapidly changing conditions, allow extra travel time, and avoid unnecessary travel if possible.

Pedestrians are also being advised to use caution, as sidewalks and walkways may become slippery and difficult to navigate as snow continues to accumulate.

What residents should expect

• Snowfall totals of 20–30 cm in parts of southern Ontario
• Reduced visibility due to heavy and blowing snow
• Hazardous road conditions and potential whiteouts
• Very cold wind chills adding to dangerous conditions

Residents are encouraged to monitor weather updates and plan accordingly as winter conditions continue to impact the region throughout the day.