Toronto could see the biggest snowfall of the year. Here’s how much the city could get.

Environment Canada has issued a yellow snowfall warning for Toronto, forecasting significant amounts to begin falling Wednesday night.

Environment Canada (EC) has issued a yellow snowfall warning for Toronto, forecasting significant amounts to begin falling Wednesday night and lasting through to Thursday afternoon.

The weather advisory says amounts of 10 to 20 centimetres are expected to fall, leading to reduced visibility and blowing snow.

In addition to the snowfall warning, Environment Canada is warning of a temperature drop “leading to cold wind chills by Thursday morning.”

The temperature could drop to -9 C and feel as cold as -22 on Thursday morning, according to Environment Canada. The frigid cold will linger throughout the day with the temperature still feeling like - 16 on Thursday afternoon.

• READ MORE: ‘Prepare your parkas’ as Toronto braces for bitter cold temperatures this week
• IN PHOTOS: A closer look at the biggest winter storms to hit Toronto

Cities in Durham, York, Peel, Halton, Hamilton, and Niagara regions are also under the same yellow snowfall warning.

“Thursday’s morning commute is likely to be impacted by snow,” said CTV News Toronto weather anchor Lyndsay Morrison. “It looks like we could be in for five to 15 centimetres of snow overnight tonight and through Thursday morning for parts of the GTA and across the 401 corridor. Hardest hit areas could even see up to 20 centimetres, and that could include areas like Niagara and Prince Edward County.”

• Hourly and daily forecast, including snowfall totals. Visit our CP24.com weather hub here.

Morrison added that temperatures in many areas of the GTA will be in the minus double digits throughout the day on Thursday, and lake effect snow could impact regions south and east of Georgian Bay and Lake Huron.

If the forecasted 10 to 20 centimetres materializes, it could mark the snowiest day in Toronto so far this winter. The most snow recorded in one day at Toronto Pearson International Airport so far this season was 12 centimetres on Dec. 26.

City and TTC prepping for snow

In a post on social media, the City of Toronto says salters will be visiting TTC bus routes and stops located on hills Wednesday afternoon in preparation for the snowfall.

The city says salting on all other roads, bikeways, and sidewalks will begin as soon as snow starts sticking to the pavement.

Plowing and snow clearing will begin when there is two centimetres of accumulation on sidewalks and bike lanes, 2.5 centimetres on expressways, five centimetres on major roads, and eight centimetres on residential streets.

For its part, the TTC says it has activated its winter weather plan.

The transit agency says extra employees and maintenance vehicles have been deployed across the system to spread salt, clear snow, keep signals, switches, and overhead power operating, and respond to any weather‑related issues.

They will also be running anti-icing trains to “keep the power rail and tracks clear of snow and ice,” and be spraying anti-icing on the “entire streetcar overhead network, as well as on the ground at all bus, streetcar, and subway divisions.”

School closures

Various schools in the GTA will make the decision on whether or not schools will be closed, or buses will be running, by 6 a.m. Thursday morning.

CP24 Breakfast and CP24.com will have all the latest updates impacting parents and students.