https://weather.com/en-CA/canada/news/news/2017-12-12-snowy-weather-toronto-road-conditions

Winter doesn’t officially arrive for nine days, but the first significant snowfall of the season has arrived in the GTA — and it is having a big impact on the Tuesday morning commute.

Traffic was already an issue early on, with parts of the Highway 401 closed due to jack-knifed tractor-trailers. OPP Sgt. Kerry Schmidt said there have been more than 10 jack-knifed tractor-trailers overnight.

Much of southern Ontario was under a special weather statement, including Toronto and the GTA. Some areas near Lake Huron also under a snow squall watch.

The special weather statement ended just before 11 a.m. on Tuesday.

Toronto received around six centimetres of snow overnight, while some areas outside of the city received close to 10 centimetres of snow. Environment Canada says another five centimetres of snow is expected to fall on Tuesday before tapering off to flurries.

680NEWS meteorologist Jill Taylor says while the snow will wind down later on Tuesday, the winds will pick up to 40 km/h and it will get colder. By the afternoon, it will feel like -14 C with the wind. The windy conditions will continue overnight as the windchill drops to -19.

Meanwhile, Toronto’s Medical Officer of Health has issued an Extreme Cold Weather Alert that will be in effect until further notice. Extreme Cold Weather Alerts are issued when the temperature is forecast to reach -15 degrees Celsius or colder, or when the wind chill is forecast to reach -20 or colder.

Environment Canada warns poor winter driving conditions are likely, which will impact the Tuesday commute. Salt trucks and snow plows have been out on the roads all night across the GTA, getting streets ready for the morning.

If you are flying out of Pearson International Airport, check your flight status before heading to the airport. As of 5:30 a.m., at least 150 flights in and out of the airport have been cancelled.

This story was originally published on toronto.citynews.ca.