All southbound express lanes of Highway 427 near the Burnhamthorpe Road exit have been reopened after being blocked by a tractor-trailer rollover on Tuesday as winter road conditions returned to the GTA. 

Snow storm van

People in the GTA awoke to an unwelcome sight on Tuesday. Spring-like conditions gave way to snow and sleet, leading to ugly road conditions throughout the region. (David Donnelly/CBC)

According to police, a Chevrolet Equinox car was travelling southbound shortly before 6 a.m. ET when the driver lost control and struck the cement barrier. The tractor-trailer overturned as it swerved to avoid the vehicle. 

There were no injuries to either of the drivers. The truck's load stayed in contact but there was a significant amount of diesel fuel that leaked onto the highway, police said. 

The city says it has 100 snow plows ready to hit the roads if needed, with efforts focused primarily on highways. 

The return of winter

After a weekend of warm, spring-like conditions, the temperature fell from a high of 23 C Sunday to a high of -1 C on Tuesday morning, according to Dave Phillips, senior climatologist at Environment Canada.

Classes cancelled at 2 TDSB schools

Classes are cancelled today at Diefenbaker Elementary School and Cosburn Middle School due to an ongoing power outage.

"I think the feeling out there is that we didn’t deserve this. We’ve endured a lot," Phillips told Matt Galloway, host of CBC's Metro Morning.

It was the coldest winter Toronto has seen since record-keeping began in 1937. But, Phillips said, it is not unusual to see winter-like conditions return throughout April.

"In 76 years, we’ve only had two Aprils without snow in Toronto. So this is not something that is unusual, it is something we expect. Except we think we don’t deserve it," Phillips said. 

Environment Canada issued a special weather statement for the GTA, saying that "persons in or near this area should be on the lookout for adverse weather conditions and take necessary safety precautions." 

The GTA could receive up to four centimetres of snow today before early afternoon, according to Environment Canada. 

Pearson Airport is reporting normal operations this morning, but Air Canada is advising passengers to check their flight status before heading to the airport.