Weather watch: What you need to know about the winter blast in Ontario

The latest:

Students in Ontario are expected back in classrooms this morning after a period of remote learning — but after a blast of winter weather, some will be learning remotely for at least another day.

Environment Canada published weather alerts for a broad swath of southern Ontario, from snowfall warnings for the Barrie area to winter storm warnings for Hamilton and Ottawa.

In Toronto, Environment Canada posted a winter storm warning, with a total snowfall of between 25 and 35 centimetres expected.

"Snow, at times heavy, with peak snowfall rates of four to six cm per hour possible this morning, which will significantly reduce visibilities," an alert posted early Monday morning said.

In Toronto, city officials on Sunday urged people to "expect hazardous conditions and poor visibility," and to plan accordingly.

The Toronto District School Board said on Twitter on Monday that "all schools will be moving to remote learning" because of the weather conditions.

The Toronto Catholic District School Board made a similar move, saying: "Due to the weather, all school bus transportation has been cancelled & schools are closed for in-person learning today. Staff & students will continue to remain engaged in remote learning at home."

The city of Hamilton is also under a winter storm warning, prompting Environment Canada to urge people in the Toronto and Hamilton areas to consider postponing non-essential travel until conditions improve.

"Surfaces such as highways, roads, walkways and parking lots may become difficult to navigate due to accumulating snow," the warnings say.

The Hamilton-Wentworth District School Board announced early Monday that there would be no in-person or remote learning.

For students in the Hamilton-Wentworth Catholic District School Board, in-school classes were called off, but some remote learning continued.

"Transportation is cancelled and HWCDSB schools are closed for in-person learning today, Monday, Jan. 17, due to inclement weather," the Catholic board in Hamilton said in a tweet. "The elementary virtual school remains open. In-person students can expect to have some asynchronous work posted by 10 a.m."

Snowfall warnings were in effect for parts of Waterloo-Wellington, while winter storm warnings were in effect for parts of York-Durham, according to Environment Canada, including: