A major snowstorm will hit southern Ontario Thursday and Friday.

A snowfall warning has been issued for southwestern Ontario. The Highway 401 corridor from London to Toronto will be hardest hit during the Friday morning rush.

In a severe weather bulletin, Environment Canada warned 15 to 25 centimetres of snow is on the way.

"The snow will begin across southwestern Ontario Thursday morning and then move into the Greater

Toronto Area by the late afternoon," said Gerald Cheng, a meteorologist at The Weather Network. "It will be light to start and will intensify through Thursday night."

An Alberta clipper combined with moisture from a Texas low is bringing the white stuff to Ontario.

"By Friday afternoon, the accumulation will lighten up in the GTA, but will continue to hit eastern Ontario,"

Weather Network meteorologist Gina Ressler said. "Strong winds however, will continue to bring blowing snow right across the region."

Gusts of 60 km/h will likely hit south-central Ontario.

Road conditions will be dangerous Friday.

"Travelling conditions will deteriorate and become hazardous in the snow and blowing snow (Thursday night) and Friday. There may be a significant impact on the commute to work on Friday morning and possibly

Friday afternoon in heavy snow and blowing snow," Environment Canada said.

The storm will also bring snow to Atlantic Canada.

"While the storm will be seen on Friday, the worst of the weather will be throughout the day Saturday for the Maritimes and Sunday for Newfoundland & Labrador," said Ressler.

- With files from John Miner