Snow and strong winds are set to hit the Greater Toronto Area on Tuesday morning, Environment Canada warns.
The agency issued a special weather statement on Monday evening warning a low pressure system will bring between 5-10 centimetres of snow to southern Ontario, much of which will likely fall during the morning commute.
Wind gusts, meanwhile, could hit 70 km/h and create blowing snow and poor visibility.
"Motorists are advised to exercise caution as the roads may become hazardous at times," Environment Canada said in its statement.
The snow will likely start falling shortly after 3 a.m. and could be at its heaviest around 7 a.m., said CBC meteorologist Jay Scotland.
A fast moving Alberta Clipper system rolling into town is to blame, Scotland said, and for drivers it's "not good news."
The snowfall is expected to stop in the afternoon, but there could be more light snow in the evening.
Tuesday's high is set to hit -1 C, with the temperature plunging to -7 on Wednesday.