Drivers in the Toronto area faced a tricky commute this morning after a Texas low tracking across the Great Lakes last night brought ice, snow and freezing rain, leaving roads a slushy mess by morning.

Last night's storm descended on Toronto just after 7 p.m., dropping about 10 centimetres of snow and causing havoc on the roads. There were more than 300 vehicle collisions on Greater Toronto Area highways patrolled by the OPP from Monday afternoon to Tuesday morning as drivers struggled with the season's first winter storm after an unseasonably mild December. There were more than 100 crashes reported on Toronto city streets over the same period.

After midnight, temperatures began to rise, turning the snow to freezing rain, then later rain. By Tuesday morning rain was falling across the GTA, leaving many streets and sidewalks flooded. There are also a few small power outages around the city.

Drivers reported deep pooling on some roads as the slush and snow quickly melted.

OPP Sgt. Kerry Schmidt said although Tuesday morning temperatures have moved well above freezing, roads are still slick.

"The roads aren't too icy but there still are spots where there's slush and water, so drivers just need to focus on that and leave themselves extra time," he said.

Schmidt said most of the collisions that happened last night were single-vehicle crashes.

"Most of the vehicles were just driving too fast for the conditions or drivers just not being aware of how slippery it was," he said.

Toronto Hydro dealt with two major outages and several small ones. As of 9:15 a.m., power had been restored to all but about 400 customers.

Just before 8:30 a.m. GO Transit reported that a track switch problem would delay trains on the Milton line en route to Union Station by about 60 minutes.

Metrolinx spokesperson Anne Marie Aikins said extra crews have been sent out in an effort to keep ice off GO train track switches. She advised passengers to leave themselves extra time.

One GO bus en route to Oshawa slid into a ditch early this morning. The bus suffered minor damage and there were no injuries.

Pearson airport says its operations are running normally, though some flights on the airport's arrival and departures board are listed as delayed and cancelled. Travellers are asked to check their flight status before heading to the airport.