Environment Canada issued a special weather statement warning of a mixed bag of weather across southern, central and eastern Ontario Tuesday.
"Everything from rain to freezing rain to snow affected southern Ontarians on their morning commute," says Dayna Vettese, a meteorologist at The Weather Network. "The Greater Toronto Area saw mainly heavy rain through the morning hours leading to many accidents due to slick highways and hydroplaning."
In Milton, one vehicle lost control and collided with another car while driving over a slippery hill on Campbellville Road. Both drivers were taken to hospital and the road was closed for an hour.
The poor driving conditions also forced the cancellation of several school buses across the region early Tuesday.
While some places will see a brief warm-up through the day, temperatures will quickly drop through the evening hours as the low pressure system passes over the region.
As the cold air ushers in, any standing water from the morning rain will freeze.
"The colder conditions will also result in periods of light snow in southern Ontario with possible accumulations from 1-3 cm through the overnight," says Gerald Cheng, another meteorologist at The Weather Network.
For places further north and east, up to 10 cm of snow is likely through Wednesday.
In addition to the mixed precipitation Tuesday, strong winds are forecast as well.
Winds gusts up to 90 km/h are likely near the east end of Lake Erie, where winds warnings have been issued.
According to Environment Canada, these winds are strong enough to bring down some tree limbs and could cause local power outages.
Conditions are also favourable for the development of snow squalls off of Lake Huron and Georgian Bay.
Driving conditions are expected to deteriorate quickly with very low visibility expected at times. Police officials are urging motorists to slow down and be prepared for dangerous winter travelling conditions as untreated surfaces can become icy and slippery.