The Greater Toronto Area is currently under a special weather statement, with Environment Canada forecasting up to 40 mm of rain by Saturday morning.

The most intense rain is expected to occur late Friday through the early morning hours of Saturday, before changing to snow late Saturday morning, with as much as 10 cm expected.

"The frozen ground and snowpack will have a reduced ability to absorb this rainfall," Environment Canada says, warning that precipitation is likely to pool, especially where storm drains are covered in ice or snow.

The Toronto and Area Conservation Authority also warns heavy rain and positive temperatures on Friday will increase the potential for ice breakups.

It said some of the locations to look out for include the Humber River at Old Mill Road, Lower Don River, Etobicoke Creek at Marie Curtis Park, and Duffins Creek at Bayly Street in Ajax.

Flurries and rain are also possible on Sunday, with a high of 3 C.