Environment Canada has issued a Freezing Rain Warning and a Special Weather Statement regarding Heavy Rain and possible ponding, for your Sunday, mostly toward the evening. With some areas expected to get several hours of freezing rain and others up to 40mm of rain by Sunday night.
The Freezing Rain Warning for parts of the Waterloo Region but has now ended for the Halton Region reads as follows;
Precipitation associated with an approaching low pressure system is expected to move into the region this morning. For the higher terrain of the Dundalk Highlands, several hours of freezing rain are possible today and tonight as temperatures are expected to remain near the freezing mark.
Over lower elevations the freezing rain will switch to rain in the afternoon with some areas expected to receive 15 to 25 mm.
The freezing rain or rain will change to snow overnight into Monday morning.
Surfaces such as highways, roads, walkways and parking lots may become icy and slippery. Take extra care when walking or driving in affected areas.
Freezing rain warnings are issued when rain falling in sub-zero temperatures creates ice build-up and icy surfaces.
The Special Weather Statement in effect for the rest of the Golden Horseshoe reads;
Significant rainfall likely today and tonight.
Rain associated with an approaching low pressure system will move into the area this morning. The heaviest rain is expected early this evening along with the risk of a thunderstorm.
Total rainfall amounts of 20 to 40 mm are likely, with the highest amounts most likely over Niagara and areas east of Toronto.
Localized ponding in low-lying areas and on roads is possible.
Rain will end from west to east overnight or Monday morning.
Whether you are in a region expecting freezing rain or significant rain it is best to have a care with the roads Today and into Tonight as conditions are not set to improve until Tomorrow morning.
Image and Information from Environment Canada.