By the afternoon, brief warmth will give way to colder air moving south, causing rain to transition into a wintry mix or snow by evening.
Ottawa and Montreal should pay particularly close attention to the forecast over the coming days, as a major weather event is possible here.
In all, snowfall of 5-15+ cm is expected from east of Lake Superior to North Bay.
Southern Ontario could see 20-40+ mm of rain, while freezing rain totals of 5-20+ mm are anticipated, primarily for Ottawa and eastern Ontario. Not all freezing rain will accrete or build on surfaces however, as winds, rate of precipitation, and surfaces all are taken into consideration when determining ice accretion
Flood watches are in effect for southern Ontario, with flood warnings issued for communities along the Grand River, including Brantford, New Hamburg, and Haldimand County.
Potential impacts throughout the week include power outages, slick road conditions, flooding, ice jams, and fallen tree branches.
The storm track may shift, altering the areas most affected by snow and ice. Stay informed with the latest alerts and updates.
Stay with The Weather Network for more information and updates on your weather across Ontario.
WATCH: Grand River spills onto trails as big thaw continues in southern Ontario
