Significant rain forecasted heightens concerns about freezing and flooding

Five-day extended forecast and more from the Brass Ring event at Midland Cultural Centre.

After last week’s relentless snow squalls buried roads, driveways and patience across the region, Mother Nature isn’t done just yet — she’s just changing tactics.

Environment and Climate Change Canada is warning that a messy mix of rain, freezing temperatures, strong winds and snow is expected to move across large parts of the province starting Thursday, raising concerns about flooding, icy roads and hazardous travel conditions.

According to the federal weather agency, most of southern Ontario is expected to see rain beginning Thursday and continuing into the overnight hours. It notes rainfall amounts of 10 to 20 millimetres are possible as a cold front sweeps through the region.

Environment Canada says the frozen ground left behind by last week’s multiday snow squall event will limit how much of that rain can be absorbed. As a result, water may pool on roads and low-lying areas, increasing the risk of localized flooding.

“Snowmelt may add to the potential for localized flooding,” the agency said in its weather statement, noting the confidence level for impacts is high.

By Friday, conditions are expected to deteriorate further for parts of southwestern Ontario and the Greater Golden Horseshoe.

Environment Canada says temperatures will drop rapidly behind the cold front, causing rain to switch over to snow early Friday morning. Any standing water on roads, sidewalks and parking lots is expected to freeze, creating hard-to-detect icy surfaces.

The weather agency warns that even thin layers of ice can make driving and walking dangerous, particularly during the morning rush hour. Reduced visibility is also possible as snow combines with strong winds.

Wind gusts of up to 70 kilometres per hour are expected in some areas, according to Environment Canada. The agency says loose objects may be tossed by the wind, and blowing snow could further reduce visibility at times.

Snowfall amounts are expected to be relatively modest, with two to five centimetres forecast, but forecasters stress the combination of snow, ice and wind could still lead to significant travel impacts.

Motorists are being advised to slow down, allow extra time for travel and watch for rapidly changing road conditions. Pedestrians are urged to use caution on walkways that may appear wet but could quickly turn icy.