Heavy rain, localized flooding possible in southern Ontario this week

·1 min read
Heavy rain, localized flooding possible in southern Ontario this week

A moist system is tracking into the Great Lakes region and is bringing the risk for thunderstorms and flooding along its cold front.

Southern Ontario will be in the warm sector of the system on Monday afternoon, which means conditions will largely remain seasonal and dry with a chance for a passing shower north of the Greater Toronto Area (GTA).

However, the main event ramps up Monday evening as the cold front slides across Lake Huron.

ON rain
ON rain

The cold front could result in training thunderstorms for Winsor, Sarnia, and the Grey Bruce region. Training thunderstorms line up one behind another and move over the same region, often resulting in repeated rainfall and high accumulations, which increases the risk for localized flooding.

Visit our Complete Guide to Summer 2022 for an in-depth look at the Summer Forecast, tips to plan for it and much more!

Forecasters say that some models disagree with the exact timing and the location of the heavy rain, however, signs are pointing towards considerable rainfall along the Huron shores on Monday evening and overnight.

In Grey-Bruce and cottage country, rainfall totals could range from 25-50 mm with higher accumulations in areas that experience thunderstorms on Monday evening into Tuesday morning.

ON storm risk
ON storm risk

Nocturnal thunderstorms are also on the table as the cold front presses on towards Highway 401 and the GTA during the pre-dawn hours on Tuesday.

Embedded lightning and thunder may wake up Toronto residents early Tuesday, who could then be met with a soggy morning commute.

ON lightning
ON lightning

Stay tuned to The Weather Network for all the latest on conditions across Ontario.

Our goal is to create a safe and engaging place for users to connect over interests and passions. In order to improve our community experience, we are temporarily suspending article commenting