“Significant” rainfall and possible flooding expected in Oshawa, Whitby and Durham Region through Thursday


Published September 22, 2021 at 4:19 pm

The Weather Network is calling for “significant” rainfall and possible low-lying flooding in Durham Region through Thursday morning.

Showers and isolated thunderstorms are forecast to continue today before moving out Thursday.

Total rainfall amounts of 50 to 60 mm are expected by early Thursday morning with a few localities possibly reaching up to 75 mm. and the possibility of embedded thunderstorms contributing an additional 10 to 20mm. Unsettled weather conditions are expected to follow the passage of the front into Saturday and could contribute even more rainfall.

This widespread rainfall event is due to a cold front and a moisture-laden low-pressure system that will arrive from the American mid-west.

Heavy downpours can cause flash floods and water pooling on roads. Localized flooding in low-lying areas is possible and the Central Lake Ontario Conservation Authority is asking all residents to stay away from watercourses, shorelines, and structures such as bridges, culverts and dams. Increased wave activity, elevated water levels, fast-flowing water, and slippery conditions along stream banks and Lake Ontario shorelines continue to make these locations extremely dangerous.  Please remind children of these dangers.

Flooding is not expected, but heavy downpours could result in flooding of low-lying and flood-prone areas.

This Flood Outlook Statement will be in effect through Sunday, September 26 or until further notice.

Photo by Colin Williamson

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