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Asia - Pacific


Derland, ON

Alerts in Effect

Rainfall Warning

Issued at 15:17 Wednesday 22 September 2021

Significant rainfall expected through Thursday afternoon.

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

Total rainfall amounts of 75 to 100 mm are expected by early Thursday afternoon with a few areas possibly reaching 125 mm.

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.

For information concerning flooding, please consult your local Conservation Authority or Ontario Ministry of Natural Resources and Forestry District office. Visit for the latest details.


Heavy downpours can cause flash floods and water pooling on roads. Localized flooding in low-lying areas is possible.

Rainfall warnings are issued when significant rainfall is expected.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to or tweet reports using #ONStorm.

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