Environment Canada has issued a special weather statement for Whitby and the surrounding region, warning residents to prepare for heavy rainfall beginning Saturday, April 4, 2026. A weather system known as a Colorado low is expected to bring 25 to 50 mm of rain through Saturday night, with the heaviest downpours likely during the evening and overnight hours.
The forecast includes a risk of thunderstorms, which could lead to rainfall amounts higher than currently predicted. Residents are encouraged to monitor updates from Environment Canada as the event progresses.
The Central Lake Ontario Conservation Authority, which manages the 130-square-kilometre Lynde Creek watershed in Whitby, is closely watching the situation. Officials note that the ground remains saturated from recent spring weather, which could cause water to run off more quickly than usual during intense rain. Updated flood mapping for the Lynde Creek watershed, completed in 2025, is being used to help monitor conditions.
Local water levels are also a factor. Lake Ontario water levels are currently about 4 inches above the long-term average for March, a situation that can increase the risk of coastal flooding. In light of the incoming storm, residents living in low-lying areas or near waterways should remain cautious. The Region of Durham provides additional resources and information for those preparing for high water through their website.
While the storm approaches, operations at local facilities like the Port Whitby Marina remain a point of interest for the community. Residents concerned about potential infrastructure issues, such as blocked drains or local flooding, can contact the Town of Whitby operations centre for assistance.
