The St. Clair Region Conservation Authority (SCRCA) issued a flood outlook for its watershed on Wednesday afternoon.
The alert was put in place due to the risk of isolated thunderstorms which the SCRCA said could lead to high-intensity rainfall, ponding, and increased runoff.
Starting Wednesday evening, through midday Thursday, Environment Canada is forecasting between 15 millimetres and 25 mm of rain across the region, with an additional 10 mm to 25 mm possible in thunderstorms.
The national weather agency said rain will likely continue Thursday afternoon into early Friday morning, with another 5 mm to 15 mm in the forecast.
The SCRCA said high amounts of rainfall in a short period of time can lead to increased runoff and flash flooding, particularly in urban areas.
It said rainfall amounts could be higher in localized areas due to the nature of convective storms. However, wildfire smoke could hinder thunderstorm development and intensity.
Water levels may elevate into natural floodplain areas and low-lying roadways may be impacted. The soil may become saturated which could lead to ponding, increased runoff into watercourses, and possible increased erosion and seepage issues.
We're being reminded to avoid watercourses and flooded areas due to dangerous conditions, slippery banks, and cold, swift moving water.
Children and pets should be kept away from the water.
The SCRCA's coverage area includes the Sydenham River watershed and smaller watersheds draining directly into southern Lake Huron, the St. Clair River and northeastern Lake St. Clair.