Environment and Climate Change Canada is forecasting a risk of thunderstorms this evening that may bring high-intensity rainfall capable of causing flash flooding and water pooling on roadways, St. Clair Region Conservation Authority officials stated.
Rainfall amounts could range from 50 to 100 millimetres, with the potential for peak rainfall rates reaching up to 50 millimetres per hour. Due to the isolated and sporadic nature of these storms, rainfall amounts may vary significantly across the region—even between nearby areas, SCRCA officials say.
Low-lying roads and natural floodplain areas may experience elevated water levels. Saturated soil conditions could lead to increased surface runoff, localized ponding, erosion and seepage concerns. In urban areas, intense rainfall in a short period may lead to flash flooding.
The local conservation authority is warning the public to stay away from watercourses and flooded areas, noting that slippery banks, swift currents, and unstable conditions may pose significant safety risks. Children and pets should be kept clear of waterways during this time.
Watershed conditions are being actively monitored, and further advisories will be issued to municipalities and media if flood issues develop. Local emergency response teams and road crews are advised to keep a close watch on conditions as the weather system develops.
Residents are encouraged to continue monitoring Environment Canada’s active weather alerts.
This advisory remains in effect until 12 p.m. on June 25, 2025, unless otherwise updated.
