Environment Canada issued a yellow rainfall warning for Sarnia, Ontario, and Western Lambton County on March 11, 2026. The weather agency expects between 20 and 40 mm of rain to fall today, which could lead to flooding in low-lying areas and pooling on local roads.
The ground is currently frozen or soaked from previous weather, meaning it has little ability to absorb this new rain. Residents should be prepared for even higher amounts of water if thunderstorms develop in the area this afternoon.
The St. Clair Region Conservation Authority has also issued a flood watch for the local watershed. Officials are urging people to stay away from creeks and rivers, as the heavy rain could cause sudden rises in water levels or washouts near the banks.
Drivers are advised to avoid travelling through flooded streets and to monitor local conditions as the system moves through the region. Community members should continue to track official weather updates throughout the day for safety.
