Environment Canada issued a yellow fog advisory for Port Colborne, Ontario, on the morning of March 4, 2026, warning that heavy fog is making it very difficult to see on the roads. The weather alert was put in place at 5:08 AM EST as thick fog moved across the Southern Niagara Region.
According to Environment Canada, the fog has dropped visibility to near-zero in some spots, which creates dangerous conditions for drivers. People are being told to slow down, turn on their lights, and keep a safe following distance from other cars during the morning commute.
The weather agency expects the fog patches to clear away as the morning progresses. Once the fog disappears, residents can expect a sunny rest of the day with temperatures reaching a high of 6°C.
