Heavy fog again blanketed the Edmonton region Friday morning. Environment and Climate Change Canada issued a warning about zero-visibility and visibility varying “suddenly.” “Be prepared for areas of near-zero visibility and allow extra time to reach your destination. If driving, turn on your lights, slow down and maintain a safe following distance,” read the warning. The fog was said to be affecting communities as far west as Edson and right through southeast Saskatchewan. The agency is expecting conditions to improve later in the day.