Near-zero visibility prompts advisories for Calgary and area early Friday

Dense fog formed in and around Calgary overnight Thursday, and by Friday morning Environment and Climate Change Canada (ECCC) issued fog advisories with some communities in southern Alberta experiencing near-zero visibility.Conditions are expected to improve throughout the morning, however it is possible that fog will develop again early Saturday in many of the same communities.Sunshine will replace fog in Calgary by Friday afternoon, with a daytime high slightly below the seasonal average of 7