Environment and Climate Change Canada (ECCC) issued a fog advisory on Tuesday evening.
"Near zero visibility in fog is expected or occurring. Patchy fog, with near zero visibility, has developed over portions of southern Alberta and southwestern Saskatchewan."
The fog is expected to become more widespread overnight with areas of patchy freezing drizzle.
Visibility may be significantly and suddenly reduced to near zero. Travel is expected to be hazardous due to reduced visibility in some locations. If visibility is reduced while driving, turn on your lights and maintain a safe following distance.
Conditions are expected to improve late in the day on Wednesday.
Cochrane, Olds and Sundre are included in the advisory.
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