Environment Canada has issued a fog advisory for southwestern Ontario.
Dense fog is expected to re-form Saturday night and slowly lift late Sunday morning.
The advisory is in effect from Windsor through to Waterloo and includes Elgin, Oxford, Huron-Perth, Grey-Bruce, Sarnia-Lambton and Chatham-Kent.
Visibility may be significantly and suddenly reduced to near zero. If travelling, be prepared for areas of low visibility.
Weather advisories for fog are issued when near zero visibilities are expected or occurring.
