Driving in parts of the GTA tonight, will be like driving through a bowl of pea soup.
Thick fog is expected to roll in overnight.
As a matter of fact, forecasters are expecting it to be so bad, they are out with a fog advisory.
They say in some spots it will be so bad, visibility will be next to nil.
Some of the areas that will be hardest hit will be Northern Durham Region, Newmarket, Georgina, Vaughan, Richmond Hill, Markham and a large portion of cottage country.
The good news, it's expected to burn off early on Thursday morning.