Dense fog will mean ‘near zero’ visibility in parts of southern Ontario

As the weather bounces back from nearly a week of arctic air, Environment Canada has issued a fog advisory for a large swath of southern Ontario.

“Dense fog” is expected on Monday morning before lifting in the early afternoon, causing considerable problems with visibility on roads, the national weather agency said in a statement.

The advisory is in effect for Caledon, Orangeville, Innisfill, Newmarket and Uxbridge, as well as communities further out from Toronto.

“Visibility may be significantly and suddenly reduced to near zero. Travel is expected to be hazardous,” the advisory said.

Drivers should be sure to keep vehicle lights turned on and follow the motorist in front of them at a safe distance.