If visibility is reduced while driving, slow down, watch for tail lights ahead and be prepared to stop.
Near zero visibility in fog is expected or occurring.
An area of dense fog near Lake Ontario early this evening is expected to expand and persist through tonight. Visibility will improve through the morning on Sunday.
###
Visibility may be significantly and suddenly reduced to near zero.
Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or tweet reports using #ONStorm.