If travelling, be prepared for areas of near-zero visibility. If visibility is reduced while driving, turn on your lights and maintain a safe following distance.
Near zero visibility in fog is expected or occurring.
Dense fog is affecting areas along the shoreline of western Lake Ontario. Conditions may persist through the night.
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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.