Environment Canada has since ended the fog advisory for parts of Simcoe County Thursday morning.
The weather agency said persistent fog has led to near-zero visibility in Barrie, Collingwood and Hillsdale.
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The conditions are expected to dissipate later in the morning.
- Storm to bring up to 60 millimetres of rain to parts of Ontario, Quebec
- A ferocious Hurricane Simon nears Mexico with 155 mph winds and flooding fears
- Simon strengthens into a Category 4 hurricane as it approaches Mexico’s coast
- Isaias weakens but flash flooding threat persist as hundred of thousands grapple with power outages
Environment Canada warns drivers that travel is expected to be hazardous due to reduced visibility in some locations.
If visibility is reduced while driving, turn on your lights and maintain a safe following distance, the weather agency suggests.
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