Frosty weather alert lifted for GTA: Environment Canada - CBC
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Prepare for the fall's first foggy, frosty morning commute
Why fall mornings bring fog, frost, and a riskier commuteFall's first cold morning can trigger a chain reaction before you even leave the driveway: Frost coats the windshield, the tire pressure lights up on your dash and fog hides the road ahead. The weather setup starts overnightFall's longer nights give the ground more time to release the heat it absorbed during the day. Clear skies let that heat escape more efficiently, while light winds keep warmer air above from mixing back down to the surface. High pressure often sets up these exact conditions — clear and calm.(MORE: Weather alerts decoded: What advisories, watches and warnings really mean) This process is known as radiational cooling, and it steadily lowers the temperature of the ground and the air just above it.
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