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Message: <blockquote data-quote="NhustlaR" data-source="post: 3035723" data-attributes="member: 562142">lake turning:When the annual seasonal cycle enters late summer and autumn, cold air masses begin dragging polar air southward and the diminishing hours of sunlight allow more radiational heat to escape than is gained from the sun during the day. As a result of both radiational cooling and contact cooling with colder air, lake surface waters start to cool from their summer peaks. Though the epilimnion lake waters cool slowly, their eventual drop in temperature makes them denser than the waters below. When these waters reach about 10oC (50oF), they sink into the thermocline waters below, erasing the temperature stratification that had built during summer.</blockquote>

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