Why is the Grand Banks region often foggy?

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Map of the North Atlantic Ocean showing major ocean currents, with warm currents like the Gulf Stream and North Atlantic Drift highlighted in pink and cold currents in blue. Arrows indicate current directions and relative speeds, connecting the eastern coasts of North America, the western coasts of Europe and Africa, and the Arctic region. — Gulf Stream Major warm and cold currents of the North Atlantic Ocean.

The Grand Banks region is frequently covered in dense fog due to its unique location where the warm, moist waters of the Gulf Stream meet the cold, southward-flowing Labrador Current.41

This phenomenon is a classic example of advection fog. When relatively warm, humid air—often originating from the Gulf Stream—moves over the significantly colder surface waters of the Labrador Current, the air is cooled to its dew point. This cooling causes the water vapor in the air to condense, resulting in the formation of widespread, persistent fog. This climatic interaction is so pronounced that the Grand Banks experiences one of the highest incidences of fog in the world.2341