Inversion fogs are formed as a result of a downward extension of a layer of stratus cloud, situated under the base of a low-level temperature inversion. They are particularly prevalent off western coasts in tropical regions during the summer, when the prevailing winds blow toward the Equator and cause the upwelling of cold water along the coast. Air that passes over the cold water becomes chilled, its relative humidity rises, and it becomes trapped under the inversion. Subsequent nocturnal cooling may then cause a stratus layer to form and build down to the ground to form an inversion fog.

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