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The Science of Valley Fog


September 23, 2021

National Weather Service

Do you know how valley fog is created? First, air at higher elevations cools down, which then drains downslope into the valley. From there, a cool, stable layer forms near the ground, which limits turbulent mixing and traps the cool, moist air. Finally, the air near the ground continues to cool until water vapor molecules are changed into small droplets of liquid water


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