Definition - What does Advection Fog mean?
In the context of viticulture, advection Fog is formed when warm, moist air is cooled from below. The fog forms in thin, horizontal layers and is found along western coastal wine growing regions in the summer months. The fog is believed to improve wine quality, as it tempers the typically hot climate during the summer months.
WineFrog explains Advection Fog
Advection Fog is unique to western coastal growing regions such as France, California and Chile. The fog forms in thin, horizontal layers as moist air moves over cold land or water. As it moves across the landscape, this fog protects the vines from extremes in temperature, delivering moisture and protects the vines from the heat of direct sunlight, allowing the vines to concentrate energy into the grapes instead of struggling with the heat.