Advection Fog

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“Fog is simple a cloud on the ground.”(156 Hess) There are four different types of fog; radiation fog, advection fog, upslope fog also called orographic fog, and evaporation fog. The fog found in San Francisco Bay area is called advection fog. Advection fog forms when the air becomes chilled by ocean temperature. The reason San Francisco is almost always foggy is due to the air and ocean temperatures are very different. The more in depth definition of advection fog would be “when warm, moist air moves horizontally over a cold ocean current. Air moving from sea to land is the most common source of advection fogs.”(156 Hess)
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