Upslope fog forms when moist air is forced up a terrain feature such as a slope. Which fog type is this?

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Multiple Choice

Upslope fog forms when moist air is forced up a terrain feature such as a slope. Which fog type is this?

Upslope fog forms when moist air is forced to rise up a terrain feature such as a slope. As the air climbs, it expands and cools adiabatically. If it cools to its dew point, water vapor condenses and fog forms along the slope. This lifting mechanism—terrain-induced ascent—produces fog that sits on the windward hillsides. This differs from radiation fog, which develops from radiational cooling of the ground on calm, clear nights without lifting; advection fog, which forms when warm moist air moves horizontally over a cooler surface and chills to dew point; and steam fog, which occurs when cold air moves over a warm water body and moisture from the water condenses in the cold air.

Upslope fog forms when moist air is forced to rise up a terrain feature such as a slope. As the air climbs, it expands and cools adiabatically. If it cools to its dew point, water vapor condenses and fog forms along the slope. This lifting mechanism—terrain-induced ascent—produces fog that sits on the windward hillsides.

This differs from radiation fog, which develops from radiational cooling of the ground on calm, clear nights without lifting; advection fog, which forms when warm moist air moves horizontally over a cooler surface and chills to dew point; and steam fog, which occurs when cold air moves over a warm water body and moisture from the water condenses in the cold air.

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