Which fog forms when warm moist air drifts over a colder land or water surface, common in coastal areas?

Which fog forms when warm moist air drifts over a colder land or water surface, common in coastal areas?

• A. Cirrocumulus
• B. Advection Fog
• C. Nimbostratus
• D. Cumulonimbus

Answer: (B)

Advection fog forms when warm, moisture-laden air moves horizontally over a surface that is cooler. As the air travels over land or cold water, it is cooled to its dew point, causing water vapor to condense into tiny droplets and create fog. This horizontal transfer of air and cooling is why it’s common in coastal areas, where sea air moves over cooler land or near-shore surfaces. The other options are cloud types not produced by this horizontal cooling process: Cirrocumulus are high-altitude clouds, while Nimbostratus and Cumulonimbus are rain-bearing or storm clouds, not fog formed by advection.

Advection fog forms when warm, moisture-laden air moves horizontally over a surface that is cooler. As the air travels over land or cold water, it is cooled to its dew point, causing water vapor to condense into tiny droplets and create fog. This horizontal transfer of air and cooling is why it’s common in coastal areas, where sea air moves over cooler land or near-shore surfaces. The other options are cloud types not produced by this horizontal cooling process: Cirrocumulus are high-altitude clouds, while Nimbostratus and Cumulonimbus are rain-bearing or storm clouds, not fog formed by advection.