Which statement about fog types is false?

Which statement about fog types is false?

• A. Radiation fog forms when the ground cools rapidly at night and dew point is reached.
• B. Advection fog forms when warm, moist air moves horizontally over a colder surface.
• C. Upslope fog forms when moist air is forced to rise up sloping terrain and can persist for extended periods.
• D. Fog always dissipates within a few minutes regardless of conditions.

Answer: (D)

Fog lasts or dissipates based on surface conditions, moisture, and air mixing. Radiation fog forms when the ground cools rapidly at night and the near-surface air reaches the dew point; it usually forms under clear skies with light winds and tends to lift as the sun heats the surface and winds increase, sometimes taking hours after sunrise. Advection fog happens when warm, moist air moves horizontally over a cooler surface; it can persist as long as the moist air continues to slide over the colder ground or water. Upslope fog occurs as moist air is forced to rise along terrain, cooling and condensing; it can endure for extended periods if the upslope flow and humidity persist. Saying fog always dissipates within a few minutes regardless of conditions is incorrect because these processes show how duration depends on continued cooling, saturation, and wind or moisture supply. Fog can linger for hours or even longer under many common conditions.

Fog lasts or dissipates based on surface conditions, moisture, and air mixing. Radiation fog forms when the ground cools rapidly at night and the near-surface air reaches the dew point; it usually forms under clear skies with light winds and tends to lift as the sun heats the surface and winds increase, sometimes taking hours after sunrise. Advection fog happens when warm, moist air moves horizontally over a cooler surface; it can persist as long as the moist air continues to slide over the colder ground or water. Upslope fog occurs as moist air is forced to rise along terrain, cooling and condensing; it can endure for extended periods if the upslope flow and humidity persist.

Saying fog always dissipates within a few minutes regardless of conditions is incorrect because these processes show how duration depends on continued cooling, saturation, and wind or moisture supply. Fog can linger for hours or even longer under many common conditions.