What must occur for advection fog to dissipate?

For advection fog to dissipate, a change in wind direction or strength is necessary because this affects the movement of air and its properties. Advection fog forms when warm, moist air moves over a colder surface, causing the air's temperature to drop to its dew point, resulting in the formation of fog.

When the wind shifts or changes in intensity, it can introduce drier or warmer air into the area. This alteration can increase the temperature of the air or lower its humidity, either of which can contribute to the dissipation of the fog. Essentially, a modification in wind conditions can disrupt the temperature inversion that maintains the fog.

The other options focus on changes in temperature, humidity, or cloud cover, which may influence weather conditions but do not directly address the mechanisms specific to the dispersion of advection fog. Therefore, only a change in wind direction or strength effectively alters the existing conditions leading to the fog's formation.