Under some conditions, flying a helicopter just above a fog deck can help to disperse the fog.

Question

Quizplus · Accepted Answer

The downwash from a helicopter's rotor blades can help to mix the air and disperse the fog, particularly if the air temperature is near the dew point temperature of the fog. However, this technique is not always effective and can be dangerous if visibility is too low. It should only be attempted by experienced pilots with appropriate training and equipment.

Under Some Conditions, Flying a Helicopter Just Above a Fog