Wind causes the generation of sound. The movement of air causes movements of parts of natural objects, such as leaves or grass. These objects will produce sound if they touch each other. Even a soft wind will cause a low level of environmental noise. If the wind is blowing harder, it may produce howling sounds of varying frequencies. This may be caused by the wind blowing over cavities, or by vortices created in the air downstream of an object. Especially on high buildings, many structural parts may be a cause of annoying noise at certain wind conditions. Examples of these parts are balconies, ventilation openings, roof openings or cables.
George lives in a rural area and has a sort of barren forest behind his house. Sometimes, especially when it is storming spooky sounds can be heard that scare George and he has no idea what they are.

Will a soft wind likely cause rustling noises or howling noises?