At some point you may have stood on top of a hill and felt a breeze lightly gusting up a hill. Sometimes strong, sometimes completely still. This is caused by the sun heating the ground, which heats the air above it. That air tends to flow up hill and is called anabatic flow.
As the heating decreases toward the end of the day, so will the anabatic flow. Once the sun is sufficiently low and no longer provides enough heating, the upper colder air will begin to flow down hill. This is called catabatic flow. This flow will start in shaded areas first so you want to watch these areas for a change in wind direction.
Section Number
12