The Mountain and Valley Breezes

These are Local Winds.

Another combination of local winds that undergoes a daily reversal consists of the mountain and valley breezes.

On a warm sunny day the mountain slopes are heated more than the valley floor.

Hence, the pressure is low over the slopes while it is comparatively high in the valleys below.

As a result gentle wind begins to blow from valley towards slopes and it assumes the name of valley breeze.

After sunset, the rapid radiation takes place on the mountain slopes.

Here, high pressure develops more rapidly than on the valley floor.

Cold arid heavy air of mountain slopes starts moving down towards the valley floor.

This is known as the mountain breeze.

The valley and mountain breezes are also named as anabatic and katabatic breezes respectively.