global winds and local winds

Introduction to windsWhat are winds
How are winds classified Types of global windsThe coriolis force
What are land and sea breezes
Valley breeze ad mountain breeze
How are winds measured
Important wind words


Climate Change
Earth System
Ocean Acidification
Ozone Depletion
Renewable Energy

Water Scarcity
Waste and Recycling

Mountain and Valley Breezes

In a similar behavior as land and sea breezes, mountains (hilly) and surrounding valleys also have breezes called Mountain and Valley Breezes.
What is valley breeze

During the day, the air over the mountain slope heats up more than the air at the foot of the mountain. The warm air over the slope reduces in density. A low pressure is created at the top of the mountain and high pressure from the cool air below forces a cool breeze to move upward. This condition generates a breeze which we call Valley breeze, and it is very common during warmer months when there is a lot of heating from the sun.
What is mountain breeze

In the night, it is a lot cooler as the sun goes to sleep. So the air at the upper slope of the mountain cools off very quickly and becomes dense. A high pressure is created. At this time, the air at the valley floor is a lot warmer (low pressure) and is forced to give way to colder air moving down the slope towards the valley floor. This is called mountain breeze, and it is a lot common in the colder months when there is less warming from the sun.

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how is wind created