Define valley breeze8/6/2023 ![]() The greater the difference in pressure, the stronger the force. We know that winds are generated by differences in air pressure. In absence of other forces, air moves from high to low pressure due to the "pressure gradient force" this causes horizontal force on the air mass and generates winds.Ģ. A wind is named according to the point of the compass from which it blows, i.e., a wind blowing from the north is a north wind.Įnergy from the Sun is the most important driving force for winds but there are other forces, which are also important: Winds over most areas are variable in direction from day to day. This direction can change with the seasons. In some zones around the Earth, the winds blow predominantly in one direction and this is known as the prevailing wind direction. Air movement occurs on different scales, on a global scale (global circulation of the Earth), over a medium scale (tornadoes) and on a local scale (mountain winds). The air moves from regions of high pressure to regions of low pressure to try to smooth out the pressure differences. These pressure differences cause air to move. Why does air circulate and what are the driving forces for this movement?Įnergy from the Sun heats different parts of the Earth differently and this causes pressure differences to develop across the globe. Short range forecasting using plant and animal behaviour Short range forecasting using the Sun, the Moon, rainbows, clouds and the sky The basics about the main circulation systems and El Niño High Pressure Systems, Low Pressure SystemsĢ. What is weather? Its definition and how it is different to climate The basics about weather, pressure systems and fronts
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