Short bursts of high speed wind are termed gusts. The convention for directions refer to where the wind comes from therefore, a 'western' or 'westerly' wind blows from the west to the east, a 'northern' wind blows south, and so on. In meteorology, winds are often referred to according to their strength, and the direction from which the wind is blowing. Winds have various aspects: velocity ( wind speed) the density of the gas involved energy content, or wind energy. Winds are commonly classified by their spatial scale, their speed and direction, the forces that cause them, the regions in which they occur, and their effect. In coastal areas the sea breeze/land breeze cycle can define local winds in areas that have variable terrain, mountain and valley breezes can prevail. Within the tropics and subtropics, thermal low circulations over terrain and high plateaus can drive monsoon circulations. The two main causes of large-scale atmospheric circulation are the differential heating between the equator and the poles, and the rotation of the planet ( Coriolis effect). Winds occur on a range of scales, from thunderstorm flows lasting tens of minutes, to local breezes generated by heating of land surfaces and lasting a few hours, to global winds resulting from the difference in absorption of solar energy between the climate zones on Earth. Wind is the natural movement of air or other gases relative to a planet's surface. Cherry tree moving with the wind blowing about 22 m/sec (about 79 km/h or 49 mph)
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