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And what causes it to come to an end?

2006-11-26 07:19:40 · 5 answers · asked by Anonymous in Science & Mathematics Weather

5 answers

Wind is the roughly horizontal movement of air (as opposed to an air current) caused by uneven heating of the Earth's surface. It occurs at all scales, from local breezes generated by heating of land surfaces and lasting tens of minutes to global winds resulting from solar heating of the Earth. The two major influences on the atmospheric circulation are the differential heating between the equator and the poles, and the rotation of the planet (Coriolis effect).

Given a difference in barometric pressure between two air masses, a wind will arise between the two which tends to flow from the area of high pressure to the area of low pressure until the two air masses are at the same pressure, although these flows will be modified by the Coriolis effect in the extratropics.

Winds can be classified either by their scale, the kinds of forces which cause them (according to the atmospheric equations of motion), or the geographic regions in which they exist. There are global winds, such as the wind belts which exist between the atmospheric circulation cells. There are upper-level winds, such as the jet streams. There are synoptic-scale winds that result from pressure differences in surface air masses in the middle latitudes, and there are winds that come about as a consequence of geographic features such as the sea breeze. Mesoscale winds are those which act on a local scale, such as gust fronts. At the smallest scale are the microscale winds which blow on a scale of only tens to hundreds of metres and are essentially unpredictable, such as dust devils and microbursts.

You could get more information from the link below...

2006-11-26 22:07:34 · answer #1 · answered by catzpaw 6 · 0 0

The movement of air, which is called wind, is caused by a difference in pressure. You may have seen, on the weather section of the news, the forecaster point out low pressure areas or depressions, and high pressure areas or anticyclones. This uneven pressure causes air to flow from where there is high pressure to where there is low pressure. A useful way to imagine this phenomenon is to picture a flat surface, which for the sake of this explanation is the atmosphere. A high pressure area would be raised, like a ridge or small hill and a low pressure area would be lowered, like a trough or small valley. One can then imagine the air flowing down from the high pressure area to the low pressure area, as a fluid sliding down a slope.

Air movement never really comes to an end as the atmosphere is a fluid and extremely dynamic. It is not always windy in the same place (unless you live in Wellington, NZ but thats another story) because these areas of high and low pressure move around.

Air movement is also caused, on a more regular scale, by the heating of air at the equator, which then rises and moves North or South (depending on which side of the equator you are on), cooling as it moves. This air then sinks again around latitude 30 degrees, and the air then flows back to the equator, but at a lower altitude. These circulation systems are known as Hadley Cells. Wikipedia has a good section on Atmospheric Circulation

2006-11-26 07:58:46 · answer #2 · answered by Ed C 1 · 0 0

It is mostly caused by differing temperatures from one area to another. The difference in temperature and humidity between regions causes pressure at what weather people call a front. The laws of physics say that all matter attempts to seek equillibrium, so some air from each region is pushed into the other region, and this results in what we feel as wind. Greater winds are caused by greater differences in pressure at the front.

2006-11-26 07:26:48 · answer #3 · answered by Scorp1227 1 · 0 0

Wind is caused by the rotation of the Earth and affected by temperature and air pressure differences.

2006-11-26 07:24:04 · answer #4 · answered by Lorenzo Steed 7 · 0 0

Yep! The branches are alive and they have rather small mouthes all around the branches! And the mouths blow air at different branches, and those branches blow air at extra branches! yet there'll continually be that one branch that dosnt move :( also hurricanes and shizz are led to at the same time as each and every of the mouths connect mutually to make on massive mouth, i advise wide! like length of a melon! And this melon mouth flies round blowing air at branches! and then the branches move and make wind!!!!!!! .. .. easily its reason at the same time as air flows kind intense stress too low stress. because there are melon mouths at low stress

2016-11-26 23:27:48 · answer #5 · answered by Anonymous · 0 0

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