How natural wind happens
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When rain is approaching, the air pressure is low. As there is a big difference of air pressure between areas that are going to rain and areas that are not, strong winds (from non-raining areas) happens.
If strong enough winds from different areas collide with each other, a hurricane is formed. A tornado is caused by warm air from land at sea. However the effects of both are the same: they cause destruction. The former commonly occurs in areas with large open fields. The latter is caused by warm weather that could be attributed by global warming.
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