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What is wind?

For those of you who are interested in the science of meteorology, here is a short explainer from Earth Networks that describes what causes wind and how it is measured. In brief, wind is just the flow of air caused by differences in air pressure that cause the air to move from areas of high pressure to low pressure over time. Mostly, when we talk about wind we are discussing horizontal air movement but you can also have strong vertical winds in thunderstorms.