Wind is the flow of air or other gases that compose an atmosphere (including, but not limited to, the Earth's). Wind is air molecules in motion on Earth, and in the case of the solar wind, the movement of charged particles from the sun through space. Differences in density between two air masses lead to wind. Differential heating between the poles and the equator lead to the development of the jet stream and the associated climatological mid-latitude westerlies, polar easterlies, and the trade winds. Winds are commonly classified by their spatial scale, their speed, the types of forces that cause them , the geographic regions in which they occur, and their effect. Wind speeds over much of the globe are measured over a ten-minute time frame, except the United States which uses a two-minute average. Winds are plotted on surface weather analyses within station models, indicating the direction the wind is blowing from as well as its strength.

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