Earth and Environment Atlas

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Weather front

Meteorology

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A weather front is a boundary separating two air masses whose characteristics differ, such as density, wind, temperature and humidity. Disturbed and unstable weather typically develops along these boundaries: cold fronts can bring thunderstorms and heavy precipitation, while warm fronts are usually preceded by gradual rainfall and fog. Even a front that produces little precipitation is generally marked by a noticeable shift in wind direction as it passes.

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