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In meteorology, a warm front is the boundary where a mass of warm air advances and replaces a retreating mass of cold air. Unlike cold fronts, warm fronts typically move more slowly because warm air is less dense and tends to override the colder air. This gradual overriding often results in more widespread and uniform precipitation compared to the more abrupt showers and thunderstorms associated with cold fronts. In winter, warm fronts can sometimes cause severe ice storms if the warm air overrides subfreezing temperatures. A warm front is depicted on weather maps as a red line with semicircles pointing in the direction of movement.1

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