What is a front? What are warm fronts and cold fronts?

A cold weather front is defined as the changeover region where a cold air mass is replacing a warmer air mass. ... A warm weather front is defined as the changeover region where a warm air mass is replacing a cold air mass.

front- The boundary between two air masses that have different temperatures or humidity. In the mid-latitude areas of the Earth, where warm tropical air meets cooler polar air, the systems of fronts define the weather and often cause precipitation to form.

warm front-  A warm front is a density discontinuity located at the leading edge of a homogeneous warm air mass, and is typically located on the equator-facing edge of an isotherm gradient.

cold fronts-  A cold front is the leading edge of a cooler mass of air at ground level that replaces a warmer mass of air and lies within a pronounced surface trough of low pressure. It often forms behind an extratropical cyclone, at the leading edge of its cold air advection pattern—known as the cyclone's dry "conveyor belt" flow.

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