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Front

Front means the transition zone or interface between two air masses of different densities. We differ between cold front, warm front and occlusion. Cold front means cold air flowing towards warm air, warm front means warm air moving towards cold air and occlusion means merging cold and warm front. If a font does not move it's called a static front.

Warm front
Warm front
Interface between 2 air masses
Interface between 2 air masses