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The symbol for a cold front.
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The symbol for a cold front. Fronts are the boundaries between two air masses. Fronts are classified as to which type of air mass (cold or warm) is replacing the other. For example, a cold front demarcates the leading edge of a cold air mass displacing a warmer air mass. A warm front is the leading edge of a warmer air mass replacing a colder air mass.

If the front is essentially not moving (i.e. the air masses are not moving) it is called a stationary front. Learn more about our weather in JetStream - An Online School for Weather.

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