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What is a cold front

User PrimRock
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A cold front is the boundary of an advancing mass of cold air, in particular the trailing edge of the warm sector of a low-pressure system.
User John Beynon
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A cold front is the leading edge of a cooler mass of air, replacing at ground level a warmer mass of air, which lies within a fairly sharp surface trough of low pressure.
User Chris Cousins
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