A cold front is defined as the leading edge of a cold mass of air at ground level that replaces a warm mass of air and lies within the apparent surface of low pressure that forms behind an extratropical cyclone which occurs on the leading edge of cold air. The convection pattern called the cyclone's dry "conveyor belt" flow.
These front forms when a cold, dense air mass pushes under a warm, lighter air mass which forces the warm air to rise. The cold air advances, replacing the warm air at the surface.
Thus, Cold front may have clear skies and creates violent thunderstorms.
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