weather term
Cold Front
The leading edge of an advancing mass of cooler air, which typically brings a sharp, short burst of rain or storms as it passes.
Because cold air is denser than warm air, a cold front wedges underneath the warmer air ahead of it, forcing that air to rise quickly and often triggering brief, intense showers or thunderstorms right along the front. Temperatures usually drop noticeably within an hour or two of a cold front passing, along with a shift in wind direction.