A squall or squall line is a line of thunderstorms with a common leading convection line, or mesocyclone, which tends to create a powerful gust front. It is classified as a multi-cell thunderstorm, since the line comprises multiple fronts. Squalls are sometimes associated with hurricanes or other cyclones, but they can also occur independently. Most commonly, independent squalls occur along front lines, and may contain heavy precipitation, hail, frequent lightning, dangerous straight line winds, and possibly tornadoes and waterspouts.
Multicell line storms consist of a line of storms with a continuous, well developed gust front at the leading edge of the line.
Flash floods occasionally occur when the squallline decelerates or even becomes stationary, with thunderstorms moving parallel to the line and repeatedly across the same area.
Squalllines with a confirmed severe weather history allow for the issuance of reliable warnings.
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