Line of thunderstorms, often forming along or ahead of a cold front.- Squall line
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Cloud and precipitation structure associated with an area of rainfall which is significantly elongated.
Rainbands spawned near and ahead of cold fronts can be squall lines which are able to produce tornadoes.
Widespread, long-lived, straight-line wind storm that is associated with a fast-moving group of severe thunderstorms known as a mesoscale convective system.
In many cases, convection-induced winds take on a bow echo (backward "C") form of squall line, often forming beneath an area of diverging upper tropospheric winds, and in a region of both rich low-level moisture and warm-air advection.
Thunderstorm characterized by the presence of a mesocyclone: a deep, persistently rotating updraft.
Of the four classifications of thunderstorms (supercell, squall line, multi-cell, and single-cell), supercells are the overall least common and have the potential to be the most severe.
Dense, towering vertical cloud, typically forming from water vapor condensing in the lower troposphere that builds upward carried by powerful buoyant air currents.
Cumulonimbus can form alone, in clusters, or along squall lines.
Large air mass that rotates around a strong center of low atmospheric pressure, counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere as viewed from above .
Strong cold fronts typically feature narrow bands of thunderstorms and severe weather, and may on occasion be preceded by squall lines or dry lines.
Sudden, sharp increase in wind speed lasting minutes, as opposed to a wind gust, which lasts for only seconds.
Usually, this sudden violent wind is associated with briefly heavy precipitation as squall line.
Complex of thunderstorms that becomes organized on a scale larger than the individual thunderstorms but smaller than extratropical cyclones, and normally persists for several hours or more.
A mesoscale convective system's overall cloud and precipitation pattern may be round or linear in shape, and include weather systems such as tropical cyclones, squall lines, lake-effect snow events, polar lows, and mesoscale convective complexes (MCCs), and generally forms near weather fronts.
Air that flows outwards from a storm system.
Squall lines typically bow out the most, or bend the most convex outward, at the leading edge of low level outflow due to the formation of a mesoscale high-pressure area which forms within the stratiform rain area behind the initial line.
Characteristic radar return from a mesoscale convective system that is shaped like an archer's bow.
A bow echo is associated with squall lines or lines of convective thunderstorms.
Leading edge of a cooler mass of air at ground level that replaces a warmer mass of air and lies within a pronounced surface trough of low pressure.
If there is significant instability along the boundary, a narrow line of thunderstorms can form along the frontal zone.