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A squall line is an elongated line of severe thunderstorms that can form along or ahead of a cold front. [25] [26] In the early 20th century, the term was used as a synonym for cold front. [27] The squall line contains heavy precipitation, hail, frequent lightning, strong straight line winds, and possibly tornadoes and waterspouts. [28]
A weather radar image of a mesoscale convective vortex (MCV) over Pennsylvania with a leading squall line. A squall line, or quasi-linear convective system (QLCS), is a line of thunderstorms, often forming along or ahead of a cold front. In the early 20th century, the term was used as a synonym for cold front (which often are accompanied by ...
A squall line is an elongated line of severe thunderstorms that can form along and/or ahead of a cold front. [11] [12] In the early 20th century, the term was used as a synonym for cold front. [13] The squall line contains heavy precipitation, hail, frequent lightning, strong straight-line winds, and possibly tornadoes and waterspouts. [14]
A squall line (commonly abbreviated SQLN) is a line of thunderstorms, most or all of which have attained severe limits, traveling in an organized fashion. The greatest threats within a SQLN are damaging winds, large hail, and flash flooding, though tornadoes are possible.
A squall line is an elongated line of severe thunderstorms that can form along or ahead of a cold front. [35] [36] The squall line typically contains heavy precipitation, hail, frequent lightning, strong straight line winds, and possibly tornadoes or waterspouts. [37]
In the forefront, there are different cumulus species evolving from the cumulus mediocris to the cumulus congestus; behind, there are cumulonimbus calvus; finally, the huge cumulonimbus capillatus incus dominates the background showing a strong thunderstorm. A flanking line is an area of cumulus congestus or small cumulonimbus that mark an area ...
Outflow boundary on radar with radial velocity and frontal boundary drawn in.. An outflow boundary, also known as a gust front, is a storm-scale or mesoscale boundary separating thunderstorm-cooled air from the surrounding air; similar in effect to a cold front, with passage marked by a wind shift and usually a drop in temperature and a related pressure jump.
For thunderstorms, outflow tends to indicate the development of a system. Large quantities of outflow at the upper levels of a thunderstorm indicate its development. Too much outflow in the lower levels of a thunderstorm, however, can choke off the low-level inflow which fuels it. [ 1 ]