Squall line
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A squall line, or quasi-linear convective system, 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. Li
Shelf cloud on the leading edge of a derecho as photographed in Minnesota
Squall
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A squall is a sudden, sharp increase in wind speed lasting minutes, as opposed to a wind gust, which lasts for only seconds. They are usually associated with active weather, such as rain showers, thun
Squall line
…northern end may evolve further, creating a "comma shaped" wake low, or may continue in a squall-like pattern. The updraft ahead of the line create a mesolow too while the downdraft just behind the line will produce a mesohigh. Wind shear is an important aspect of a squall line. In low to medium shear…
A summer squall line in Southern Ontario, producing lightning and distant heavy rains.