Squall line weather system sweeps across the Pearl River Delta with strong winds and thunderstorms

Original headline: Severe convective weather hits Shunde, Guangdong; wind disaster injures 23 people

On the 12th, a squall line weather system swept across the Pearl River Delta region, with Foshan, Guangzhou, Shenzhen and other places hit by short-term heavy rainfall, thunderstorm gales and other severe convective weather.

The severe convective weather caused a wind disaster in Lecong Town, Shunde District, Foshan. The Shunde District government reported that, hit by force-10 gusty winds, 23 people in 5 villages and communities in Lecong Town suffered minor injuries, some factory buildings and trees were damaged, and 3,525 electricity users in 4 villages and communities lost power; no reports of serious injuries or deaths have been received so far. The meteorological department reminds that Guangdong has entered a period of frequent severe convective weather, and attention must be paid to guarding against disasters such as the collapse of factory sheds, temporary structures, outdoor billboards and trees caused by local lightning, thunderstorm gales and other severe convective weather. (According to Xinhua News Agency, Guangzhou, April 12 dispatch, reporter Tian Jianchuan)

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What is "squall line weather"

A squall line (English: Squall line), sometimes also called a line squall, refers to a meso-to-small-scale severe convective weather phenomenon formed by a band of thunderstorm clusters that produces sudden changes in wind direction and wind speed, usually accompanying or preceding a cold front. Its destructive power is very strong. Squall lines are mostly produced when cold air moves into a warm, humid area, creating a pattern of cold aloft and warm below, making the thermal structure of the upper and lower troposphere different and generating high-intensity severe convective weather. The thunderstorms on a squall line are usually composed of several thunderstorm cells, and therefore can produce violent weather changes. In the early 20th century, squall line was usually used as a synonym for cold front. The typical phenomena when a squall line passes are a sudden change in wind direction, a rapid increase in wind speed, a sudden rise in air pressure and sharp changes in temperature; at the peak stage, the average wind force is above force 10, and gusts exceed force 12. It may also be accompanied by thunderstorms, heavy rain, hail, strong straight-line winds, tornadoes and waterspouts. A squall line usually has typical bow-shaped characteristics and is accompanied by strong straight-line winds. Tornadoes may exist along wave-shaped linear echoes when a mesoscale low-pressure area is present. In summer, bow echoes may develop into super-severe convective storms and pass through large areas at extremely high speed. The rear edge of the rain-shield masking portion is usually accompanied by a mature squall line, with a wake low, and sometimes even a heat burst. The horizontal extent of a squall line is very small, with a length usually only 150-300 km, a width of only half a kilometer to several dozen kilometers, and a height of only about 3 km. Its duration is generally 4-10 hours.

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