What is a squall line? Why do squall lines easily cause extreme weather and meteorology such as hail?

A squall line is a group of thunderstorms arranged in bands. On the radar, it shows a narrow red echo, like a red snake scanning. Therefore, if red is a mass, it is not called a squall line. Only when it is connected into a narrow line can it be called a squall line.

Squall lines are generally tens to hundreds of kilometers long and tens to 200 kilometers wide. A few hours to ten hours. Of course, this refers to the whole squall line. It usually takes less than an hour to get to a certain place. It's like, you were suddenly knocked unconscious, and by the time you realized it, the squall line had passed. The biggest feature of strong convective weather is its great destructive power and short duration.

Squall lines can bring thunderstorms, strong winds, hail and even tornadoes. Short-term heavy rainfall will bring about a rapid drop in temperature. Yancheng, Jiangsu Province was hit by a rare tornado once in 50 years, killing 78 people and injuring nearly 500 others. The final conclusion is a tornado. 454 people were killed in the East Xinghai disaster, 12 survived. At first it was considered as a tornado, and finally it was considered as a downburst. Therefore, squall line, tornado and downburst are all strong convective weather, and the final conclusion can only be drawn through data analysis afterwards.

A squall line refers to a narrow strong convection area with a short life history and sudden changes in air pressure and wind power. To put it bluntly, it is a banded thunderstorm. You can compare a super convection cell to a hawthorn. A squall line is a lot of hawthorn strung together, and it is always strong weather wherever you go.

Squall line (English: squall line), sometimes called squall line. Refers to the small and medium-scale strong convective weather with sudden changes in wind direction and wind speed, usually accompanied or preceded by a cold front. Extremely destructive. The squall line is mostly caused by cold air moving to warm and humid areas, which makes the thermal structure of the upper and lower troposphere different and produces strong convective weather. Thunderstorms on squall lines usually consist of several thunderstorm cell, so there will be drastic weather changes. Squall lines are often used as synonyms for cold fronts. The typical phenomena in the process of squall line crossing are sudden change of wind direction, sharp increase of wind speed, sudden increase of air pressure and sharp change of temperature. In its heyday, the average wind force was above 10, and the gust was above 12.

It may also be accompanied by thunderstorms, heavy rains, hail, strong winds, tornadoes and tornadoes at sea. Squall lines usually have typical bow characteristics, accompanied by strong winds. When the mesoscale low pressure zone exists, the tornado may exist along the waveform linear echo. In summer, the bow echo may develop into a super convective storm and pass through a large area at a very high speed. The trailing edge of rain curtain is usually accompanied by mature squall line, low wake pressure and sometimes even thermal storm flow. The horizontal range of the squall line is very small, usually the length is only 150~300 kilometers, the width is only half a kilometer to dozens of kilometers, and the height is only about 3 kilometers. Its maintenance time is generally 4~ 10 hour.