主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

Journal of Meteorology and Environment ›› 2022, Vol. 38 ›› Issue (6): 29-38.doi: 10.3969/j.issn.1673-503X.2022.06.004

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The radar observation characteristics of multiple tornadoes in the peripheral circulation of two landfall typhoons in eastern coastal areas of China

Lu-lu WEN(),Rui HAN,Ji-rong ZHANG   

  1. Unit 93117 of the Chinese People's Liberation Army, Nanjing 210018, China
  • Received:2021-06-11 Online:2022-12-28 Published:2022-12-27

Abstract:

Using CINRAD/SA data, sounding data, automatic meteorological station data, and disaster reports, the environmental physical variations, tornado storm evolution, and mean radial velocity characteristics in the peripheral circulation of typhoon "Fung-wong" in the northern Jiangsu province and "Yagi" in northeast Shandong province were analyzed.The results show that the tornadoes occur in the northeast quadrant of the weakening low-pressure center of typhoon, and are characterized by small convective suppression energy, low lift condensation height, medium or strong convective available potential energy, strong low-level vertical wind shear, and large storm-relative helicity.Tornado storms mostly occur in the convective cloud belts in the peripheral circulation of a typhoon and appear as relatively isolated convective cells in small numbers.The multiple tornadoes in the peripheral circulation of typhoon "Fung-wong" occur in thunderstorms at the back of the cloud belt, and the tornado monomer has the characteristics of backward propagation.The multiple tornadoes in the peripheral circulation of typhoon "Yagi" are mainly caused by thunderstorms in the front of the cloud belt and have a long life and persistent mesocyclone.The storms have large velocity differences between adjacent velocity gate pairs at low-level at the tornadoes occurring stage and are accompanied by a significant small-scale vortex.Before the tornadoes occurring stage, the low-level cyclonic vortex of the storm is strengthened significantly and maintained, and then is quickly moved down to the storm bottom where the cyclonic vortex is strengthened significantly.After the cyclonic vortex reaches a particular intensity, tornadoes appear on the ground.

Key words: Multiple tornadoes, Environmental parameters, Small scale vortex, Shear

CLC Number: