“艾云尼”台风龙卷天气过程分析

doi:10.3969/j.issn.1673-503X.2020.02.003

Abstract

Abstract:

Based on the data from the conventional and automatic weather stations, Doppler radar, network videos, the disaster investigation and so on, the tornado weather process of No.1804 Ewiniar typhoon was analyzed.The results show that the tornado occurs on the right and rear side of the direction of typhoon Ewiniar after landing, with a strength level of EF1.The favorable circulation background includes the divergence suction at a high level, strong southeasterly jet stack at the middle and low level, and the lifting trigger of the mesoscale convergence line at the ground.The properties of atmosphere convective parameters are weak convective available potential energy and convective inhibitory energy, strong vertical wind shear at a low level, and low elevation condensation height and large relative helicity of a storm.The convective storm that produced the tornado is a low-mass micro-supercell one, and the tornado appears in the weak echo area of hook echo.On the velocity diagram, the meso-cyclone appears about 30 min ahead.The rotation speed of the meso-cyclone increases to the largest level near the occurrence of a tornado.Its size decreases, and its bottom height reaches to the minimum.All of these have a certain indicating effect for the early warning of the tornado.

Key words: Typhoon-tornado, Environmental background, Radar echo characteristics, Meso-cyclone

CLC Number:

P458.3

Jiang-ling ZHI. Analysis of the tornado weather process of Ewiniar typhoon[J]. Journal of Meteorology and Environment, 2020, 36(2): 20-27.

Figures/Tables 8

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损毁级别	灾情描述	风速期望值	风速最小值	风速最大值	期望值对应的EF级别
1	可计损失的起始值	30.0	24.0	37.1	EF0
2	卷叶门向内或向外垮塌	39.8	33.5	48.3	EF1
3	铁制的屋顶或墙体铁板吹飞	42.5	34.9	53.6	EF1
4	柱锚固脱落	52.3	42.9	60.3	EF2
5	房顶的檩条垮塌	52.7	42.5	61.7	EF2
6	侧面X型负载支架倒塌	61.9	52.7	70.6	EF3
7	房屋的钢架结构垮塌	63.9	53.6	75.1	EF3
8	整个房屋完全垮塌	69.3	59.0	79.6	EF3

环境参数	清远	香港
对流有效位能/(J·kg^-1)	26.4	1694.4
对流抑制/(J·kg^-1)	0.1	2.1
抬升凝结高度/m	0	116
0—1 km风垂直切变/(10^-3·s^-1)	14.2	13.1
0—6 km风垂直切变/(10^-3·s^-1)	2.3	2.5
风暴相对螺旋度/(m²·s²)	364	237

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Analysis of the tornado weather process of Ewiniar typhoon

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