Analysis on the Evolution Characteristics of Storm Parameters and ZDR Column for Two Long Life Supercells

Xiuguang DIAO; Chuanfeng YANG; Qian ZHANG; Qingli Lü

doi:10.7522/j.issn.1000-0534.2020.00034

Plateau Meteorology >

2021 , Vol. 40 >Issue 3: 580 - 589

DOI: https://doi.org/10.7522/j.issn.1000-0534.2020.00034

Analysis on the Evolution Characteristics of Storm Parameters and Z_DR Column for Two Long Life Supercells

Xiuguang DIAO ,
Chuanfeng YANG ,
Qian ZHANG ,
Qingli Lü

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Shandong Meteorological Observatory,Jinan 250031,Shandong,China

Received date: 2019-11-25

Online published: 2021-06-28

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Abstract

Based on the S-band dual-polarization Doppler weather radar data of Jinan， combined with sounding and ground data， the evolution characteristics of storm parameters and Z_DR column of two long-lived supercells are analyzed.The results show that the two processes have strong thermodynamic instability， medium or above intensity of CAPE and vertical wind shear from 0 to 6 km， which is conducive to the generation and maintenance of highly organized storms.The two supercell storms lasted for more than 4 hours， and the high reflectivity factor （≥60 dBZ） maintained for more than 3 hours， the average DBZM value was 65.8 dBZ， at the same time， both supercell storms had large C-VIL.The moving direction of the two strong storms is basically the same， but the difference of moving speed is obvious.The main factor leading to the difference of moving speed is the difference of guiding airflow of 500 hPa.The Z_DR column is the Z_DR high value area above the environmental 0 ℃ level and located in the strong updraft zone of the storm， indicating a small number of large oblate raindrops and a few horizontally oriented wet ice particles.The existence of mixed phase particles in Z_DR column leads to low CC.The storm developed rapidly after the appearance of Z_DR column and weakened gradually after the disappearance of Z_DR column.Z_DR column can be used as one of the early warning of hail.The appearance of Z_DR column indicates that the strength and height of the updraft in the storm increase， which indicates that the storm will develop rapidly.The disappearance of Z_DR column indicates that the intensity and the height of updraft in the storm will decrease， and indicates that the centroid of the storm will be reduced and the intensity of the storm will be weakened.The top of the Z_DR column of the two storms is obviously different， but there is no significant difference between the top of the Z_DR column and the height of 0 ℃ layer.

Key words： Supercell; updraft; Z_DR; difference

Cite this article

Xiuguang DIAO , Chuanfeng YANG , Qian ZHANG , Qingli Lü . Analysis on the Evolution Characteristics of Storm Parameters and Z_DR Column for Two Long Life Supercells[J]. Plateau Meteorology, 2021 , 40(3) : 580 -589 . DOI: 10.7522/j.issn.1000-0534.2020.00034

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