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Characteristics of Lightning Activity and Radar Reflectivity during Typhoon 'Morakot' Landfall

Journal

Plateau Meteorology

Authors

Wen Ying, Zhao Yang, Zhao Guo, Kong Xiangzhen

Year

2015

Volume

34

Issue

3

Pages

832 -841

Corresponding Author

Wen, Y

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wenying@lzb.ac.cn

Keywords

Typhoon 'Morakot'; Lightning; Radar reflectivity; Vertical upflow

Abstract

Using the lightning data from World Wide Lightning Location Network (WWLLN), typhoon track and intensity data from the Best Track Data Sets (CMA), radar reflectivity of the weather radar from Fujian Meteorological Administration and the NCEP/NCAR Global Reanalysis Data, to analyze the characteristics of lightning activity and radar reflectivity in typhoon 'Morakot' (0908)during the two processes of landfall in Taiwan and Fujian. The analysis showed that more lightning occurred in the outer rainband and less lightning occurred in the central area and inner rainband. The first landfall in Taiwan caused more lightning than the second landfall in Fujian. At 6 km height, lightning was prone to occur in the rear or round of the central area where the reflectivity value was high and the area was large. The lightning number was low at the beginning of echo formation, and increased when the convective systems developed stably. During the period of typhoon entered into Taiwan Strait and made landfall in Fujian, the maximum echo height and lightning number had a positive correlation.The lightning activity was affected by both the vertical movement and topography. Lightning concentrated on the land at the rear side area of cyclonic horizontal wind flowed into the vertical upflow central areas on 500 hPa. The position and intensity of the vertical upflow central areas influenced the position and number of lightning activity.
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