Elucidating the characteristics of eyewalls and rainbands associated with a severe typhoon influenced by Taiwan’s high orography using Doppler radar analysis

Wei, Chih-Hsien; Hor, Tai-Hwa; Wang, Jianliang

doi:10.1007/s00703-011-0133-0

Cited by 1 publication

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“…The phenomenon is as important as topographical effect to create the asymmetric distribution of rainbands embedded with in a TC system, which causes extreme difficulty in predicting intense wind and heavy rainfall in Taiwan. The TC-terrain interaction problem has led to plenty of significant studies, including numerical simulations (Wu and Kuo 1999;Wu 2001;Wu et al 2002;Lin et al 2002;Chiao and Lin 2003;Lin et al 2005;Jian and Wu 2008;Ge et al 2010;Chien and Kuo, 2011;Liang et al 2011) and observations (Hor et al 2005;Yu and Cheng 2008;Wei et al, 2011). In contrast, few systematic studies have been done on the TC interaction with the summer monsoon system (Lin et al 2011;Wu et al 2011;Chien and Kuo 2011).…”

Section: Introductionmentioning

confidence: 99%

Radar Analysis on the Interaction between Southwesterly Monsoonal Flow and Circulation Associated with Typhoon Morakot (2009)

Wei

Hor

Chuang

et al. 2012

Journal of the Meteorological Society of Japan

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This study investigates the mesoscale interaction of typhoon circulation and southwesterly flow during the passage of Typhoon Morakot (2009) over Taiwan using radar observations. Single Doppler radar analysis characterized typhoon features with remarkably distant rainbands, and identified the strong southwesterly monsoonal flow with a maximum speed of more than 45 m s -1 in the southern flank of distant rainbands. Dual-Doppler synthesized winds elucidated a confluent mechanism on the northern side of the rainbands with a maximum convergence over 1.5 × 10 -3 s -1 . Velocity azimuth display (VAD) winds showed the intensification of southwesterly flow at low levels. The southwesterly monsoonal flow initiated about 6 hrs before typhoon landfall, and then became prominently involved with typhoon circulation. Also, the radial component with respect to the typhoon center was enhanced and became comparable with the tangential one (~30 m s -1 ) about 7.5 hrs after landfall. The variation in intensity of radial components can be regarded as a unique precursor for the extension of influence of the southwesterly monsoonal flow onto the typhoon circulation. Furthermore, the strong convergence showed that the interaction between the southwesterly flow and typhoon circulation might contribute to the development of rainbands, as well as the intensification of the inward radial flow embedded within typhoon.

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