Observational analysis of heavy rainfall mechanisms associated with severe tropical storm Bilis (2006) after its landfall

Shuanzhu Gao, Zhiyong Meng, Fuqing Zhang, Lance F. Bosart

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

This observational study attempts to determine factors responsible for the distribution of precipitation over large areas of southern China induced by Bilis, a western North Pacific Ocean severe tropical storm that made landfall on the southeastern coast of mainland China on 14 July 2006 with a remnant circulation that persisted over land until after 17 July 2006. The heavy rainfalls associated with Bilis during and after its landfall can be divided into three stages. The first stage of the rainfall, which occurred in Fujian and Zhejiang Provinces, could be directly induced by the inner-core storm circulation during its landfall. The third stage of rainfall, which occurred along the coastal areas of Guangdong and Fujian Provinces, likely resulted from the interaction between Bilis and the South China Sea monsoon enhanced by topographical lifting along the coast. The second stage of the rainfall, which appeared inland around the border regions between Jiangxi, Hunan, and Guangdong Provinces, caused the most catastrophic flooding and is the primary focus of the current study. It is found that during the second stage of the rainfall all three ingredients of deep moist convection (moisture, instability, and lifting) are in place. Several mechanisms, including vertical wind shear, warm-air advection, frontogenesis, and topography, may have contributed simultaneously to the lifting necessary for the generation of the heavy rainfall at this stage.

Original languageEnglish (US)
Pages (from-to)1881-1897
Number of pages17
JournalMonthly Weather Review
Volume137
Issue number6
DOIs
StatePublished - Aug 12 2009

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rainfall
frontogenesis
inner core
border region
coast
wind shear
analysis
advection
monsoon
flooding
convection
moisture
topography
air
province

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

Gao, Shuanzhu ; Meng, Zhiyong ; Zhang, Fuqing ; Bosart, Lance F. / Observational analysis of heavy rainfall mechanisms associated with severe tropical storm Bilis (2006) after its landfall. In: Monthly Weather Review. 2009 ; Vol. 137, No. 6. pp. 1881-1897.
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Observational analysis of heavy rainfall mechanisms associated with severe tropical storm Bilis (2006) after its landfall. / Gao, Shuanzhu; Meng, Zhiyong; Zhang, Fuqing; Bosart, Lance F.

In: Monthly Weather Review, Vol. 137, No. 6, 12.08.2009, p. 1881-1897.

Research output: Contribution to journalArticle

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