AbstractThis study investigated the characteristics of the rainfall associated with tropical cyclones (TCs), using the TC best-trackdata and daily rainfall data from 15 meteorological stations forthe period 1961−2008 for the coastal region of Vietnam. In addition to investigating the TC rainfall amount, we estimated theTC rain ratio and the ratio of TC heavy rainfall days (TC_R50)and interpreted these parameters for El Niño and La Niña years.Our results show that the maximum TC rainfall occurs from Julyto September in the northern region, whereas the total rainfallat southern stations is mainly composed of non-TC rainfall. TheTC rainfall amount is concentrated in the central region, with apeak in October-November. The TC rain ratio varies from 0 to~25%, showing a maximum value in the region of 16°N−18°Nin September. The mid-central region of Vietnam has maximumTC_R50 ratio in September-October corresponding to its highestTC frequency in the same period. During El Niño (La Niña) years,the TC rain ratio and TC_R50 ratio in the central region show asignificant decrease (increase) in October-November. The La Niñaphases more strongly affect TC rainfall than the El Niño phases,particularly in central Vietnam.
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