AbstractA dataset of 88 recurving western North Pacific tropical cyclones from 2004-2015 is investigated for rainfall characteristics during their period of recurvature. The TCs are categorized into two groups based on different large-scale patterns from empirical orthogonal function analysis. Group 1 is characterized by an intense mid-latitude baroclinic zone and close distance between the zone and TC, while Group 2 is characterized by a weaker mid-latitude baroclinic zone and more remote distance between the zone and TC at the time of recurvature.The results show the large-scale environment has substantial impact on TC rainfall patterns. In Group 1, as the TC approaches and is embedded into the baroclinic zone, a relatively strong interaction between the TC and mid-latitudes occurs, which is reflected by a rapid increase of environmental vertical wind shear and TC translation speed, the alignment of the shear vector and motion vector, and a sharp contrast of temperature and moisture. Higher rainfall and wider coverage of rainfall tends to be produced along the track after recurvature, and the rainfall pattern turns from a right-of-track (ROT) preference to left-of-track (LOT). Conversely, in Group 2, a relatively weak interaction between the TC and mid-latitude circulation occurs, which is reflected by weaker VWS and slower TC motion, a separation of the shear vector and motion vector, and a weak gradient of temperature and moisture. The corresponding rainfall swath for Group 2 exhibits a narrower rainfall swath after recurvature. The rain pattern changes from a LOT to ROT preference.
Journal of Climate – American Meteorological Society
Published: Oct 30, 2017
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