A Metric for Rainfall Asymmetry in Recurving Tropical Cyclones

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Using a data set of 138 recurving tropical cyclones (TCs) from 2004 to 2015 in the western North Pacific, a new metric, Brain, is proposed, which quantifies the asymmetry in the rainfall within the TC circulation relative to its track. When Brain is positive (negative), the rainfall has a right of track (left of track) preference. Using the new metric, the rainfall asymmetry is found to be closely related to thermal structure asymmetry (B) in TCs. A well-defined anticorrelated relationship is found between Brain and B for all recurving TCs. Prior to recurvature, Brain decreases linearly as B increases. After recurvature, the linear relationship weakens, and TC rainfall is almost entirely concentrated left of track as B increases. A phase-space composed of Brain and B provides substantial insight into cyclone structural and rainfall asymmetric evolution.

Original languageEnglish (US)
Pages (from-to)6741-6749
Number of pages9
JournalGeophysical Research Letters
Issue number13
StatePublished - Jul 16 2018


  • metric
  • rainfall asymmetry
  • recurving tropical cyclones

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)


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