An orography-associated extreme rainfall event during TiMREX: Initiation, storm evolution, and maintenance

AMS Citation:
Xu, W., E. J. Zipser, Y. -L. Chen, C. Liu, Y. -C. Liou, W. -chau Lee, and B. J. -D. Jou, 2012: An orography-associated extreme rainfall event during TiMREX: Initiation, storm evolution, and maintenance. Monthly Weather Review, 140, 2555-2574, doi:10.1175/MWR-D-11-00208.1.
Date:2012-08-01
Resource Type:article
Title:An orography-associated extreme rainfall event during TiMREX: Initiation, storm evolution, and maintenance
Abstract: This study investigates a long-duration mesoscale system with extremely heavy rainfall over southwest Taiwan during the Terrain-influenced Monsoon Rainfall Experiment (TiMREX). This mesoscale convective system develops offshore and stays quasi-stationary over the upstream ocean and southwest coast of Taiwan. New convection keeps developing upstream offshore but decays or dies after moving into the island, dropping the heaviest rain over the upstream ocean and coastal regions. Warm, moist, unstable conditions and a low-level jet (LLJ) are found only over the upstream ocean, while the island of Taiwan is under the control of a weak cold pool. The LLJ is lifted upward at the boundary between the cold pool and LLJ. Most convective clusters supporting the long-lived rainy mesoscale system are initiated and develop along that boundary. The initiation and maintenance is thought to be a "back-building--quasi-stationary" process. The cold pool forms from previous persistent precipitation with a temperature depression of 2°-4°C in the lowest 500 m, while the high terrain in Taiwan is thought to trap the cold pool from spreading or moving. As a result, the orography of Taiwan is "extended" to the upstream ocean and plays an indirect effect on the long-duration mesoscale system.
Subject(s):Mesoscale systems, Topographic effects, Precipitation
Peer Review:Refereed
Copyright Information:Copyright 2012 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work.
OpenSky citable URL: ark:/85065/d7qr4xv4
Publisher's Version: 10.1175/MWR-D-11-00208.1
Author(s):
  • Weixin Xu
  • Edward Zipser
  • Yi-Leng Chen
  • Chuntao Liu
  • Yu-Chieng Liou
  • Wen-chau Lee - NCAR/UCAR
  • Ben Jou
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