Single Doppler radar observation of the concentric eyewall in Typhoon Saomai, 2006, near landfall

AMS Citation:
Zhao, K., W. -C. Lee, and B. J. -D. Jou, 2008: Single Doppler radar observation of the concentric eyewall in Typhoon Saomai, 2006, near landfall. Geophysical Research Letters, 35, L07807, doi:10.1029/2007GL032773.
Date:2008-04-03
Resource Type:article
Title:Single Doppler radar observation of the concentric eyewall in Typhoon Saomai, 2006, near landfall
Abstract: Landfalling Typhoon Saomai (2006) was observed by the CINRAD WSR-98D radar on the southeast coast of China. This study documents the formation and evolution of a concentric eyewall episode using the axisymmetric circulation derived from the ground-based velocity track display technique. Saomai's outer eyewall formed after reaching its peak intensity, ~5 hours before landfall. Updraft, tangential wind maximum and shallow low-level inflow coincided with the high reflectivity and voriticity ring in both inner and outer eyewalls, surrounding a moat region characterized by weak downward motion and lower reflectivity. The subsidence and rain-free moat region between the two eyewalls was filled with rain and upward motion prior to landfall, indicating a breakdown in the outer eyewall which was a barrier to radial inflow. Meanwhile, the outer vorticity maximum flattened and the central pressure dropped 9 hPa. The eyewall replacement cycle didn't complete probably due to the landfall.
Subject(s):landfalling typhoon, Saomai, concentric eyewall, 3-D structures, moat region, CINRAD WSR-98D
Peer Review:Refereed
Copyright Information:An edited version of this paper was published by AGU. Copyright 2008 American Geophysical Union.
OpenSky citable URL: ark:/85065/d75b02ng
Publisher's Version: 10.1029/2007GL032773
Author(s):
  • Kun Zhao
  • Wen-Chau Lee - NCAR/UCAR
  • Ben Jou
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