High winds generated by bow echoes. Part II: The relationship between the mesovortices and damaging straight-line winds

AMS Citation:
Wakimoto, R. M., H. V. Murphey, C. A. Davis, and N. T. Atkins, 2006: High winds generated by bow echoes. Part II: The relationship between the mesovortices and damaging straight-line winds. Monthly Weather Review, 134, 2813-2829, doi:10.1175/MWR3216.1.
Date:2006-10-01
Resource Type:article
Title:High winds generated by bow echoes. Part II: The relationship between the mesovortices and damaging straight-line winds
Abstract: Airborne radar analysis of a mesovortex that developed near the apex of a bow echo is presented. The mesovortex was shown to play a critical role in determining the location of intense "straight-line" wind damage at the surface. The perturbation pressure gradient force (in natural coordinates) along the parcel path accelerated the horizontal winds; however, intense mesovortices modified the low-level outflow and largely determined the locations where the strongest winds occurred. Regions of maximum winds are accounted for as a superposition of the vortex and the flow in which it is embedded. The strongest winds occur on the side of the vortex where translation and rotation effects are in the same direction. This model explains the observed tongue of high wind speeds that were confined to the periphery of the mesovortex. The origin of the mesovortex is also examined. Similarities and differences of this bow echo event with recent modeling studies are presented.
Subject(s):Severe storms, Convective storms, Vortices, Wind
Peer Review:Refereed
Copyright Information:Copyright 2006 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/d7sq90pw
Publisher's Version: 10.1175/MWR3216.1
Author(s):
  • Roger Wakimoto - NCAR/UCAR
  • Hanne Murphey
  • Christopher Davis - NCAR/UCAR
  • Nolan Atkins
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