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Downburst-producing thunderstorms in southern Germany: Radar analysis and predictability

Dotzek, Nikolai and Friedrich, Katja (2009) Downburst-producing thunderstorms in southern Germany: Radar analysis and predictability. Atmospheric Research, 93 (1-3), pp. 457-473. Elsevier. DOI: 10.1016/j.atmosres.2008.09.034.

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Official URL: http://www.sciencedirect.com/science/journal/01698095

Abstract

Three days with downburst-producing thunderstorms during the VERTIKATOR intensive observation period in June and July 2002 are studied by means of the C-band polarisation diversity radar POLDIRAD and its network of three bistatic receivers.We present the first wind vector fields from a downburst measured by such a bistatic network. The polarimetric radar data allowed testing the recent hypothesis that a dominant trigger mechanism for wet downbursts might be the cooling due to melting of small hail or graupel in the storm, and we found some evidence for this process in the VERTIKATOR storms. This could be exploited by polarimetric radar nowcasting algorithms for downburst detection. The predictability of the downburst potential was further investigated from proximity soundings and their derived indices WINDEX as well as different formulations of GUSTEX. In particular, a new formulation of GUSTEX is proposed here which shows promising predictive skill for the VERTIKATOR cases and a number of other severe (and non-severe) situations from the same region in southern Germany.

Document Type:Article
Title:Downburst-producing thunderstorms in southern Germany: Radar analysis and predictability
Authors:
AuthorsInstitution or Email of Authors
Dotzek, NikolaiUNSPECIFIED
Friedrich, KatjaUniv. of Colorado, USA
Date:2009
Journal or Publication Title:Atmospheric Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:93
DOI:10.1016/j.atmosres.2008.09.034
Page Range:pp. 457-473
Publisher:Elsevier
Status:Published
Keywords:Downburst, radar, predictability, WINDEX, GUSTEX
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Dr.rer.nat. Nikolai Dotzek
Deposited On:27 Aug 2009 11:54
Last Modified:12 Dec 2013 20:41

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