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Doppler radar observation, CG lightning activity and aerial survey of a multiple downburst in southern Germany on 23 March 2001

Dotzek, Nikolai and Lang, Peter and Hagen, Martin and Fehr, Thorsten and Hellmiss, Werner (2007) Doppler radar observation, CG lightning activity and aerial survey of a multiple downburst in southern Germany on 23 March 2001. Atmospheric Research, 83, pp. 519-533. DOI: 10.1016/j.atmosres.2005.08.016.

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Official URL: http://dx.doi.org/10.1016/j.atmosres.2005.08.016

Abstract

Two downburst events from one thunderstorm are investigated, which occurred on 23 March 2001, in Germany's climatologic annual minimum of downburst activity. Observations by two Doppler radars are combined with hail reports, ground lightning detection and an aerial survey conducted after the event. The downburst-producing storm had formed at a synoptic convergence line within the warm sector of a cyclone. It had a remarkably high propagation speed of up to 31 m s−1 corresponding to the midtropospheric flow. Thus, by superposition with the storm motion, even two weak downbursts were sufficient to cause the observed damage of F1 and F2 intensity, respectively. While in its late stages, the storm was dynamically characterized by lower- and midtropospheric divergence; at about the time of the first downburst, a mesocyclonic vortex signature was verified. Aside from midtropospheric dry air entrainment, a thermodynamic explanation for the triggering of the two downbursts by melting of small hail according to recent findings by Atlas et al. [Atlas, D., Ulbrich, C.W., Williams, C.R., 2004. Physical origin of a wet microburst: observations and theory. J. Atmos. Sci. 61, 1186–1196] appears probable. Despite the lack of warnings to the public, the storm's potential for hail and strong straight-line winds was detected by the German weather service radar software CONRAD more than a half hour before the downbursts occurred.

Document Type:Article
Title:Doppler radar observation, CG lightning activity and aerial survey of a multiple downburst in southern Germany on 23 March 2001
Authors:
AuthorsInstitution or Email of Authors
Dotzek, NikolaiUNSPECIFIED
Lang, PeterDWD MOHP, Hohenpeißenberg
Hagen, MartinUNSPECIFIED
Fehr, ThorstenESA-ESRIN, Frascati, I
Hellmiss, WernerDWD, München
Date:2007
Journal or Publication Title:Atmospheric Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:83
DOI:10.1016/j.atmosres.2005.08.016
Page Range:pp. 519-533
Status:Published
Keywords:Thunderstorm, Downburst, Radar, Lightning, Aerial survey
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:22 Feb 2007
Last Modified:20 Oct 2014 14:31

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