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Lightning Activity Related to Satellite and Radar Observations of a Mesoscale Convective System over Texas on 7-8 April 2002

Dotzek, N. and Rabin, R.M. and Carey, L.D. and MacGorman, D.R. and McCormick, T.L. and Demetriades, N.W. and Murphy, M.J. and Holle, R.L. (2005) Lightning Activity Related to Satellite and Radar Observations of a Mesoscale Convective System over Texas on 7-8 April 2002. Atmospheric Research, 76, pp. 127-166. DOI: 10.1016/j.atmosres.2004.11.020.

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Official URL: http://www.elsevier.com/locate/atmos

Abstract

A multi-sensor study of the leading-line, trailing-stratiform (LLTS) mesoscale convective system (MCS) that developed over Texas in the afternoon of 7 April 2002 is presented. The analysis relies mainly on operationally available data sources such as GOES East satellite imagery, WSR-88D radar data and NLDN cloud-to-ground flash data. In addition, total lightning information in three dimensions from the LDAR II network in the Dallas–Ft. Worth region is used. GOES East satellite imagery revealed several ring-like cloud top structures with a diameter of about 100 km during MCS formation. The Throckmorton tornadic supercell, which had formed just ahead of the developing linear MCS, was characterized by a high CG+ percentage below a V-shaped cloud top overshoot north of the tornado swath. There were indications of the presence of a tilted electrical dipole in this storm. Also this supercell had low average CG- first stroke currents and flash multiplicities. Interestingly, especially the average CG+ flash multiplicity in the Throckmorton storm showed oscillations with an estimated period of about 15 min. Later on, in the mature LLTS MCS, the radar versus lightning activity comparison revealed two dominant discharge regions at the back of the convective leading edge and a gentle descent of the upper intracloud lightning region into the trailing stratiform region, apparently coupled to hydrometeor sedimentation. There was evidence for an inverted dipole in the stratiform region of the LLTS MCS, and CG+ flashes from the stratiform region had high first return stroke peak currents.

Document Type:Article
Title:Lightning Activity Related to Satellite and Radar Observations of a Mesoscale Convective System over Texas on 7-8 April 2002
Authors:
AuthorsInstitution or Email of Authors
Dotzek, N.UNSPECIFIED
Rabin, R.M.NOAA-NSSL, Norman, OK, USA
Carey, L.D.Texas A&M Univ., College Station, TX, USA
MacGorman, D.R.NOAA-NSSL, Norman, OK, USA
McCormick, T.L.North Carolina State Univ., Raleigh, NC, USA
Demetriades, N.W.Vaisala-Tucson Operations, Tucson, AZ, USA
Murphy, M.J.Vaisala-Tucson Operations, Tucson, AZ, USA
Holle, R.L.Vaisala-Tucson Operations, Tucson, AZ, USA
Date:2005
Journal or Publication Title:Atmospheric Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:76
DOI:10.1016/j.atmosres.2004.11.020
Page Range:pp. 127-166
Status:Published
Keywords:MCS, Schwergewitter, Blitz, Satellit, Radar , MCS; Severe thunderstorm; Lightning; Satellite; Radar
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: Ute Löb
Deposited On:17 Mar 2008
Last Modified:11 Nov 2014 21:55

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