Dual-Doppler observations of the formative stage of an asymmetric squall line system
Date
2002
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Texas A&M University
Abstract
The objective of this study is to document and explain the formation of a large asymmetric squall line system. Despite having a precipitation pattern similar to the conceptual model of an asymmetric squall line, the development and evolution of the storm system was considerably different from previous asymmetric squall line studies. Dual-Doppler data collected on 24-25 May 1997 during the TEXACAL field campaign revealed that the asymmetric squall line developed from the merging of two distinct squall lines oriented parallel to each other. The development of the trailing stratiform precipitation region and the evolution of the convection within the southern part of the convective line were influenced by the merging squall lines. The trailing stratiform region formed as dissipating convection in the northern portion of the western squall line merged with the developing stratiform precipitation region associated with the eastern squall line. Intense storm-relative rear inflow was present at the rear of the northern portion of the western squall line. A pronounced anticyclonic circulation associated with a bow echo along the leading edge of the southern portion of the western squall line affected the intensity of convection in the southern part of the domain as the flow entered the rear of the convective line and accelerated towards the leading edge causing intense upward motion and strong convection.
Description
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Includes bibliographical references (leaves 95-98).
Issued also on microfiche from Lange Micrographics.
Includes bibliographical references (leaves 95-98).
Issued also on microfiche from Lange Micrographics.
Keywords
atmospheric sciences., Major atmospheric sciences.