A Triple-Doppler Radar Analysis of a Discretely Propagating Multicell Convective Storm

Robert E. Peterson Jr. Department of Geophysical Sciences, The University of Chicago, Chicago, IL 60637

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Abstract

A triple-Doppler radar case study of a regularly propagating multicell convective storm has been performed. The motion of the storm, observed on 7 June 1978 during Project NIMROD, was somewhat unusual with cell translation and propagation directed opposite to one another. New cell formation is believed to have been caused by a directional outflow from existing cells which created a zone of low-level convergence favorable for convective growth. The unidirectional low to midlevel vertical shear of the growth environment, oriented roughly normal to the direction of cell translation, was found to strongly influence storm dynamics and structure.

Abstract

A triple-Doppler radar case study of a regularly propagating multicell convective storm has been performed. The motion of the storm, observed on 7 June 1978 during Project NIMROD, was somewhat unusual with cell translation and propagation directed opposite to one another. New cell formation is believed to have been caused by a directional outflow from existing cells which created a zone of low-level convergence favorable for convective growth. The unidirectional low to midlevel vertical shear of the growth environment, oriented roughly normal to the direction of cell translation, was found to strongly influence storm dynamics and structure.

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