The Multiple-Vortex Structure of the El Reno, Oklahoma, Tornado on 31 May 2013

Bluestein, Howard B.; Thiem, Kyle J.; Snyder, Jeffrey C.; Houser, Jana B.

doi:10.1175/MWR-D-18-0073.1

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The Multiple-Vortex Structure of the El Reno, Oklahoma, Tornado on 31 May 2013

2018
By Bluestein, Howard B. ; Thiem, Kyle J. ; Snyder, Jeffrey C. ; ...
Source: Monthly Weather Review, 146(8), 2483-2502

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Journal Title:

Monthly Weather Review
Personal Author:

Bluestein, Howard B. ; Thiem, Kyle J. ; Snyder, Jeffrey C. ; Houser, Jana B.

Bluestein, Howard B. ; Thiem, Kyle J. ; Snyder, Jeffrey C. ; Houser, Jana B. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; NSSL (National Severe Storms Laboratory) ; NWS (National Weather Service)

OAR (Oceanic and Atmospheric Research) ; NSSL (National Severe Storms Laboratory) ; NWS (National Weather Service) Less -
Description:

This study documents the formation and evolution of secondary vortices associated within a large, violent tornado in Oklahoma based on data from a close-range, mobile, polarimetric, rapid-scan, X-band Doppler radar. Secondary vortices were tracked relative to the parent circulation using data collected every 2 s. It was found that most long-lived vortices (those that could be tracked for ≥15 s) formed within the radius of maximum wind (RMW), mainly in the left-rear quadrant (with respect to parent tornado motion), passing around the center of the parent tornado and dissipating closer to the center in the right-forward and left-forward quadrants. Some secondary vortices persisted for at least 1 min. When a Burgers–Rott vortex is fit to the Doppler radar data, and the vortex is assumed to be axisymmetric, the secondary vortices propagated slowly against the mean azimuthal flow; if the vortex is not assumed to be axisymmetric as a result of a strong rear-flank gust front on one side of it, then the secondary vortices moved along approximately with the wind.
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Radars/Radar Observations Supercells Tornadoes
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Monthly Weather Review, 146(8), 2483-2502
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https://doi.org/10.1175/MWR-D-18-0073.1
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Journal Article
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urn:sha256:f1ea0eae981fd10da219f916c9768470b9ed30e94a5f253e45c36c71e6159dd4
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https://repository.library.noaa.gov/view/noaa/32227/noaa_32227_DS1.pdf
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The Multiple-Vortex Structure of the El Reno, Oklahoma, Tornado on 31 May 2013

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