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The terminal area simulation system. Volume 2: Verification casesThe numerical simulation of five case studies are presented and are compared with available data in order to verify the three-dimensional version of the Terminal Area Simulation System (TASS). A spectrum of convective storm types are selected for the case studies. Included are: a High-Plains supercell hailstorm, a small and relatively short-lived High-Plains cumulonimbus, a convective storm which produced the 2 August 1985 DFW microburst, a South Florida convective complex, and a tornadic Oklahoma thunderstorm. For each of the cases the model results compared reasonably well with observed data. In the simulations of the supercell storms many of their characteristic features were modeled, such as the hook echo, BWER, mesocyclone, gust fronts, giant persistent updraft, wall cloud, flanking-line towers, anvil and radar reflectivity overhang, and rightward veering in the storm propagation. In the simulation of the tornadic storm a horseshoe-shaped updraft configuration and cyclic changes in storm intensity and structure were noted. The simulation of the DFW microburst agreed remarkably well with sparse observed data. The simulated outflow rapidly expanded in a nearly symmetrical pattern and was associated with a ringvortex. A South Florida convective complex was simulated and contained updrafts and downdrafts in the form of discrete bubbles. The numerical simulations, in all cases, always remained stable and bounded with no anomalous trends.
Document ID
19870010819
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Proctor, F. H.
(Mesoscale Environmental Simulations and Operations, Inc. Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
April 1, 1987
Publication Information
Publisher: NASA
Subject Category
Air Transportation And Safety
Report/Patent Number
NAS 1.26:4047
NASA-CR-4047
DOT/FAA/PM-86/50-VOL-2
Accession Number
87N20252
Funding Number(s)
CONTRACT_GRANT: NAS1-17409
PROJECT: RTOP 505-67-41
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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