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Numeric and fluid dynamic representation of tornadic double vortex thunderstorms

Author
Boaz, W.
Published
May 1, 1980.
Physical Description
1 electronic document
Additional Creators
Marquart, E. J., Connell, J. R., and Frost, W.
Online Version

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Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
Current understanding of a double vortex thunderstorm involves a pair of contra-rotating vortices that exists in the dynamic updraft. The pair is believed to be a result of a blocking effect which occurs when a cylindrical thermal updraft of a thunderstorm protrudes into the upper level air and there is a large amount of vertical wind shear between the low level and upper level air layers. A numerical tornado prediction scheme based on the double vortex thunderstorm was developed. The Energy-Shear Index (ESI) is part of the scheme and is calculated from radiosonde measurements. The ESI incorporates parameters representative of thermal instability and blocking effect, and indicates appropriate environments for which the development of double vortex thunderstorms is likely.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19840017149.
Accession ID: 84N25217.
NASA-CR-171023.
NAS 1.26:171023.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15707904