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Ageostrophic winds in the severe strom environmentThe period from 1200 GMT 10 April to 0000 GMT 11 April 1979, during which time several major tornadoes and severe thunderstorms, including the Wichita Falls tornado occurred was studied. A time adjusted, isentropic data set was used to analyze key parameters. Fourth order centered finite differences were used to compute the isallobaric, inertial advective, tendency, inertial advective geostrophic and ageostrophic winds. Explicit isentropic trajectories were computed through the isentropic, inviscid equations of motion using a 15 minute time step. Ageostrophic, geostrophic and total vertical motion fields were computed to judge the relative importance of ageostrophy in enhancing the vertical motion field. It is found that ageostrophy is symptomatic of those mass adjustments which take place during upper level jet streak propagation and can, in a favorable environment, act to increase and release potential instability over meso alpha time periods.
Document ID
19830009118
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Moore, J. T.
(Saint Louis Univ. MO, United States)
Date Acquired
August 11, 2013
Publication Date
August 1, 1982
Publication Information
Publication: NASA. Marshall Space Flight Center The 1982 NASA(ASEE Summer Fac. Fellowship Program
Subject Category
Meteorology And Climatology
Accession Number
83N17389
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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