Clear Air Turbulence analysis using isentropic methods.

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Author
Jacobson, John H.
Date
1986Advisor
Wash, C.H.
Second Reader
Renard, R.J.
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Show full item recordAbstract
Isentropic analyses were completed subjectively and by
the Petersen (1986) objective analysis scheme for a 24-h
Clear Air Turbulence (CAT) outbreak over the midwest United
States. The purpose of the study is to determine if areas
of high CAT potential could be identified by subjective
isentropic analyses, and then by the automated analyses
produced by the Petersen objective analyses. A background
of CAT theory and current CAT forecasting techniques are
also presented. The synoptic situation indicates the
importance of the jet stream structure in this case. The
study reveals that analyzed areas of low Ri and high wind
shear correspond very well to reports of CAT. The objective
analysis performance is fair overall. It shows a distinctive
weakness in the analysis of the wind speed,
occasionally producing spurious wind maxima. Analyses of
the mass field, frontal slope and Montgomery stream
function, are quite successful
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