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ANALYSIS OF MESOSCALE STRUCTURE IN ANTICYCLONIC JET-STREAM FLOW
MELPAR INC WATERTOWN MASS
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This analysis was conducted to gain scientific knowledge about certain atmospheric phenomena associated with the jet stream and to present the findings in a manner which will encourage further research. Data obtained primarily from four Project Jet Stream aircraft flights in upper-air ridges located over northeastern United States were evaluated. Ridge jet-stream characteristics are illustrated and discussed and a composite cross section of the four flights is presented. Wind measurements made by the aircraft are compared with geostrophic and gradient winds computed from upper-air charts and the geostrophic and gradient wind departures so determined are presented. Gradient winds were found better than the geostrophic as an approximation to observed winds in the vicinity of an anticyclonic jet stream. The statistical significance of the departures is discussed. Conclusions and recommendations include suggestions for further development of categorizing turbulence with specific atmospheric conditions. Also recommended is the application of objective statistical techniques for forecasting the probability of turbulence occurrences under given conditions. Author
APPROVED FOR PUBLIC RELEASE