LAYER OF MAXIMUM WIND ANALYSIS TECHNIQUE
Final rept. 1 Oct 1965-15 Jul 1966
TRAVELERS RESEARCH CENTER INC HARTFORD CT
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An objective layer of maximum wind LRMW analysis technique is described and evaluated. The evaluation indicates that the technique represents a significant improvement over the previously developed level of maximum wind LMW analysis technique Spiegler, D. B., and J. T. Ball, et al., 1965 techniques for objective hemispheric analysis and prediction of the jet stream AD-622 711. A categorization procedure for wind profiles that results in nine jet stream categories is designed and used for the derivation of regression equations that supply the initial-guess fields for each of five LRMW parameters. The stratification of the profiles into nine categories is a refinement of the previous seven categories developed for the LMW analysis technique. The initial-guess LRMW equations are stable in tests with independent data and are capable of specifying, very well, the general characteristics of the LRMW profile. They also provide realistic values for the LRMW parameters over no- data areas that are consistent with the entire analysis area. The analysis technique locates jet cores between grid points and generates observations along these cores by using models of horizontal jet profiles. Thickness of the LRMW as one of the analysis fields in conjunction with the windspeed maximum, mean height of the LRMW, and vector shears below and above the LRMW enable the generation of a three-dimensional picture of the wind field in the vicinity of the jet stream. Over the data areas, where a comparison between objective and subjective analyses can be made, the objective LRMW analyses compare favorably with the subjective analyses.