TIPLE-DISCRIMINANT ANALYSIS OF CLEAR-AIR TURBULENCE,
Abstract
Screening multiple-discriminate analysis (MDA) is used to select specifiers for objectively analyzng clear-air turbulence (CAT) with the aid of an electronic computer. The data consist of a special 5-day collection of commercial and military aircraft reports of intensities of CAT and no CAT made by the Weather Bureau. In the analysis, volumes of space are classified with regard to CAT intensity for 6-hr intervals. The variables used to specify these classifications are obtained from 6- and 12-hourly radiosonde observations and upper-level charts. These include standard flow, shear, and stability parameters, both at the time of occurrence and for 6 hr prior to the occurrence. The MDA pro gram selected the height of the maximum wind level and the horizontal temperature gradient as the two specifiers best able to discriminate between categories of CAT. The significance of the selection of these specifiers in the light of the data sample used is discussed, and recommen dations are made for further work in turbulence, both in research and engineering areas. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1962
- Accession Number
- AD0413448
Entities
People
- John T. Ball