Accession Number : AD0610713

Title :   THE DIAGNOSIS OF UPPER-AIR HUMIDITY FROM SURFACE OBSERVATIONS.

Descriptive Note : Technical rept. for Nov 63-Nov 64,

Corporate Author : UNITED AIRCRAFT CORP EAST HARTFORD CONN

Personal Author(s) : Ball,John T. ; Chisholm,Donald A. ; Luty,Paul ; Veigas,Keith W.

Report Date : JAN 1965

Pagination or Media Count : 197

Abstract : Northern-hemisphere surface-synoptic and radiosonde data from November, 1961 through February, 1962 are used to develop diagnostic relationships between surface-observed variables at a single station and the dewpoint spread at the 850-, 700-, 500-, and 400-mb levels above that station. The approach consists of two steps: (1) the isolation within a decision-tree framework of those cases for which surface-observed variables yield highly reliable estimates of upper-level humidity, and (2) the application of a statistical technique (Regression Estimation of Event Probabilities) to the remaining cases to derive equations yielding probabilities of occurence of specified categories of dew-point spread. This approach yields useful diagnostic information of variable quality. A method of incorporating this information into an objective analysis of humidity is outlined. The results of a feasibilitystudy assessing the value of using a network of stations to estimate upper-level humidity above a single station are given. Surface-synoptic data from a network surrounding Washington, D. C. (DCA) and radiosonde data from DCA for a forty-month period are used for the study. (Author)

Descriptors :   (*WEATHER FORECASTING, AIR FORCE), (*ATMOSPHERIC SOUNDING, HUMIDITY), (*HUMIDITY, UPPER ATMOSPHERE), (*METEOROLOGICAL PHENOMENA, STATISTICAL ANALYSIS), (*STATISTICAL ANALYSIS, METEOROLOGICAL PHENOMENA), NORTHERN HEMISPHERE, METEOROLOGY, METEOROLOGICAL INSTRUMENTS, DATA PROCESSING, FEASIBILITY STUDIES

Distribution Statement : APPROVED FOR PUBLIC RELEASE