Accession Number : AD0282347

Title :   WEATHER RADAR RESEARCH AND APPLIED TECHNIQUES

Corporate Author : ALLIED RESEARCH ASSOCIATES INC BOSTON MASS

Personal Author(s) : BOUCHER,ROLAND J.

Report Date : 30 NOV 1961

Pagination or Media Count : 1

Abstract : Weather radar research on the development of short range forecast techniques are summarized. Objective techniques are outlined for utilizing PPI radarscope information in forecasting the onset of precipitation from echo lines, echo sheets with marked edges and armorphous echo fields. By means of an empirical study the degree of electrical activity in thunderstorms is shown to have a definite relationship to the intensity of the associated radar echo. A theoretical investigation of the observed high level reflectivity maximum in thunderstorms offers hail growth in restricted size intervals as a possible contributary effect. The importance of radar echo distribution with height to the correct interpretation of the change in the apparent size of echo patterns is theoretically demonstrated. Radar cross-sections and attenuations of rain based on more accurate and systematic calculations from the MIE theory, were calculated for different empirical drop size distributions. (Author)

Descriptors :   *METEOROLOGICAL RADAR, *RADAR CROSS SECTIONS, *WEATHER FORECASTING, EFFECTIVENESS, HAIL, LIGHTNING, METEOROLOGY, PLAN POSITION INDICATORS, RADAR EQUIPMENT, SNOW, STORMS, THEORY

Distribution Statement : APPROVED FOR PUBLIC RELEASE