Accession Number : AD0432778

Title :   CHARACTERISTICS OF NEW ENGLAND THUNDERSTORMS VIEWED ON 10 CM RADAR,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : Stem,Taylor Frank ,Jr.

Report Date : 20 JAN 1964

Pagination or Media Count : 176

Abstract : Thunderstorms were observed with a 10 cm radar during the summer of 1963. The radar observations of seven thunderstorm situations which occurred in June were analysed and studied in conjunction with the routinely observed and analysed synoptic data. Each thunderstorm case was described separately and the most general characteristics were presented and discussed. The following features were noted: 1) The storms in all seven cases formed in well defined areas, which were determined by frontal convergence, seabreeze convergence, or local topography. 2) The echoes were composed of a number of sub-cells, which grew and decayed in a cycle similar to that described by Byers and Braham (1949). The larger echoes, termed storm complexes, had life periods of the order of several hours and seemed to pulsate as the sub-cells grew and decayed. It is implied that the sub-cells are compoded of even smaller cells or currents that have much shorter life periods. 3) The storms of this study reached their maximum intensity during the mid-afternoon while the surface heating was at a maximum. 4) In all the cases where storms moved eastward to the coast, they lost intensity and dissipated as the coastal region was reached. 5) The storm motion was determined by the mean wind flow through the level through which the storm extended. The SCR 615-B (10.7 cm) radar is considered an effective tool for studying the structure of thunderstorms; however, its poor resolution averages out a large amount of detail. (Author)

Descriptors :   (*THUNDERSTORMS, AIR MASS ANALYSIS), METEOROLOGICAL RADAR, STORMS, RADAR CROSS SECTIONS, WIND, ATMOSPHERIC MOTION, RADAR REFLECTIONS, METEOROLOGICAL CHARTS, PHOTOGRAPHS, PLAN POSITION INDICATORS

Distribution Statement : APPROVED FOR PUBLIC RELEASE