Accession Number : AD0293815

Title :   A CASE-STUDY OF THUNDERSTORMS ON AN OCCASION OF SMALL WIND SHEAR

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : LUDLAM,F.H.

Report Date : SEP 1962

Pagination or Media Count : 1

Abstract : AN ANALYSIS IS MADE OF EXTENSIVE RADAR AND OTHER OBSERVATIONS OF THUNDERSTORMS WHICH OCCURRED OVER SOUTHERN ENGLAND ON 18 JUNE 1957. THESE TYPICAL HEAT STORMS ARE SHOWN TO BE STRONGLY INFLUENCED BY THE LARGE-SCALE SYNOPTIC SITUATION AND BY TOPOGRAPHICAL EFFECTS. ALTHOUGH THE INSTABILITY WAS LARGE THE INDIVIDUAL STORMS WERE SHORT-LIVED, DID NOT CONTAIN SUSTAINED DRAUGHTS, AND INEFFICIENTLY CONVERTED POTENTIAL INTO KINETIC ENERGY. THE HAIL PRODUCED WAS ONLY SMALL AND SPORADIC. IN ALLTHESE PROPERTIES THE BEHAVIOR WAS IN STRONG CONTRAST TO THAT OF THE SEVERE WOKINGHAM HAILSTORM. THE DIFFERENCE IS ATTRIBUTED TO THE ABSENCE OF WIND SHEAR ON THE PRESENT OCCASION, IN SUPPORT OF THE NEW MODEL PREVIOUSLY ADVANCED FOR SEVERE LOCAL STORMS

Descriptors :   *AIR MASS ANALYSIS, *CUMULONIMBUS CLOUDS, *HAIL, *METEOROLOGICAL RADAR, *WIND, SHEAR STRESSES

Distribution Statement : APPROVED FOR PUBLIC RELEASE