Accession Number : AD0671940

Title :   CONVECTIVE OVERTURNING AND SUMMER STORMS,

Corporate Author : MCGILL UNIV MONTREAL (QUEBEC) STORMY WEATHER GROUP

Personal Author(s) : Marshall,J. Stewart

Report Date : JAN 1968

Pagination or Media Count : 31

Abstract : The outer shell of a cumulus cloud should be quite stable, and its pattern should be more clear-cut than a cloud of smoke, say, because it is the result of mixing cloud and unsaturated air. Toward the centre of the cloud there should be instability, moderated by mixing, and progressively-increasing liquid water content. The distance that a parcel of cloud can descend in the unstable regime depends on the liquid water content. The possibility is considered that the rate at which the mass of air in a cloud increases approximately equals the rate of entrance through advancing sidewalls and top. This requires that inflow and outflow through the base be equal in mass of air, but that the latter be drier. This model of circulation simplifies the coupling of the cloud to the layer of air from cloud-base to ground. (Author)

Descriptors :   (*STORMS, CONVECTION(ATMOSPHERIC)), CUMULUS CLOUDS, STABILITY, ATMOSPHERIC MOTION, LIQUIDS, ATMOSPHERE MODELS, WATER, AIR MASS ANALYSIS

Subject Categories : Atmospheric Physics
      Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE