Accession Number : AD0263827

Title :   RESEARCH IN TROPICAL METEOROLOGY. SOME MESOSCALE METEOROLOGICAL PHENOMENA OF THE CARIBBEAN AREA

Descriptive Note : Final rept., pt. 2, 1 Jul 60-30 Jun 61.

Corporate Author : TEXAS UNIV AUSTIN ELECTRICAL ENGINEERING RESEARCH LAB

Personal Author(s) : PORTIG,WILFRIED H. ; KOWALIK,VIRGIL C.

Report Date : 30 JUN 1961

Pagination or Media Count : 1

Abstract : An anticyclonic outdraft over the northern Gulf of Mexico is described which is obviously the consequence of outflowing cold air produced by thunderstorms. The data fit well to the model developed for land areas and predicted for tropical oceans. The effect of strong wind shear on tropical cumulonimbi is discussed. Contrasting to the experience in higher latitudes, a wind shear is not a prerequisite of hail formation but that a strong shear diminishes rather than enhances the precipitation. A case is described in which parts of a plume display moist unstable ascent to very great altitudes which are numerically determined by the known heights of wind shears. The upper air conditions immediately preceding the formation of tropical storm ARLENE are presented. Thermodynamical instability in the higher troposphere together with relatively high stability in lower layers was found near the location where the storm formed. The unusual moisture content of the entire (as far as revealed by measurements) troposphere probably provided the energy which was released by the instability aloft. Computation of the sum of momentum from the ground upward seems to prove that the mixing layer (friction layer) is much higher than assumed (about 10,000 feet). The mean wind conditions during the period 2730 June 1959 are shown at eight levels. (Author)

Descriptors :   *METEOROLOGY, *TROPICAL REGIONS, AIR MASS ANALYSIS, CLIMATE, CLOUDS, METEOROLOGICAL CHARTS, STORMS, WEATHER FORECASTING, WIND

Distribution Statement : APPROVED FOR PUBLIC RELEASE