Accession Number : ADA300051

Title :   The Initiation and Development of a Long-Lived, High Plains Squall Line.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Grady, Rodney L.

PDF Url : ADA300051

Report Date : 10 SEP 1995

Pagination or Media Count : 121

Abstract : A non-severe squall line that developed on 21 June 1993 along the northern foothills of the Colorado Rocky Mountains is analyzed using a series of triple-Doppler analyses and compared to the conceptual model for a typical squall line with trailing stratiform rain area. One group of numerical modelers has successfully modeled many of the features identified within the conceptual model. Based on the simulations, they hypothesize that the observed features can be explained through a balance between the circulations induced by the low-level ambient vertical shear of the horizontal wind ahead of the line and that induced by the horizontal buoyancy gradient along the leading edge of the convectively generated cold pool. These circulations dictate the orientation of the updraft which is key to understanding the structure and longevity of squall lines. Although this balance may be significant in some cases, observations in this case suggest that in differing environments, the hypothesis may need to be expanded. (MM)

Descriptors :   *DOPPLER RADAR, *RAIN, *METEOROLOGICAL PHENOMENA, *ATMOSPHERIC PRECIPITATION, *CONVECTION(ATMOSPHERIC), SHEAR PROPERTIES, MATHEMATICAL MODELS, THERMODYNAMICS, WIND, ATMOSPHERIC MOTION, TOPOGRAPHY, METEOROLOGICAL SATELLITES, STORMS, LEADING EDGES, ROCKY MOUNTAINS, REFLECTIVITY, CIRCULATION, COLORADO, BUOYANCY.

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE