Abstract
Abstract The kinematic structure and reflectivity distribution within a region of widespread precipitation associated with a summertime midlatitude (Illinois) squall line, as revealed by an analysis of Doppler radar data, are presented and discussed. The squall line moved in a southeasterly direction while active convection forming on its leading edge moved in a northeasterly direction. Decaying thunderstorms and their anvils merged to form the extensive region of stratiform precipitation which trailed the squall line. An extension of the VAD (Velocity Azimuth Display) method, or the EVAD (Extended VAD) method, has been developed for the analysis of single-Doppler radar data. In contrast to the VAD method, which requires knowledge of the particle fall velocities (or assumptions regarding it) to calculate the divergence of the horizontal wind, the EVAD method yields the vertical distributions of both the particle fall speed and the divergence. Also presented are results from a multiple-Doppler (MDOP) analy...
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