Vol. 33, issue 02, article # 11

Abstract:

Characteristics of the thunderstorm with a waterspout over Ladoga Lake obtained with the help of C-band radar, lightning detection system, and radiosonde data are studied. The analysis of instability indices shows low and moderate probability of developing intensive convective processes. The hydrometeor classification and the updraft identification algorithms are used for the first time for the DMRL-C radar and are based on processing of polarization measurements. These algorithms made it possible to detect the appearance of big ice particles when lightning began and to extended updraft associated with the waterspout. The correlation analysis of the frequency of lightning and cloud characteristics, obtained by radar, was carried out. It showed the closest correlation of the frequency  with the number of big ice particles, characterized by supercooled part of the cloud (above the 0 °C level)  with the reflectivity higher than 50 dBZ.

Keywords:

waterspout, polarimetric radar, hydrometeor classification algorithm, updraft, instability indices, lightning frequency

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