Abstract
May 9, 2003 thunderstorm in southwest Slovakia is considered one of the most severe convective events to have happened in Slovakia during the past ten years. The majority of the reported damage was caused by very strong outflowing winds and hail. The downburst (macroburst) nature of the event was confirmed by a damage survey carried out in the area hit by the thunderstorm. The supercell nature of the storm was inferred from radar measurements, with the fields of radar reflectivity and radial Doppler velocity showing typical supercell features (e.g. BWER echo). The satellite imagery (from METEOSAT 7) indicated a large-scale dry air intrusion as a possible factor of downdraft enhancement. Aspects of the storm environment were inferred from soundings, numerical analysis of the ALADIN model and Velocity Azimuth Display data from radar. The results enable comparison of the outputs of several instability indices, such as CAPE, DCAPE and Storm to Relative Environmental Helicity (SREH). It was concluded based on structure and development that the storm showed many similarities to the so called High Precipitation (HP) supercell type.
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