Analysis of Tornadic Storm in Southern Moravia on 24th June 2021 Based on Polarimetric Doppler Weather Radar and Lightning Detection Data

On 24^th June 2021 a devastating F4 tornado occurred in southern Moravia (SE of Czechia) that directly caused 6 fatalities and about 200 injuries. Approximately 200 houses and buildings out of about 1200 damaged ones had to be torn down. It has been the most severe tornado in modern history of Czechia.

Besides other data sources, the event was captured by C-band polarimetric Doppler radars of the Czech Weather Radar Network (CZRAD) as well by the LINET lightning detection network. Contribution will present analysis of these data and discuss their utilization in operational severe storm nowcasting in the Czech Hydrometeorological Institute. Operational nowcasting algorithm CELLTRACK for convective storm nowcasting and web-based application JSMeteoView2 for radar and lightning data analysis and display will be introduced.

The pronounced Doppler radar signatures of supercell storms like the hook echo, bounded weak echo region and the mesocyclone signature will be shown together with signatures derived from the polarimetric radar moments such as RHO_HV ring, ZDR arc/ring or K_DP column.

Contribution will also present comparison of various radar and lightning characteristics of tornadic storm with characteristics of all other storms identified over Czech Weather Radar Network domain by the CELLTRACK nowcasting algorithm during the investigated period of 24^th June 2021.