<abstract xmlns="http://www.w3.org/1999/xhtml"><p>In the last two decades we can notice a significant increase of severe anemological events, which are mostly connected with mesoscale convective systems and a cold front of a deep low-pressure system. One of them are very strong winds with speeds more than 25 m/s. They caused material damage and threatening people's lives. The most dangerous are winds generated by mesoscale convective systems where radar reflectivity signatures of bow echo/derecho appeared. In this paper the area of occurrence of such phenomenon in Poland are described and the features of bow echo signatures on radar images are presented and explained. Additionally one of the most severe event and still very weakly known episode of 11<sup>th</sup> August 2017 derecho in Poland is analysed. The damage data from European Severe Weather Database (ESWD) were analysed to confirm if the August 11th storm met derecho criteria. To identify the radar reflectivity signatures inside MCC the data from the Polish Institute of Meteorology and Water Management shared on the radar-opadow.pl site were used. The CAPPI 1 km data were very useful to determine the convective forms. After that the data from synoptic station were examined for presenting the running of selected meteorological elements. Finally, some information about material damage in infrastructures and forests are mentioned.</p></abstract>

In the last two decades we can notice a significant increase of severe anemological events, which are mostly connected with mesoscale convective systems and a cold front of a deep low-pressure system. One of them are very strong winds with speeds more than 25 m/s. They caused material damage and threatening people's lives. The most dangerous are winds generated by mesoscale convective systems where radar reflectivity signatures of bow echo/derecho appeared. In this paper the area of occurrence of such phenomenon in Poland are described and the features of bow echo signatures on radar images are presented and explained. Additionally one of the most severe event and still very weakly known episode of 11th August 2017 derecho in Poland is analysed. The damage data from European Severe Weather Database (ESWD) were analysed to confirm if the August 11th storm met derecho criteria. To identify the radar reflectivity signatures inside MCC the data from the Polish Institute of Meteorology and Water Management shared on the radar-opadow.pl site were used. The CAPPI 1 km data were very useful to determine the convective forms. After that the data from synoptic station were examined for presenting the running of selected meteorological elements. Finally, some information about material damage in infrastructures and forests are mentioned.

The Mesoscale Convective Systems with <italic>bow echo</italic> radar signatures as an example of extremely severe and widespread geohazard in Poland

Department of Climatology, Faculty of Earth Sciences

Environmental & Socio-economic Studies

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The Mesoscale Convective Systems with  radar signatures as an example of extremely severe and widespread geohazard in Poland

In the last two decades we can notice a significant increase of severe anemological events, which are mostly connected with mesoscale convective systems and a...

The Mesoscale Convective Systems with bow echo radar signatures as an example of extremely severe and widespread geohazard in Poland

Published Online: Mar 23, 2018

Page range: 10 - 16

Received: Dec 05, 2017

Accepted: Feb 26, 2018

DOI: https://doi.org/10.2478/environ-2018-0002

Keywords
derecho, wind gusts, Mesoscale Convective Complex, Poland, radar signature analysis, satellite analysis

© 2018 Artur Widawski et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The Mesoscale Convective Systems with bow echo radar signatures as an example of extremely severe and widespread geohazard in Poland

Published Online: Mar 23, 2018

Page range: 10 - 16

Received: Dec 05, 2017

Accepted: Feb 26, 2018

DOI: https://doi.org/10.2478/environ-2018-0002

Keywordsderecho, wind gusts, Mesoscale Convective Complex, Poland, radar signature analysis, satellite analysis

© 2018 Artur Widawski et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
derecho, wind gusts, Mesoscale Convective Complex, Poland, radar signature analysis, satellite analysis