Radar detection of hail in Czechia using single- and/or dual-polarization data

0510872 - ÚFA 2020 DE eng A - Abstrakt
Skripniková, Kateřina - Řezáčová, Daniela
Radar detection of hail in Czechia using single- and/or dual-polarization data.
10th European Conference on Severe Storms (ECSS 2019). Münchene: European Severe Storms Laboratory e.V. (ESSL), 2019.
[European Conference on Severe Storms (ECSS) /10./. 04.11.2019-08.11.2019, Kraków]
Institucionální podpora: RVO:68378289
Klíčová slova: heavy precipitation * hail * hail detection * hailstone size classification * radar
Obor OECD: Meteorology and atmospheric sciences
https://meetingorganizer.copernicus.org/ECSS2019/ECSS2019-68.pdf

Comparative analysis of radar-based hail detection and hailstone size classification is presented. It uses C-band
polarimetric radar data from Czech territory for 5 stormy days in May and June 2016. Altogether 27 hail events
were selected from hail reports of the European Severe Weather Database (ESWD). Also 21 heavy rain events
without hail were found in ESWD during the studied stormy days for comparison. Hail detection methods were
applied to the both sets of events.
The hail detection results compared in this work were obtained by using a criterion, which is based on
single-polarization radar data, and by the technique, which uses dual-polarization radar data. The both methods
successfully detect large hail events in a similar way and show a strong agreement. The hail detection, as applied
to heavy rain events, indicate a weak enhancement of the number of false detected hail pixels in the use of
hydrometeor classification on the basis of the dual-polarization data. We also examined the performance of hail
size estimation from radar data using both single- and dual-polarization methods. Hail size reports on the ground
are related to the radar signatures. Both approaches recognize events with large hail but cannot select the events,
which report maximum hail size (diameter above 4 cm).
Finally the potential hail detection improvement using dual-polarization radar data is discussed.
Trvalý link: http://hdl.handle.net/11104/0301242