Abstract
The comparative analysis of radar-based hail detection methods presented here, uses C-band polarimetric radar data from Czech territory for 5 stormy days in May and June 2016. The 27 hail events were selected from hail reports of the European Severe Weather Database (ESWD) along with 21 heavy rain events. The hail detection results compared in this study were obtained using a criterion, which is based on single-polarization radar data and a technique, which uses dual-polarization radar data. Both techniques successfully detected large hail events in a similar way and showed a strong agreement. The hail detection, as applied to heavy rain events, indicated a weak enhancement of the number of false detected hail pixels via the dual-polarization hydrometeor classification. We also examined the performance of hail size detection from radar data using both single- and dual-polarization methods. Both the methods recognized events with large hail but could not select the reported events with maximum hail size (diameter above 4 cm).
Highlights
Radar measurements using dual-polarization have become common in recent years following the upgrade of radar equipment by national weather services [1,2]
To achieve the main objective of this study, that is, comparing radar-based hail detections via single- and dual-polarization data, we worked with hail events that occurred over the territory of Czechia in 2016
We analyzed hail and heavy rain events from European Severe Weather Database (ESWD) database to compare hail detection performance based on single- and dual-polarization radar data
Summary
Radar measurements using dual-polarization have become common in recent years following the upgrade of radar equipment by national weather services [1,2]. Compared with a single-polarization, polarimetric radar measurements provide more information for retrieving a cloud’s microphysical structure. They are able to identify different microphysical categories [3,4] including hail. The polarimetric hail detection is based on the differences in the radar cross sections for rain and hail particles at horizontal and vertical linear polarization [4]. We focus on comparing hail detection performance when using single- and dual-polarization data during identical hail events. The hail detection ability of the COMBI criterion [5] is compared with the results of Vaisala Hydrometeor Classification (HydroClass) [6]. In addition to hail occurrence detection, hail size detection is compared here by using single-polarization [7] and dual-polarization [8] radar data
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