Derecho-like event in Bulgaria on 20 July 2011

Derecho-like event in Bulgaria on 20 July 2011

In this work we analyze the development of a severe-convective-storm system in northwestern Bulgaria on 20 July 2011 which exhibited derecho-like characteristics. Prior to this event, a derecho had never been documented in Bulgaria. The convective system was associated with a cold front. We present...

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Veröffentlicht in:Atmospheric research 2015-05, Vol.158-159, p.254-273
Hauptverfasser: Gospodinov, Ilian, Dimitrova, Tsvetelina, Bocheva, Lilia, Simeonov, Petio, Dimitrov, Rumen
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Derecho
Radar analyses
Severe convective wind storm
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container_end_page 273
container_issue
container_start_page 254
container_title Atmospheric research
container_volume 158-159
creator Gospodinov, Ilian
Dimitrova, Tsvetelina
Bocheva, Lilia
Simeonov, Petio
Dimitrov, Rumen
description In this work we analyze the development of a severe-convective-storm system in northwestern Bulgaria on 20 July 2011 which exhibited derecho-like characteristics. Prior to this event, a derecho had never been documented in Bulgaria. The convective system was associated with a cold front. We present a synoptic-scale analysis of the evolution of the cold front and an overview of the wind and the damage that has occurred in the region with the strongest impact. The convective system consisted of two multi-cell thunderstorms that are analyzed in some detail, based on radar data. The two storms merged and the convective system evolved into a bow-shape reflectivity structure with two rear inflow notches. The analysis of the radar data revealed cloud top heights of 17km, with the formation of а bounded weak echo region, a maximum radar reflectivity factor of 63dBZ, and wind speeds above 30m/s. The field investigation revealed patterns in the damaged crops typical of strong wind gusts.
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subjects Derecho
Radar analyses
Severe convective wind storm
title Derecho-like event in Bulgaria on 20 July 2011
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