Detection of hail through the three-body scattering signatures and its effects on radar algorithms observed in Romania

Carbunaru, Daniel; Sasu, Monica; Burcea, Sorin; Bell, Aurora

doi:10.1016/s0187-6236(14)71098-7

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…15b). This conclusion is based on the relationship between the Doppler radial velocities in the TBSS area, the storm core, the vertical velocities associated with hydrometeors (Zrnić, 1987;Carbunaru et al, 2010), and the presence of high positive Doppler velocity in the beginning of TBSS.…”

Section: Montana Supercellmentioning

confidence: 99%

Severe convective supercell outbreak over western Bulgaria on July 8, 2014

Bocheva¹,

Dimitrova²,

Penchev³

et al. 2018

Időjárás

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Abstract⎯ Bulgaria is situated in a geographical area with high frequency and intensity of thunderstorms and hail events. Like in many other countries, an upward trend of weatherinduced damage has been observed during the last 15 years in Bulgaria. Much of it was caused by extreme weather events such as torrential precipitation associated with severe thunderstorms or/and wind storms. The series of flash floods and extreme hail storms, which hit Bulgaria in the warm half of 2014, were in line with that trend.On July 8, 2014, three supercell storms developed over West Bulgaria and heavily impacted urban areas in the afternoon. The extremely strong hail storms over Sofia and Montana were accompanied by strong wind gusts (about 85 km h -1 ) and torrential rain. The giant hail stones in Sofia had diameter of up to 10 cm and irregular shape. The severe hail and rain, and very strong wind caused substantial damage to infrastructure, buildings, vehicles, and agriculture. More than 40 people were injured by hail stones or collaterally by broken windows. One man was killed by a fallen tree. In Sofia alone, the reported damage was worth more than 100 million euro according to data from insurance companies.The paper presents the analysis of the evolution of the convective clouds based on radar data. The Doppler radar data revealed the existence of a mesocyclone, mesoanticyclone, microburst, and three-body scatter signature. The cloud top reached up to 17 km, and the maximum radar reflectivity factor was 69-71 dBZ. Analysis of the available radiosounding data, simulation with a numerical model, and the synoptic patterns are also presented.

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Section: Montana Supercellmentioning

confidence: 99%

Severe convective supercell outbreak over western Bulgaria on July 8, 2014

Bocheva¹,

Dimitrova²,

Penchev³

et al. 2018

Időjárás

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“…In Romania, there are only a few studies that have investigated convective events, and such studies examined severe convective storms and tornadoes [23][24][25]. Manea et al [17] have found statistically significant increasing trends in the frequency of days with rain showers and snow showers over most of Eastern Romania, with no statistically significant trends in the frequency of sleet showers.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Variability of Convective Events in Romania Based on METAR Data

Piticar,

Andrei,

Tudor

2024

Sustainability

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Convective weather, through its heavy showers, strong winds and hail, significantly impacts human activities, having the potential to inflict serious damage on social and environmental sectors. Limited research has been conducted on this phenomenon within Romanian territory, and currently there is no referenced climatological study primarily aimed at air traffic management users in this context. This study aims to assess the climatological aspects related to convective events based on sub-hourly observation data recorded at 17 airport weather stations throughout Romania during an 11-year period (2012–2022). The spatiotemporal distribution of convective events was analyzed based on occurrences of Cumulus Congestus (TCU) clouds, Cumulonimbus (CB) clouds, thunderstorms (TSs), heavy showers (+SHs), and hail (GR). With the data being extracted from meteorological aerodrome reports (METARs) and special meteorological aerodrome reports (SPECIs). Short-term trends were determined using Sen’s slope estimator, and statistical significance was assessed through the Mann–Kendall test. The main findings indicated that the highest occurrence of convective events is located over central and western Romania, with June emerging as the extreme month in terms of convective events, while the hourly distribution emphasizes that the highest frequency of convective events occurred in the afternoon. Trend analysis in TCU, CB, and TS show tendencies toward higher frequency of convective events while the results related to +SH and GR indicate a high variability across Romanian territory. Trend analysis disclosed more substantial changes in the TS variable. The results of this study bear potential significance for a broad spectrum of human activities and the management of natural environments.

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“…Radar reflectivity can be used to assess and monitor the intensity of precipitation and to infer the precipitation type. The occurrence of hail on the ground that causes severe damage is very likely when the radar reflectivity exceeds a threshold of 55 dBZ (Sandu et al 2010;Schiesser 1990;Schuster et al 2006;Carbunaru et al 2014;Junghänel et al 2016). However, vegetation damage can be estimated based on multispectral images.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Hail Damage on Agricultural Crops from North of Baragan Plain, Romania, Using Remote Sensing Data

Angearu¹,

Onțel²,

Irimescu³

et al. 2021

Preprint

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Hail is one of the dangerous meteorological phenomena facing society. The present study aims to analyze the hail event from 20 July 2020, which affected the villages of Urleasca, Traian, Silistraru and Căldăruşa from the Traian commune, Baragan Plain. The analysis was performed on agricultural lands, using satellite images in the optical domain: Sentinel-2A, Landsat-8, Terra MODIS, as well as the satellite product in the radar domain: Soil Water Index (SWI), and weather radar data. Based on Sentinel-2A images, a threshold of 0.05 of the Normalized Difference Vegetation Index (NDVI) difference was established between the two moments of time analyzed (14 and 21 July), thus it was found that about 4000 ha were affected. The results show that the intensity of the hail damage was directly proportional to the Land Surface Temperature (LST) difference values in Landsat-8, from 15 and 31 July. Thus, the LST difference values higher than 12° C were in the areas where NDVI suffered a decrease of 0.4-0.5. The overlap of the hail mask extracted from NDVI with the SWI difference situation at a depth of 2 cm from 14 and 21 July confirms that the phenomenon recorded especially in the west of the analyzed area, highlighted by the large values (greater than 55 dBZ) of weather radar reflectivity as well, indicating medium–large hail size. This research also reveals that satellite data is useful for cross validation of surface-based weather reports and weather radar derived products.

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Detection of hail through the three-body scattering signatures and its effects on radar algorithms observed in Romania

Cited by 6 publications

References 6 publications

Severe convective supercell outbreak over western Bulgaria on July 8, 2014

Severe convective supercell outbreak over western Bulgaria on July 8, 2014

Spatiotemporal Variability of Convective Events in Romania Based on METAR Data

Assessment of the Hail Damage on Agricultural Crops from North of Baragan Plain, Romania, Using Remote Sensing Data

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