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Nađ, Julijana; Vujović, Dragana; Vučković, Vladan
International journal of climatology, December 2021, 2021-12-00, 20211201, Letnik: 41, Številka: 15Journal Article
Serbia is located in the mid‐latitudes of the Northern Hemisphere and is exposed to frequent hailfall. Consequently, a hail suppression system was gradually developed during the last 54 years. In this study, data from densely distributed hail suppression stations were used to better understand the hail characteristics. Two data subsets are differentiated: the first from the territory of Serbia, excluding the northern province of Vojvodina, during 1981–2015 (P1) and the second from the entire territory of Serbia during 2002–2015 (P2). The distribution of hail size shifted to smaller diameters in P2 compared to P1. The hailfall lasted less than 5 min in about 75% of events while the duration was greater than or equal to 10 min in only 8%. The influence of Serbia's complex orography on hailfall is reflected in the greater average annual number of days with hailfall in mountainous areas, with a maximum mean value of 1.2 in the southwestern part of Serbia, while the maximum number was 2.7. Hail and small hail occurred mainly in the afternoon and evening, with 92.24% of cases being observed from 12:00 to 21:00 local time (UTC + 1). A positive monotonic trend in the annual number of days with hailfall was observed. In both subsets, there was no statistically significant trend in hail frequency. The average seasonal duration of hail and small hail falls showed a decreasing trend in P1. Results showed that the first occurrence of hail falls did not appear earlier in the season. Evaluation of the hail characteristics, climatology, and trends in Serbia based on large set of data covering warm season during 35 years showed no trend in number of hail days nor in hail/small hail frequency. A monotonic increasing trend is detected at 6.7% significance level for the smallest hailstones (smaller than corn size). Larger hailstones had no trend. In the analysed period (1981–2015), the first precipitation of the hail and small hail did not occur earlier in the season. The duration of the hailfalls decreased in the period. We detected the regions most vulnerable to hail, which can help to optimize the operative hail suppression system.
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