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On the afternoonof30th August 2022, a powerful supercell thunderstorm in northeastern Catalonia, Spain, produced a giant hail episode. This rare event resulted in one fatality, over 70 injuries and substantial property damage. According to the records of the severe weather of the Meteorological Service of Catalonia (SMC), this is the largest hailstone ever recorded by Meteorological Network Spotted (XOM).The focus of the study is to understand why hailstones of exceptional size, reaching 10 cm in diameter, were produced by this storm. For this purpose, firstly we consulted the observations recorded by the local people to identify the path of the hailstorm and the different affectations along the way. Next, we combined the remote sensing datato reveal the severe weather signatures. The radar fields revealed largereflectivity strongvertical development, and very largeforward anvil, which measured over 40 km in length. Complementary to this, the total lightning flash ratesteeplyincreased at the same time asan intensification of severe weather radar signatures (tilting, three-body scatter spike, BWER-Bounded weak echo region). The satellite imagery allowedthe cold ring pattern detectionand extreme cold overshootingtop-downto -64 C.On the other hand, the synoptic, mesoscale, radiosonde, andcross-sectionsrun by WRF 3 km and 1.5 kmwereevaluated to characterize the thermodynamic and environmental conditionsfavourablefor the growth of a supercell withlarge-hailpotential. The values of CAPE in the coastal line were > 2.500 J/kg, the Total Precipitable Water was > 4 cm, andthe hodograph signature revealed a strong low-level inflow and strong upper outflow.
Temprano et al. (Fri,) studied this question.
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