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Severe thunderstorm developed over north-western Bulgaria starting from around the town of Byala Slatina in north-western Bulgaria moving eastwards and hitting Pleven, one of the biggest cities in northern Bulgaria in the afternoon hours on 15 May 2018. The storm quickly developed into a powerful long-lived supercell causing all possible types of convective hazards: strong winds, large hail, heavy rain and accompanying flash flooding. It caused a lot of damage on properties, cars and infrastructure. It Strong winds uprooted trees on its way and caused power outages. In the municipalities of Byala Slatina and Pleven has been declared a state of emergency.
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