Storm Ballos was a notable extratropical cyclone that caused devastating floods across Greece during mid-October 2021. The second storm to be officially named in conjunction with the naming list of the former, Israel and Cyprus, Ballos formed on 13 October over the Mediterranean Sea from the combination of a frontal system and a circulation which first developed, two days earlier. It then moved over Greece, before proceeding into the Aegean Sea, where it slowly weakened and dissipated by 16 October. However, despite the HNMC naming the system, the Free University of Berlin (FUB) didn’t assign any name on it along with its weather maps. Overall, Ballos caused heavy destruction in Greece, not a week after Storm Athina struck the country. Heavy rainfall caused many disruptions in transportation, along with the storm-spawned flash floods. Over 1,000 calls for help were received by Fire Brigade authorities and traffic bans were implemented to regulate traffic. Ithaca was impacted by 460 millimetres (18 inches) of rainfall, the highest in association with the system. Two more areas received rainfall higher than 260 millimetres (10 inches). In addition, Ballos also brought the first snow to the country, with Western Macedonia, with 15 centimetres (5.9 inches) falling there. Two deaths were reported in the country, all due to them being swept away by strong currents of floods.
Meteorological history
Ballos originated from a circulation which developed on 11 October over Corsica. On the next day, an extratropical cyclone formed in the Black Sea, with a barometric pressure of 1,005 mbar (1,005 hPa). At that day, the circulation over the aforementioned island entered the Tyrrhenian Sea near southern Italy, in which it attained a pressure of 1,010 mbar (1,010 hPa). The storm over the Black Sea eventually moved northwards by 13 October, with the strengthening circulation over Italy merging over the system’s front. At the same day, the Hellenic National Meteorological Service named the strengthening storm “Ballos”, the second from the agency’s collaborated naming lists. It further coalesced into a single system near Greece on 14 October, with the storm connected to a strong high pressure area, in which the Free University of Berlin (FUB) named “Oldenburgia” before it moved northeastwards across the country on the next day and emerging into the Aegean Sea. It then continued its northeastward movement before dissipating on weather maps by 16 October.
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