Storm Byron triggers floods and major disruptions
The severe weather system “Byron” continues to sweep across Greece with unabated intensity, causing significant disruptions and flooding across multiple regions, including Attica. Several roads in the wider Athens area were inundated, while the Athens–Corinth National Road was closed in the direction of Corinth. Traffic has been diverted from the Elefsina toll station toward the Nea Peramos exit, authorities confirmed.
According to the Emergency Bulletin of Hazardous Weather Phenomena issued by the National Meteorological Service, the heavy rainfall and thunderstorms affecting most of the eastern and southern parts of the country are expected to persist until early Saturday (December 6, 2025). Today, the storm’s impact will remain particularly severe and potentially dangerous in the regional units of Pieria, Imathia, Pella, Chalkidiki, Thessaloniki and Kilkis, as well as in Thessaly, the Sporades, Attica until the morning, Evia until midday, the Cyclades and Crete until noon, and the Eastern Aegean islands and the Dodecanese.
Attica has been among the hardest-hit regions, with authorities reporting extensive problems across several areas. Heavy rainfall that began yesterday afternoon and continued through the night led to flooding in Mandra, Nea Peramos and Megara. Significant disruptions were also reported on the Attica road network, with numerous vehicles left immobilized by rising waters.
The Fire Service reported that its Operations Center received 331 calls between yesterday and 6 a.m. today, primarily for water pumping, tree removal and assistance cases across Attica and the Peloponnese.
The Scientific Risk Assessment Committee is scheduled to reconvene at 12:00 to review updated data and reassess the evolving situation.
