Powerful winds sweeping across the Aegean Sea triggered coastal flooding along the Katerini seafront in northern Greece on Sunday, prompting local authorities to request that the area be declared a state of civil protection emergency.
The Municipality of Katerini submitted a formal request to Greece's General Secretariat for Civil Protection following intense wave activity and a marine overflow phenomenon that inundated large stretches of the coastline. The affected areas include the communities of Paralia, Olympic Beach, and Korinos, all popular seaside summer destinations.
According to the municipal authority, strong southerly winds that intensified around midday caused extensive flooding along the coast. Municipal technical services and urban planning staff have begun recording damage to public infrastructure, including sections of the road network, technical works and pumping stations. Detailed technical reports, accompanied by photographic documentation, are now being compiled to assess the scale of destruction and support the emergency declaration request.
The situation, described by local officials as a "marine uprising", is a meteorological and oceanographic process known as wind setup. When persistent winds blow across open water, they transfer momentum to the sea surface, driving currents towards the coast.
In the Thermaic Gulf, southerly or south-easterly winds travel across a long fetch, hundreds of kilometres over open sea, allowing water masses to accumulate and temporarily raise sea levels by 10 to 30 centimetres or more. As these energy-laden waves break in shallow waters, they push additional water shoreward, creating a temporary build-up that further elevates local sea levels.
The effect can become particularly pronounced in semi-enclosed basins such as the Thermaic Gulf, which borders Thessaloniki and Pieria. Northern Greece's coastal infrastructure is vulnerable to extreme weather events, as shifting wind patterns and rising sea levels increase the frequency and intensity of such episodes.
