Ianos developed from an area of low pressure over the Gulf of Sidra that quickly began tropical cyclogenesis while moving over warm waters.

After receiving various names from different meteorological centers, the storm, dubbed Ianos by the METEO unit of the National Observatory of Athens,[2] rapidly intensified while moving northeastward.

On that day, a low-pressure area began to develop over the Gulf of Sidra, beginning tropical cyclogenesis by forming a warm core at the surface.

[6] The cyclone quickly developed in the subsequent hours while slowly moving northwest, with a wind speed of around 50 km/h (31 mph).

[7] By 15 September, it had intensified to 65 km/h (40 mph), with a minimum pressure of 1,010 hPa (30 inHg), with further development predicted over the coming days.

The cyclone had strong potential to become tropical over the next several days due to warm sea temperatures of 27 to 28 °C (81 to 82 °F) in the region.

[3][7][8] After making landfall, Ianos turned south-southeastward on 19 September, moving back out to sea,[9] where the storm managed to reorganize somewhat.

[13] As Ianos passed to the south of Italy on 16 September, it produced heavy rain across the southern part of the country and in Sicily.

On 19 September, a man was found dead on his farm north of Athens, while the body of a woman was recovered from her flooded home in a nearby town.

[4] In addition, there were strong tides in Ionian islands such as Kefalonia, Zakynthos, Ithaca and Lefkada, and 120 km/h (75 mph) winds at Karditsa that brought down trees and power lines, and caused landslides.

The top officials of the corporation met with the leader of the Karditsa Fire Department to coordinate and accelerate water pumping in areas where the technical crews needed to work.