On 17 September 2004, between 19:00 and 20:00 UTC, an episode of intense rain left 17 mm of water in Thessaloniki which caused flooding and the release of sewage waters (and rats) over the Bay of Thermaikos.
21 October 2020
17 September 2013
The system was driven by a low at 500 HPa centred at midday over Sardinia, with outflow over Greece.
by Paschalis Katsaras and Nikos Vogiatzis (Hellenic National Meteorological Service ), José Prieto (EUMETSAT)
The IR imagery animation shows the cloud tops, not reaching high in the troposphere, however, fed by intensive vertical instability. Highest cloud tops over Greece stayed above 220 kelvin (or -53 °C).
Sicily suffered intense rain at the same time, due to the same synoptic system. It can be concluded that the persistence of rain on the same spot around the town was at the origin of the local disturbance.
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