Thessaloniki, in northern Greece, receives around 450 mm (about 18 inches) of rain a year, slightly more than Athens, with a similar autumn-and-winter concentration and dry summer typical of the Mediterranean climate. The city sits at the head of the Thermaic Gulf, and intense autumn storms moving in from the Balkans or the Aegean can bring heavy short-term rainfall capable of flooding low-lying coastal streets. Because Thessaloniki, like the rest of Greece, sees such a pronounced dry-to-wet seasonal shift, the transition period in early autumn tends to carry disproportionate flood risk compared with later, more established wet-season storms. Greece’s National Meteorological Service operates the national radar network.
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