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On 13 May, a low-pressure area formed over the Adriatic Sea, as polar air from Central Europe penetrated into the Mediterranean basin. The cold polar air mass met with humid subtropical air, leading to very low pressure. On 14 May, the low moved over the Balkans, becoming stationary. As a result, extremely heavy rain fell within the region; Serbia (in the area around Belgrade) and Bosnia were most affected.[16] Serbian and Bosnian meteorologists named the formed cyclone "Tamara".[17][18] On 15 May, the daily amounts of rainfall broke historical records in Belgrade (107.9 mm), Valjevo (108.2 mm) and Loznica (110 mm).[19] By 15 May, the monthly rainfall in Belgrade had broken the historical record (175 l from 1897), reaching 205 l.[20] By Saturday, May 17, the rain had subsided, and the weather gradually became warmer and sunnier, somewhat easing relief and rescue efforts. On 18 May, the cyclone moved further northwest.
The city of Obrenovac was hit hardest by the floods, with an estimated 90% of the town flooded.[23] During the night between 15 and 16 May, nearby Kolubara river, collecting waters from southerly mountains, suddenly rose several meters above its banks and flooded the city, catching the residents by surprise. The entire city was evacuated.[24][25] During 18 May, the water level dropped, which enabled the evacuation of the citizens of Obrenovac to be carried out by trucks instead of boats.[26] As of 20 May the total number of evacuated persons exceeded 30,000.

Source:
http://en.wikipedia.org/wiki/2014_Southeast_Europe_floods

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