Thousands of residents in the south-western Polish town of Nysa rallied on Tuesday to successfully prevent the breaching of a crucial dyke, as severe flooding across Central and Eastern Europe continues to keep emergency forces on edge and the death toll nears 20. “Nysa has been saved from the worst,” the head of the regional administration, Monika Jurek, was quoted as saying by Poland’s PAP news agency. Located about 90 kilometres south of Wrocław, Nysa was at risk as water levels in the Nysa Kłodzka river continued to rise amid the persistent rainfall that battered the region since the weeke…