ADDS Fiji PM quotes Fiji and Tonga issued severe weather warnings Tuesday as twin cyclones intensified near the Pacific island nations, with Fijian officials preparing evacuation centres amid predictions a category-five super-storm is looming. The Tonga Metservice said Tropical Cyclone Zazu was a category one system, currently packing winds of up to 90 kilometres an hour (56 miles an hour), and expected to reach category two on Wednesday. Meanwhile, forecasters in Fiji said Tropical Cyclone Yasa had reached category three status as it rumbled about 600 kilometres off the coast of the main island Viti Levu, and could top the scale at category five by late Thursday.