It is the first time on record that more than three tropical storms have occurred at the same time in November in the region.

Storm Toraji is expected to weaken in Vietnam's East Sea as two new storms, Usagi and Manyi, gather strength in the Northwest Pacific, posing threats to the Philippines.

Devastating floods struck the northern Philippines on Monday, when Tropical Storm Toraji became the fourth tropical storm to hit the island nation in three weeks.

The Philippines prepared Tuesday to evacuate potentially tens of thousands of people as the fifth major storm in three weeks bore down on the archipelago shortly after the onslaught of Typhoon Toraji.