East China provinces are on high alert for two approaching typhoons that may bring gales and rainstorms to an already flooded coastal part of China.

The National Meteorological Center (NMC) predicted that among the three typhoons Chan-hom, Linfa and Nangka that had formed on the northwest Pacific, Chan-hom and Linfa will affect China in the coming days.

The flood control and drought relief headquarters of Zhejiang Province in east China on Monday initiated a level-four emergency response to flood, saying the coming typhoons may worsen its flood situation.

The headquarters said the province has seen persistent rain since June 7, which has caused serious flood and geological disasters in its mountain areas.

The southeastern province of Fujian has also warned of strong wind and huge wave in the coming three days as a result of the two nearing typhoons.

The NMC said the center of Linfa, the 10th typhoon this year, was located 335 kilometers southwest of Taiwan's Eluanbi at 5 p.m., Monday, and is moving toward the island at 10 kilometers per hour.

It downgraded to tropical storm level on Monday afternoon, packing winds of 23 meters per second near its center.

Chan-hom, the ninth typhoon this year, is located about 1,950 kilometers southeast of the Diaoyu Islands at 5 p.m., the NMC said. It is strengthening while barrelling northwest toward the Chinese mainland and is expected to lash country's eastern coast on Friday.