BEIJING, Oct. 12 (Xinhua) -- China's marine forecast station on Sunday issued an orange alert as a powerful typhoon generates giant waves.

　　Waves up to nine meters have been seen in the East China Sea under the influence of the typhoon Vongfong and a strong cold front coming from west China, said the station.

　　According to the forecast, waves up to 10 meters high will form in the East China Sea and the Diaoyu Islands will see waves as high as six meters on Sunday night and Monday.

　　Waves will be seen off the coast of Zhejiang, Jiangsu, Fujian, Shanghai, Liaoning, Hebei, Tianjin and Shandong, the center said, warning vessels operating in the waters to take precautions.

　　China has a four-tier color-coded weather warning system, with red representing the most severe warning, followed by orange, yellow and blue.