Taipei, Aug. 5 (CNA) A sea warning for Typhoon Dolphin could be issued as early as Friday afternoon as the storm moves closer to Taiwan, the Central Weather Administration (CWA) said Wednesday. As of 8 a.m. Wednesday, the center of the typhoon was located about 1,680 kilometers east of Taipei and moving west at 20 kph, the CWA said. Meanwhile, Tropical Storm Kujia formed west of Luzon at 2 a.m. Wednesday and is forecast to move east of the island before weakening and being absorbed by Typhoon Dolphin, according to the agency. Northern Taiwan is expected to see brief showers Friday, while central and southern Taiwan could experience scattered rain. The heaviest rainfall is forecast for Saturday and Sunday, with torrential rain possible in mountainous areas of northern Taiwan and heavy rain forecast across northern and central Taiwan and Matsu.