The fringe of the storm could affect the island on Friday afternoon if it stays on its current course, and make landfall over southeastern Taiwan by Saturday morning, added the bureau.
On Wednesday, the tropical cyclone intensified into a category 5 super typhoon to bring the Philippine capital, Manila, to a near standstill.
Monsoon rains induced by Sepat - a fresh water fish in Malay - flooded many parts of the city, causing monstrous traffic jams and forcing the authorities to suspend classes and close government offices.
More than 220 people were evacuated from flooded homes mostly in Manila's flood-prone suburbs of Marikina, Malabon and San Juan, according to the Philippine National Disaster Co-ordination Council.