MANILA - Severe tropical storm Onyok has intensified into a typhoon as it continues to move over the Philippine Sea, the state weather bureau said Sunday night.

Tropical cyclone wind signal no. 1 was still hoisted over Batanes and Babuyan Islands.

As of 10 p.m., Onyok was last spotted 510 kilometers north of Basco, Batanes, moving northwest at 25 kilometers per hour (kph) and packing maximum winds of 120 kph and gusts of up to 150 kph.

It will bring scattered light to moderate rains and isolated thunderstorms over Cagayan Valley region, PAGASA said.

Onyok is less likely to make landfall in the country. It is expected to exit the Philippine area of responsibility Monday night.

PAGASA said sea travel is risky, especially for small seacraft, over seaboards under the wind signal due to potentially rough sea conditions.

Visit the ABS-CBN Weather Center for updates.