Helen has slowly intensified into a typhoon, the state weather bureau Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa) said on Sunday.
According to the weather bureau, Typhoon Helen was last located 880 km east of Calayan, Cagayan, and is moving west-northwest at 22 kilometers per hour (kph).
It packs maximum sustained winds of up to 140 kph near the center and gusts of winds of up to 175 kph.
Pagasa raised signal No. 1 over Batanes Group of Islands and the Babuyan Group of Islands in Northern Luzon.
The typhoon is expected to leave the country on Tuesday afternoon and will make landfall in southern Taiwan.
Cloudy skies with light to moderate rains and thunderstorms will prevail over Visayas, Caraga Region, Northern Mindanao, Zamboanga Peninsula and the rest of Luzon.
Partly cloudy to cloudy skies with isolated rainshowers or thunderstorms are expected over the rest of Mindanao.