The low pressure area spotted near Quezon province has turned into a typhoon which the weather bureau named Isang.
The Philippine Atmospheric, Geophysical, and Astronomical Services Administration (Pagasa) placed 13 provinces in Northern Luzon under Storm Signal No. 1.
Isang is packing maximum sustained winds of 55 kilometers per hour near its center. Signal No. 1 has been hoisted over Abra, Ilocos Norte, Ilocos Sur, Ifugao, Cagayan, Calayan Island, Babuyan Group of Islands, Isabela, Quirino, Aurora, Mountain Province, Kalinga and Apayao.
Pagasa said Isang is expected to make landfall in Casiguran, Aurora this evening if it will maintain its path.
Chris Perez, Pagasa forecaster, said the ninth tropical cyclone to enter the country has a small chance of intensifying. The storm will strengthen Southwest monsoon which will make seas near the regions of Ilocos and Cagayan Valley moderate to rough.
All sea vessels in areas under storm signal No. 1 were barred by the Philippine Coast Guard from leaving port on Tuesday.
Fishermen at sea in northern Luzon were ordered to return home.
Commander Armand Balilo, spokesman of the Coast Guard, said the travel ban will be lifted once the storm has passed.
The western section of Luzon including Metro Manila, Central Luzon, Calabarzon, Mimaropa as well as Visayas will have light to moderate rains.
Mindanao will be partly cloudy to cloudy with isolated rainshowers or thunderstorms.