MANILA, Philippines --- Packing maximum sustained winds of 205 kph and gustiness of up to 240 kph, typhoon "Lawin" (international name: Jelawat) threatened to cross extreme Northern Luzon on Thursday as four areas were placed under public storm Signal No. 1 Tuesday.
The Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) raised Signal No. 1 over Isabela, Cagayan, Calayan Group of Islands, and Babuyan Group of Islands as "Lawin" continued to gain strength.
PAGASA warned residents living in low-lying and mountainous areas under public storm warning Signal No. 1 to be on alert against possible flashfloods and landslides.
It also advised fishing boats and other small sea craft not to set sail into the northern and eastern coastlines of Luzon and the coastlines of Visayas and Mindanao due to big waves generated by the typhoon.
If "Lawin" maintains in present track, PAGASA forecaster Meno Mendoza said the typhoon will likely cross the islands of the extreme Northern Luzon by Thursday.
As of 11 a.m. Tuesday, the eye of "Lawin" was at 520 kilometers (km) east of Casiguran, Aurora and was moving north-northwest at 11 kilometers per hour (kph).
Mendoza warned residents in the eastern section of Luzon, particularly areas with storm warning signal to expect heavy to intense rains.
He also said the convergence of winds coming from the southwest and northeast will bring winds and light to moderate rains over Metro Manila and Central Luzon by Tuesday evening.
Likewise, the southwest monsoon enhanced by typhoon "Lawin" will continue to bring moderate to heavy rains in Southern Luzon, Visayas, and Mindanao.
"Lawin" is expected at 395 km east of Tuguegarao City by Wednesday morning. By Thursday morning, it will be 160 km east of Aparri, Cagayan, and 95 km northwest of Calayan Island by Friday morning.