At least 14 areas were placed under Storm Signal No. 3 Friday evening as Typhoon Santi (Nari) intensified further and continued heading for the Isabela-Aurora area, state weather forecasters said.
PAGASA forecaster Chris Perez said their models show Santi may make landfall between midnight Friday and 3 a.m. Saturday.
"Bahagyang lumakas ang bagyong si Santi habang kumikilos papalapit sa Isabela-Aurora area," he said at a press briefing, parts of which were aired on dzBB radio.
He said their models also indicate Santi will cross Luzon and exit via La Union.
By Sunday evening, he said it is possible Santi will have exited the Philippine area of responsibility.
But he said a second storm, internationally codenamed Wipha, may enter the Philippine area of responsibility Monday.
Once inside the PAR, it will be locally codenamed Tino.
Under Storm Signal No. 3 are (14):
Aurora Isabela Quirino Nueva Vizcaya Ifugao Benguet La Union Ilocos Sur Pangasinan Mountain Province Tarlac Nueva Ecija Northern Quezon including Polilio Island Northern Zambales
Under Signal No. 2 are (12):
Metro Manila Ilocos Norte Northern Cagayan Apayao Kalinga Abra Rest of Zambales Pampanga Bataan Bulacan Rizal Rest of Quezon
Under Signal No. 1 are (9):
Calayan and Babuyan Islands Cavite Batangas Laguna Northern Mindoro Lubang Island Marinduque Camarines provinces Catanduanes
PAGASA's 5 p.m. advisory said Santi was estimated at 150 km east-southeast of Baler, Aurora as of 4 p.m., with maximum sustained winds of 150 kph near the center and gustiness of up to 185 kph.
It said Santi is forecast to move west at 15 kph and may be in the vicinity of Dagupan City Saturday afternoon.
By Sunday afternoon it is expected to be 390 km west of Dagupan City. By Monday afternoon it is expected to be 730 km west of Dagupan City or outside the Philippine Area of Responsibility.
PAGASA said Santi may bring rainfall of 7.5 to 30 mm per hour (heavy to intense) within its 500-km diameter.
It warned residents in low-lying and mountainous areas along Santi's track should be alert against possible flash floods and landslides.
Also, it said those in coastal areas under Signal 2 and 3 should be alert for storm surges of up to four meters.
"Sea travel is risky over the seaboard of Luzon and of Eastern Visayas," it said. — TJD, GMA News