25/09/2025
TROPICAL CYCLONE BULLETIN NR. 13
Typhoon (BUALOI)
Issued at 11:00 PM, 25 September 2025
Valid for broadcast until the next bulletin at 2:00 AM tomorrow.
“OPONG” INTENSIFIES INTO A TYPHOON AND IS NOW APPROACHING EASTERN VISAYAS.
• Location of Center (10:00 PM)
The center of Typhoon OPONG was estimated based on all available data including those from Guiuan Doppler Weather Radar over the coastal waters of Dolores, Eastern Samar (11.9°N, 126.0°E).
• Intensity
Maximum sustained winds of 120 km/h near the center, gustiness of up to 165 km/h, and central pressure of 975 hPa.
• Present Movement
West northwestward at 25 km/h
• Extent of Tropical Cyclone Winds
Strong to typhoon-force winds extend outwards up to 460 km from the center
TROPICAL CYCLONE WIND SIGNALS (TCWS) IN EFFECT
• TCWS No. 4
➣ Wind threat: Storm-force winds
➣ Warning lead time: 12 hours
➣ Range of wind speeds: 118 to 184 km/h (Beaufort 12)
➣ Potential impacts of winds: Significant to severe threat to life and property
LUZON:
Sorsogon and the eastern portion of Masbate (Cataingan, Palanas, Dimasalang, Uson, Mobo, City of Masbate, Baleno, Aroroy, Mandaon, Milagros) including Ticao Island
VISAYAS:
Northern Samar, the northern and central portions of Eastern Samar (Jipapad, Maslog, Arteche, Oras, San Policarpo, Dolores, Can-Avid, Taft, Sulat, San Julian, City of Borongan), and the northern and central portions of Samar (Hinabangan, Paranas, Motiong, San Sebastian, Jiabong, San Jorge, San Jose de Buan, Matuguinao, Calbayog City, Gandara, Santa Margarita, Pagsanghan, Tarangnan, City of Catbalogan, Santo Niño, Almagro, Tagapul-An)
• TCWS No. 3
➣ Wind threat: Storm-force winds
➣ Warning lead time: 18 hours
➣ Range of wind speeds: 89 to 117 km/h (Beaufort 10 to 11)
➣ Potential impacts of winds: Moderate to significant threat to life and property
LUZON:
The rest of Masbate including Burias Island, Albay, the western portion of Camarines Sur (Buhi, Iriga City, Bato, Nabua, Balatan, Baao, Bula, Minalabac, San Fernando, Pamplona, Pasacao, Libmanan), the southern portion of Quezon (San Francisco, San Andres, San Narciso, Mulanay, Buenavista, Catanauan, General Luna, Guinayangan, Lopez, Macalelon), Marinduque, Romblon and the central and southern portions of Oriental Mindoro (Bulalacao, Bongabong, Bansud, Mansalay, Roxas, Gloria, Pinamalayan, Pola, Socorro, Victoria)
VISAYAS:
The rest of Eastern Samar, the rest of Samar, the extreme northern portion of Leyte (Babatngon, San Miguel, Tacloban City, Barugo, Calubian, San Isidro, Leyte, Capoocan, Carigara) and Biliran
• TCWS No. 2
➣ Wind threat: Gale-force winds
➣ Warning lead time: 24 hours
➣ Range of wind speeds: 62 to 88 km/h (Beaufort 8 to 9)
➣ Potential impacts of winds: Minor to moderate threat to life and property
LUZON:
Catanduanes, the rest of Camarines Sur, Camarines Norte, the central and eastern portions of Quezon (Pitogo, Lucena City, Calauag, Pagbilao, Infanta, Tiaong, Unisan, Plaridel, Quezon, San Antonio, Alabat, Candelaria, Lucban, Sampaloc, Padre Burgos, Sariaya, City of Tayabas, Mauban, Dolores, Perez, Agdangan, Gumaca, Atimonan, Real, Tagkawayan), Laguna, Rizal, Cavite, Batangas, the rest of Oriental Mindoro, Occidental Mindoro including Lubang Islands, Calamian Islands , Metro Manila, and the southern portion of Bataan (Mariveles, Pilar, Limay, Orion, City of Balanga, Bagac)
VISAYAS:
The eastern portion of Southern Leyte (Libagon, Anahawan, Hinunangan, San Juan, Silago, Saint Bernard, Hinundayan, Liloan, Pintuyan, San Francisco, San Ricardo, Sogod), the northern and central portions of Leyte (Tunga, Pastrana, Mahaplag, Matag-Ob, Tolosa, Palo, Mayorga, Julita, Dagami, Inopacan, Jaro, Abuyog, Santa Fe, Albuera, Villaba, La Paz, Palompon, Macarthur, Tabontabon, Tanauan, Merida, Ormoc City, Isabel, Javier, Dulag, Alangalang, Hindang, City of Baybay, Burauen, Tabango, Kananga), the northern portion of Cebu (Medellin, Daanbantayan, Tabogon, City of Bogo, San Remigio, Borbon, Sogod, Tabuelan, Tuburan, Catmon, Carmen) including Camotes and Bantayan Islands, the extreme northern portion of Negros Occidental (Toboso, City of Escalante, Sagay City, Cadiz City, Manapla, City of Victorias, Enrique B. Magalona), the northern portion of Iloilo (Estancia, Carles, Balasan, Batad, San Dionisio, Concepcion, Sara, Ajuy, Lemery, Barotac Viejo, San Rafael, San Enrique, City of Passi, Bingawan, Calinog), Capiz, Aklan, and the northwestern portion of Antique (Libertad, Pandan, Sebaste, Culasi) including Caluya Islands
MINDANAO:
Dinagat Islands, Siargao Islands, and Bucas Grande Islands
• TCWS No. 1
➣ Wind threat: Strong winds
➣ Warning lead time: 36 hours
➣ Range of wind speeds: 39 to 61 km/h (Beaufort 6 to 7)
➣ Potential impacts of winds: Minimal to minor threat to life and property
LUZON:
The central and southern portions of Isabela (Alicia, San Mateo, Aurora, Ramon, Naguilian, Dinapigue, San Guillermo, Luna, City of Cauayan, Echague, Angadanan, Benito Soliven, City of Santiago, Reina Mercedes, San Agustin, San Manuel, Cabatuan, Gamu, San Isidro, Cordon, Jones, Burgos, San Mariano, Palanan), Quirino, Nueva Vizcaya, Ifugao, the southwestern portion of Mountain Province (Bauko, Sabangan, Tadian), Benguet, the southern portion of Ilocos Sur (Sugpon, Alilem), La Union, Pangasinan, Aurora, Nueva Ecija, Tarlac, Zambales, the rest of Bataan, Pampanga, Bulacan, the rest of Quezon, Cuyo Islands, and the northern portion of mainland Palawan (El Nido, Taytay, Dumaran, Araceli)
VISAYAS:
The rest of Southern Leyte, the eastern and central portions of Bohol (Getafe, Talibon, Bien Unido, Ubay, Trinidad, Pres. Carlos P. Garcia, Mabini, San Miguel, Alicia, Candijay, Anda, Guindulman, Pilar, Dagohoy, Danao, Buenavista, Inabanga, Clarin, Sagbayan, Carmen, Sierra Bullones, Duero, Jagna), the central portion of Cebu (Asturias, Danao City, Compostela, Liloan, Consolacion, Cebu City, Balamban, Mandaue City, Lapu-Lapu City, Toledo City, City of Talisay, Pinamungahan, Minglanilla, City of Naga, San Fernando, Aloguinsan, City of Carcar, Barili), the northern portion of Negros Oriental (Vallehermoso, Canlaon City, City of Guihulngan), the northern and central portions of Negros Occidental (Calatrava, Salvador Benedicto, San Carlos City, Silay City, City of Talisay, Bacolod City, Bago City, Murcia, La Castellana, Valladolid, Pulupandan, La Carlota City, San Enrique, Pontevedra, Moises Padilla, Isabela, Hinigaran), the central portion of Iloilo (Banate, Anilao, Dueñas, Di**le, Barotac Nuevo, Dumangas, Lambunao, Janiuay, Badiangan, Pototan, Mina, Zarraga, New Lucena, Cabatuan, Maasin), and the central portion of Antique (Tibiao, Barbaza, Bugasong, Laua-An, Valderrama)
MINDANAO:
The rest of Surigao del Norte
OTHER HAZARDS AFFECTING LAND AREAS
➣ Heavy Rainfall Outlook
Refer to Weather Advisory No. 26 issued at 11:00 PM today for the heavy rainfall outlook due to Tropical Cyclone OPONG and the Southwest Monsoon. Link: tinyurl.com/wxadvisory
➣ Severe Winds
The wind signals warn the public of the general wind threat over an area due to the tropical cyclone. Local winds may be slightly stronger/enhanced in coastal and upland/mountainous areas exposed to winds. Winds are less strong in areas sheltered from the prevailing wind direction.
• Significant to severe impacts from typhoon-force winds are possible within any of the areas under Wind Signal No. 4.
• Moderate to significant impacts from storm-force winds are possible within any of the areas under Wind Signal No 3.
• Minor to moderate impacts from gale-force winds are possible within any of the areas under Wind Signal No. 2.
• Minimal to minor impacts from strong winds are possible within any of the areas under Wind Signal No. 1.
The Southwest Monsoon enhanced by OPONG, will bring strong to gale-force gusts over the following areas not under Wind Signal (especially in coastal and upland areas exposed to winds):
• Today: Ilocos Region, Cagayan Valley, Palawan, Visayas, Zamboanga del Norte, Misamis Occidental, Misamis Oriental, Camiguin, Caraga Region, and Davao Region.
• Tomorrow (26 September): Ilocos Region, Cordillera Administrative Region, Cagayan Valley, Palawan, Visayas, Zamboanga del Norte, Misamis Occidental, Misamis Oriental, Camiguin, Caraga Region, and Davao Region.
• Saturday (27 September): Luzon and Western Visayas.
HAZARDS AFFECTING COASTAL WATERS
A Gale Warning is in effect over the eastern and southern seaboards of Southern Luzon and the eastern seaboard of Visayas. Refer to Gale Warning No. 2 issued at 5:00 PM today. Link: tinyurl.com/gale-warning
➣ 24-Hour Sea Condition Outlook
Up to very rough, high, or very high over the following coastal waters:
• Up to 14.0 m: The seaboards of Eastern Samar, Northern Samar, Samar, Biliran, Masbate including Ticao and Burias Islands; the southern and eastern seaboards of Albay and Sorsogon.
• Up to 8.0 m: The seaboards of Romblon, Oriental Mindoro; the northern seaboards of Leyte, Cebu, Iloilo, Capiz, and Aklan.
• Up to 6.0 m: The remaining seaboards of Bicol Region; the southern seaboards of Quezon, Marinduque, and Batangas.
• Up to 5.0 m: The seaboards of Aurora, Occidental Mindoro including Lubang Island, Romblon, and Polillo Islands; the western seaboard of Zambales, Bataan, and Cavite; the remaining seaboards of Batangas.
• Sea travel is risky for all types or tonnage of vessels. All mariners must remain in port or, if underway, seek shelter or safe harbor as soon as possible until winds and waves subside.
Up to rough seas over the following coastal waters:
• Up to 4.0 m: The seaboards of Isabela, Calamian Islands, Cuyo Islands, and Bucas Grande Island; the eastern seaboards of Dinagat and Siargao Islands; the remaining seaboards of Quezon.
• Up to 3.5 m: The eastern seaboards of Cagayan including Babuyan Islands, Pampanga, Bulacan, and Metro Manila; the remaining seaboards or Cavite, Dinagat Islands, and Siargao Island.
• Mariners of small seacrafts, including all types of motorbancas, are advised not to venture out to sea under these conditions, especially if inexperienced of operating ill-equipped vessels.
Up to moderate seas over the following coastal waters:
• Up to 2.5 m: The seaboards of Surigao del Norte, Davao del Sur, and Davao Oriental; the remaining seaboards of Palawan and Visayas.
• Mariners of motorbancas and similarly-sized vessels are advised to take precautionary measures while venturing out to sea and, if possible, avoid navigation under these conditions.
➣ Coastal Inundation
There is high risk of life-threatening storm surge with peak heights exceeding 3.0 m within 36 hours over the low-lying or exposed coastal localities of Zambales, Bataan, Metro Manila, CALABARZON, Occidental Mindoro including Lubang Island, Oriental Mindoro, Marinduque, Romblon, Palawan, Bicol Region, Northern Samar, Eastern Samar, Samar, Biliran, Leyte, Cebu, Aklan, Antique, Capiz, Dinagat Islands, and Siargao Island. Refer to Storm Surge Warning No. 6 issued at 8:00 PM today for the details. Link: tinyurl.com/storm-surge-warning
TRACK AND INTENSITY OUTLOOK
• It must be emphasized that heavy rainfall, severe winds, and storm surge may still be experienced in localities outside the landfall point and the forecast confidence cone. Refer to the hoisted Wind Signals (for direct wind threat of the tropical cyclone) and “Other Hazards affecting Land Areas” for more details. Furthermore, the track may still shift more to the north or to the south but within the limit of the forecast confidence cone.
• OPONG is forecast to make landfall over Northern Samar or the northern portion of Eastern Samar between midnight and tomorrow (26 September) early morning before heading towards Bicol Region, where it is likely to make another landfall in the vicinity of Sorsogon or Masbate tomorrow morning. Throughout tomorrow, OPONG will move generally west northwestward near or over Sibuyan Sea and traverse the mainland and/or island provinces of Bicol Region, southern CALABARZON, and northern MIMAROPA, before emerging over the West Philippine Sea on Saturday (27 September) early morning.
• As OPONG crosses the archipelago, it will likely remain as a typhoon or severe tropical storm during the passage. Re-intensification is highly likely once OPONG emerges over the West Philippine Sea.
(c) PAGASA
