Under present weather conditions, At 3:00 PM today, the center of Tropical Depression "ISANG" was estimated based on all available data in the vicinity of Maddela, Quirino (16.4°N, 121.8°E), with maximum sustained winds of 55 km/h near the center and gustiness of up to 90 km/h. It is moving West northwestward at 15 km/h. Southwest Monsoon affecting Southern Luzon, Visayas, and Mindanao. The 12-hour rainfall forecast is light to occasionally moderate rains and thunderstorms. WATERCOURSES STILL LIKELY TO BE AFFECTED : + **Cagayan** - Rivers and its tributaries particularly Linao, Lower Abulug, Lower Pamplona, Cabicungan, Aunugay, Baua, Palawig and Taboan. + **Isabela** - Rivers and its tributaries particularly Dikatayan, Divilacan and Palanan-Pinacanauan. + **Nueva Vizcaya** - All rivers and its tributaries + **Quirino** - All rivers and its tributaries
People living near the mountain slopes and in the low lying areas of the above mentioned river systems and the **Local Disaster Risk Reduction and Management Councils** concerned still advised to take necessary precautionary measures.
A tropical cyclone will affect the locality. Winds of 39-61 kph or intermittent rains may be expected within 36 hours. “ISANG” CONTINUES TO MOVE WEST NORTHWESTWARD AND IS NOW OVER IFUGAO PROVINCE. Location of eye/center : The center of Tropical Depression ISANG was estimated based on all available data including those from Benguet Doppler Weather Radar at in the vicinity of Lagawe, Ifugao (16.8, 121.2). Strength : Maximum winds of 55 kph near the centerand gustiness of up to 90 kph. Forecast movement : Forecast to move West Northwestward at 15 kph Forecast position : Aug 23, 2025 05:00 AM - 290 km West of Bacnotan, La Union Aug 23, 2025 05:00 PM - 565 km West of Bacnotan, La Union (OUTSIDE PAR) Aug 24, 2025 05:00 AM - 810 km West of Northern Luzon (OUTSIDE PAR) Aug 24, 2025 05:00 PM - 1,045 km West of Northern Luzon (OUTSIDE PAR) Aug 25, 2025 05:00 AM - 1,255 km West Northwest of Central Luzon (OUTSIDE PAR) HAZARDS AFFECTING LAND AREAS Heavy Rainfall Outlook Refer to Weather Advisory No. 5 issued at 5:00 PM today for the heavy rainfall outlook due to ISANG and the Southwest Monsoon. 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. Minimal to minor impacts from strong winds are also possible within any of the areas under Wind Signal No. 1. The Southwest Monsoon slightly enhanced by ISANG will bring strong to gale-force gusts over the following areas (especially in coastal and upland areas exposed to winds): Today: Zambales, Bataan, Metro Manila, CALABARZON, MIMAROPA, Camarines Norte, Camarines Sur, Catanduanes, Burias Island, Western Visayas, Negros Island Region, Central Visayas, Dinagat Islands, Southern Leyte, Surigao del Norte, and Camiguin. Tomorrow (23 August): Batanes, Cagayan, Ilocos Region, Cordillera Administrative Region, Zambales, Bataan, Tarlac, Pampanga, Bulacan, Metro Manila, Cavite, Rizal, Palawan, Occidental Mindoro, Romblon, Burias Island, Camarines Sur. Sunday (24 August): Kalayaan Islands. HAZARDS AFFECTING COASTAL WATERS 24-Hour Sea Condition Outlook No Gale Warning hoisted at this time. Up to rough seas over the following coastal waters: Up to 3.0 m: The seaboards of Batanes and Cagayan. Mariners of small seacrafts, including all types of motorbancas, are advised not to venture out to sea under these conditions, especially if inexperienced or operating ill-equipped vessels. Up to moderate seas over the following coastal waters: Up to 2.5 m: The seaboards of Isabela, Ilocos Norte, and Ilocos Sur. Up to 2.0 m: The seaboards of Aurora and Zambales; the western seaboards of Bataan and Lubang Island. 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. TRACK AND INTENSITY OUTLOOK Tropical Depression ISANG will traverse Northern Luzon and emerge over the West Philippine Sea tonight, and eventually exit the Philippine Area of Responsibility tomorrow (23 August) morning or afternoon. ISANG is forecast to intensify into a tropical storm tomorrow morning or afternoon and may reach severe tropical storm category while approaching the waters south of Hainan, China. However, intensification into a tropical storm at a much earlier time (e.g., several hours after emerging over the West Philippine Sea) is not ruled out.
Considering these developments, the public and disaster risk reduction and management offices concerned are advised to take all necessary measures to protect life and property. Persons living in areas identified to be highly or very highly susceptible to these hazards are advised to follow evacuation and other instructions from local officials. For heavy rainfall warnings, thunderstorm/rainfall advisories, and other severe weather information specific to your area, please monitor products issued by your local PAGASA Regional Services Division.
A tropical cyclone will affect the locality. Winds of 39-61 kph or intermittent rains may be expected within 36 hours. “ISANG” CONTINUES TO MOVE WEST NORTHWESTWARD AND IS NOW OVER IFUGAO PROVINCE. Location of eye/center : The center of Tropical Depression ISANG was estimated based on all available data including those from Benguet Doppler Weather Radar at in the vicinity of Lagawe, Ifugao (16.8, 121.2). Strength : Maximum winds of 55 kph near the centerand gustiness of up to 90 kph. Forecast movement : Forecast to move West Northwestward at 15 kph Forecast position : Aug 23, 2025 05:00 AM - 290 km West of Bacnotan, La Union Aug 23, 2025 05:00 PM - 565 km West of Bacnotan, La Union (OUTSIDE PAR) Aug 24, 2025 05:00 AM - 810 km West of Northern Luzon (OUTSIDE PAR) Aug 24, 2025 05:00 PM - 1,045 km West of Northern Luzon (OUTSIDE PAR) Aug 25, 2025 05:00 AM - 1,255 km West Northwest of Central Luzon (OUTSIDE PAR) HAZARDS AFFECTING LAND AREAS Heavy Rainfall Outlook Refer to Weather Advisory No. 5 issued at 5:00 PM today for the heavy rainfall outlook due to ISANG and the Southwest Monsoon. 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. Minimal to minor impacts from strong winds are also possible within any of the areas under Wind Signal No. 1. The Southwest Monsoon slightly enhanced by ISANG will bring strong to gale-force gusts over the following areas (especially in coastal and upland areas exposed to winds): Today: Zambales, Bataan, Metro Manila, CALABARZON, MIMAROPA, Camarines Norte, Camarines Sur, Catanduanes, Burias Island, Western Visayas, Negros Island Region, Central Visayas, Dinagat Islands, Southern Leyte, Surigao del Norte, and Camiguin. Tomorrow (23 August): Batanes, Cagayan, Ilocos Region, Cordillera Administrative Region, Zambales, Bataan, Tarlac, Pampanga, Bulacan, Metro Manila, Cavite, Rizal, Palawan, Occidental Mindoro, Romblon, Burias Island, Camarines Sur. Sunday (24 August): Kalayaan Islands. HAZARDS AFFECTING COASTAL WATERS 24-Hour Sea Condition Outlook No Gale Warning hoisted at this time. Up to rough seas over the following coastal waters: Up to 3.0 m: The seaboards of Batanes and Cagayan. Mariners of small seacrafts, including all types of motorbancas, are advised not to venture out to sea under these conditions, especially if inexperienced or operating ill-equipped vessels. Up to moderate seas over the following coastal waters: Up to 2.5 m: The seaboards of Isabela, Ilocos Norte, and Ilocos Sur. Up to 2.0 m: The seaboards of Aurora and Zambales; the western seaboards of Bataan and Lubang Island. 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. TRACK AND INTENSITY OUTLOOK Tropical Depression ISANG will traverse Northern Luzon and emerge over the West Philippine Sea tonight, and eventually exit the Philippine Area of Responsibility tomorrow (23 August) morning or afternoon. ISANG is forecast to intensify into a tropical storm tomorrow morning or afternoon and may reach severe tropical storm category while approaching the waters south of Hainan, China. However, intensification into a tropical storm at a much earlier time (e.g., several hours after emerging over the West Philippine Sea) is not ruled out.
Considering these developments, the public and disaster risk reduction and management offices concerned are advised to take all necessary measures to protect life and property. Persons living in areas identified to be highly or very highly susceptible to these hazards are advised to follow evacuation and other instructions from local officials. For heavy rainfall warnings, thunderstorm/rainfall advisories, and other severe weather information specific to your area, please monitor products issued by your local PAGASA Regional Services Division.
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