22/08/2025
TROPICAL CYCLONE BULLETIN NR. 4
Tropical Depression
Issued at 8:00 PM, 22 August 2025
Valid for broadcast until the next bulletin at 11:00 PM today.
“ISANG” CONTINUES TO MOVE WEST NORTHWESTWARD AND IS NOW OVER IFUGAO PROVINCE.
Location of Center (7:00 PM): The center of Tropical Depression ISANG was estimated based on all available data including those from Benguet Doppler Weather Radar in the vicinity of Lagawe, Ifugao (16.8°N, 121.2°E).
Intensity: Maximum sustained winds of 55 km/h near the center, gustiness of up to 90 km/h, and central pressure of 1002 hPa
Present Movement: West northwestward at 15 km/h
Extent of Tropical Cyclone Winds: Strong winds extend outwards up to 150 km from the center
TROPICAL CYCLONE WIND SIGNALS (TCWS) IN EFFECT
TCWS No. 1
Wind threat: Strong winds
Luzon
Cagayan, Isabela, Quirino, Nueva Vizcaya, Apayao, Kalinga, Abra, Mountain Province, Ifugao, Benguet, Ilocos Norte, Ilocos Sur, La Union, Pangasinan, Aurora, and the northern portion of Nueva Ecija (Lupao, Carranglan, Pantabangan, San Jose City)
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
OTHER 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.
The next tropical cyclone bulletin will be issued at 11:00 PM today.
Courtesy: DOST-PAGASA
