September 22, 2025 | News by DOST-PAGASA
Weather Advisory No. 12
For: Tropical Cyclone NANDO and Southwest Monsoon
Issued at: Sept. 22, 2025, 5 p.m.
Heavy rainfall outlook due to Tropical Cyclone NANDO
Today to tomorrow afternoon (September 23)
(>200 mm):
Ilocos Norte, Ilocos Sur, La Union, and Benguet
(100-200 mm):
Batanes, Cagayan, Apayao, and Abra
(50-100 mm):
Pangasinan and Zambales
Tomorrow afternoon to Wednesday afternoon (September 24)
(50-100 mm):
Ilocos Norte, Ilocos Sur, and Benguet
Heavy rainfall outlook due to Southwest Monsoon
Today to tomorrow afternoon (September 23)
Moderate to Heavy (50-100 mm):
Bataan and Occidental Mindoro
Tomorrow afternoon to Wednesday afternoon (September 24)
Moderate to Heavy (50-100 mm):
La Union, Pangasinan, Zambales, Bataan, and Occidental Mindoro
Forecast rainfall may be higher in mountainous and elevated areas. Moreover, impacts in some areas may be worsened by significant antecedent rainfall.
The public disaster risk reduction and management offices concerned are advised to take all necessary measures to protect life and property. PAGASA Regional Services Divisions may issue Heavy Rainfall Warnings/Thunderstorm Advisories, and other severe weather information specific to their areas of responsibility as appropriate.
Unless significant changes occur, the next Weather Advisory will be issued at 11:00 PM today.
𝐅𝐨𝐫 𝐀𝐝𝐝𝐢𝐭𝐢𝐨𝐧𝐚𝐥 𝐈𝐧𝐟𝐨𝐫𝐦𝐚𝐭𝐢𝐨𝐧: The key difference between a 𝐇𝐞𝐚𝐯𝐲 𝐑𝐚𝐢𝐧𝐟𝐚𝐥𝐥 𝐖𝐚𝐫𝐧𝐢𝐧𝐠 and a 𝐖𝐞𝐚𝐭𝐡𝐞𝐫 𝐀𝐝𝐯𝐢𝐬𝐨𝐫𝐲 lies in their forecast period, coverage areas, and accuracy. A 𝐇𝐞𝐚𝐯𝐲 𝐑𝐚𝐢𝐧𝐟𝐚𝐥𝐥 𝐖𝐚𝐫𝐧𝐢𝐧𝐠 provides forecasts for the next three hours and applies up to the municipal level. It is more precise as it utilizes Doppler radar technology to track real-time rainfall intensity, making it highly effective for immediate decision-making in flood-prone areas. A 𝐖𝐞𝐚𝐭𝐡𝐞𝐫 𝐀𝐝𝐯𝐢𝐬𝐨𝐫𝐲, on the other hand, covers a 24-hour period but is issued only at the provincial level. It provides a broader outlook on potential weather disturbances but lacks the short-term accuracy of 𝐇𝐞𝐚𝐯𝐲 𝐑𝐚𝐢𝐧𝐟𝐚𝐥𝐥 𝐖𝐚𝐫𝐧𝐢𝐧𝐠𝐬. For class suspensions or other official decisions, please refer to 𝐇𝐞𝐚𝐯𝐲 𝐑𝐚𝐢𝐧𝐟𝐚𝐥𝐥 𝐖𝐚𝐫𝐧𝐢𝐧𝐠𝐬 issued by the respective PAGASA Regional Services Divisions.