MANILA – The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) forecasts scattered rain showers and isolated thunderstorms across parts of Luzon and Eastern Visayas on Saturday, December 13, 2025, due to the combined effects of a shear line and the northeast monsoon (amihan). While no tropical cyclones are monitored, the systems could trigger flash floods or landslides in vulnerable areas, especially during intense bursts.
The shear line—where warm easterly winds meet cooler amihan air—will primarily affect the eastern sections of Southern Luzon and Visayas, bringing cloudy skies with scattered rains and isolated thunderstorms to:
- Bicol Region
- Eastern Visayas
- Marinduque
- Romblon
The amihan will drive cloudy skies with rains over Quezon province, and partly cloudy to cloudy conditions with isolated light rains across Metro Manila and the rest of Luzon.
Regional Breakdown
- Luzon: Cloudy with scattered rains in Quezon, Bicol, and eastern sections; isolated light rains elsewhere due to amihan.
- Eastern Visayas: Cloudy skies with scattered rains and thunderstorms from the shear line.
- Rest of Visayas and Mindanao: Generally fair but with possible localized thunderstorms in the afternoon/evening.
Winds will be moderate to strong from the northeast over Northern Luzon and eastern sections of Central/Southern Luzon and Visayas, leading to moderate to rough seas (wave heights 2.0-4.0 meters). Small vessels are advised caution.
PAGASA urges monitoring in flood-prone and mountainous areas for possible hazards. No gale warnings are in effect, but conditions could change rapidly.
As weekend plans unfold amid the holiday rush, stay updated via PAGASA’s channels—umbrellas ready, but no major disruptions expected.
Weather Outlook (December 13, 2025):
| Region | Conditions | Rainfall Risk | Seas/Winds |
|---|---|---|---|
| Luzon (Most) | Cloudy; scattered rains (Quezon/Bicol) | Flash floods/landslides possible | Moderate to rough (east) |
| Eastern Visayas | Cloudy; scattered rains/thunderstorms | Isolated heavy bursts | Moderate |
| Visayas/Mindanao | Fair; localized afternoon storms | Low | Slight to moderate |