This outlook is published by PAGASA at 12nn of Friday, December 12th and valid until 12nn of Friday, December 19th.

DEC. 13-14: THE SHEAR LINE WILL AFFECT THE EASTERN SECTIONS OF SOUTHERN LUZON AND VISAYAS, BRINGING CLOUDY SKIES WITH SCATTERED RAINS AND ISOLATED THUNDERSTORMS OVER BICOL REGION, EASTERN VISAYAS, LAGUNA, RIZAL, QUEZON, ORIENTAL MINDORO, MARINDUQUE, AND ROMBLON. MEANWHILE, THE STRENGTHENING SURGE OF THE NORTHEAST MONSOON (AMIHAN) WILL BRING CLOUDY SKIES WITH SCATTERED RAINS OVER CAGAYAN VALLEY AND AURORA, AND PARTLY CLOUDY TO CLOUDY SKIES WITH ISOLATED LIGHT RAINS OVER METRO MANILA, ILOCOS REGION, CORDILLERA ADMINISTRATIVE REGION (CAR), AND THE REST OF CENTRAL LUZON. THE REST OF THE COUNTRY WILL HAVE PARTLY CLOUDY TO CLOUDY SKIES WITH ISOLATED RAINSHOWERS OR THUNDERSTORMS.

DEC. 15-17: THE SHEAR LINE WILL CONTINUE TO BRING CLOUDY SKIES WITH SCATTERED RAINS AND ISOLATED THUNDERSTORMS OVER BICOL REGION, EASTERN VISAYAS, CAGAYAN, ISABELA, QUIRINO, AURORA, AND QUEZON. CLOUDY SKIES WITH SCATTERED RAINS WILL STILL PREVAIL OVER CAR AND THE REST OF CAGAYAN VALLEY WHILE THE REST OF LUZON WILL EXPERIENCE PARTLY CLOUDY TO CLOUDY SKIES WITH ISOLATED LIGHT RAINS CAUSED BY AMIHAN. MINDANAO AND THE REST OF VISAYAS WILL HAVE PARTLY CLOUDY TO CLOUDY SKIES APART FROM LOCALIZED RAINSHOWERS OR THUNDERSTORMS.

DEC. 18-19: CLOUDY SKIES WITH SCATTERED RAINS AND ISOLATED THUNDERSTORMS WILL STILL BE EXPERIENCED OVER BICOL REGION, EASTERN VISAYAS, AND QUEZON DUE TO SHEAR LINE. CAGAYAN VALLEY AND CAR WILL STILL HAVE CLOUDY SKIES WITH SCATTERED RAINS WHILE ILOCOS REGION AND THE REST OF CENTRAL LUZON WILL REMAIN PARTLY CLOUDY TO CLOUDY WITH ISOLATED LIGHT RAINS DUE TO THE AMIHAN. METRO MANILA AND THE REST OF THE COUNTRY WILL STILL BE PARTLY CLOUDY TO CLOUDY WITH BRIEF RAINSHOWERS OR THUNDERSTORMS.

This means, Shear Line, Northest Monsoon, and Easterlies will affect the country for the entire week.

This weather outlook will be updated should there be significant changes in the forecast scenario through the issuance of 24-Hour Public Weather Forecasts and Weather Advisories.

SOURCE: https://bagong.pagasa.dost.gov.ph/weather/weather-outlook-weekly