Northern Luzon to experience rain due to shear line, northern monsoon

Areas in northern Luzon are forecast to see cloudy skies and rain on Wednesday, Dec. 4, 2024, due to combined effects of the northern monsoon and shear line, according to the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (Pagasa). Weather satellite image from Pagasa

MANILA, Philippines — Some areas in northern Luzon are forecast to experience downpours on Wednesday due to the northern monsoon and the shear line, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa) said.

State weather specialist Rhea Torres reported that the Cordillera Administrative Region, Ilocos Norte, Ilocos Sur, and the rest of Cagayan Valley will see cloudy skies with scattered rain showers and thunderstorms caused by the shear line.

“Dulot po ng epekto ng shear line, ilang bahagi po ng hilagang Luzon ay makakaranas ng maulan na panahon. Asahan po natin ‘yung makulimlim na panahon at may mga posibilidad pa rin na mga kalat-kalat na pag-ulan, pagkidlat at pagkulog,” Torres said in a morning report on Wednesday.

(Due to the effects of the shear line, some parts of northern Luzon will experience rainy weather. Expect overcast skies with the possibility of scattered rain showers, thunderstorms, and lightning.)

READ: Intense rains expected in North Luzon areas due to shear line

Pagasa explained that the shear line forms when cold northeast monsoon winds meet the warm easterlies from the Pacific Ocean.

Torres also noted that cloud clusters brought by the northeast monsoon will influence weather conditions in Batanes on Wednesday.

“‘Yung northeast monsoon po natin ay nakakaapekto na lamang dito sa may extreme northern Luzon area. At ayon sa ating latest satellite image, meron po tayong namamataan na linya ng mga kaulapan na nakakaapekto sa may silangang bahagi ng northern Luzon,” she explained.

(The northeast monsoon is now only affecting the extreme northern Luzon area. Based on our latest satellite image, we have observed a line of clouds impacting the eastern portion of northern Luzon.)

Meanwhile, Metro Manila and the rest of the country may expect partly cloudy to cloudy skies with isolated rain showers as a result of localized thunderstorms, Pagasa stated.

“Fair weather conditions po ‘yung inaasahan natin, except na lang po ‘yung mga posibilidad na mga biglaan o mga panandaliang buhos ng ulan dulot ng mga localized thunderstorms na mas madalas pong mararanasan sa hapon at sa gabi,” Torres said.

(We can expect fair weather conditions except for the possibility of sudden or brief downpours caused by localized thunderstorms, which are more likely to occur in the afternoon and evening.)

No gale warning has been raised by Pagasa across the country’s seaboards on Wednesday.

However, it advised the public to exercise caution when sailing in coastal areas of Northern Luzon due to moderate to rough sea conditions.

“Malaya pong makakapalaot ang ating mga kababayan na may mga maliit na sasakyang pandagat. Ibayong pag-iingat lamang po sa may planong pumalaot sa mga dagat baybayin ng Northern Luzon, dahil inaasahan po natin ‘yung katamtaman hanggang sa maalon na karagatan,” Torres said.

(Our fellow citizens with small sea crafts can freely sail. However, extra caution is advised for those planning to sail in the coastal waters of Northern Luzon, as we anticipate moderate to rough sea conditions.)