The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) issued a “yellow” rainfall warning in Metro Manila, the provinces of Rizal, Laguna, portions of Bulacan at 5:30 a.m. Wednesday.
In an interview, PAGASA weather forecaster Chris Perez said the rains is due to shear line.
Shear line is rapid change in wind velocity or direction and very narrow zone of abrupt velocity change that creates cloudy skies and induce rains, Perez said.
Under the rainfall warning system, a yellow rainfall advisory is raised when the expected rainfall amount is between 7.5 mm and 15 mm within one hour and likely to continue.
Communities given this advisory are advised to be aware of the weather condition and warned that flooding may be possible in low-lying areas.
It added light to moderate with occasional heavy rains affecting Cavite, Quezon (Gen. Nakar, Infanta and Real), and portions of Bataan, Pampanga and Nueva Ecija which may persist within three hours.
Residents of the above-mentioned areas to take precautionary measures and advised to monitor the weather condition and watch for the next advisory to be issued at 8:30 a.m. today.
Perez said the weather bureau continues to monitor the low pressure area (LPA) inside the country.
He said as of 4 a.m. the LPA was spotted some 500 km east of Hinatuan, Surigao del Sur (8.5˚N, 131.0˚E).
He added the LPA has slim chance to intensify into tropical cyclone but the agency continues to monitor it.
Once it develops into a tropical depression inside the Philippine area of responsibility (PAR) it will be locally named “Paeng”, the 16th tropical cyclone to enter the country this year and the third for this month.
For Wednesday forecast, Perez said due to shear line that will bring cloudy skies with light to moderate rainshowers over Metro Manila, Central Luzon, Calabarzon (Cavite, Laguna, Batangas, Rozal and Quezon), Bicol Region, Central and Eastern Visayas.
Due to trough of LPA, Caraga and Northern Mindanao will experience cloudy skies with light to moderate rainshowers and thunderstorms while the regions Of Cagayan Valley, Cordillera and Ilocos will have partly cloudy to cloudy skies with isolated light rains due to northeasterly windflow, he said.
The rest of the country will be partly cloudy to cloudy with isolated rainshowers or thunderstorms.
In its advisory, PAGASA said moderate to strong winds blowing from the northeast will prevail over Luzon and coming from the east to northeast over Eastern Visayas.
The coastal waters along these areas will be moderate to rough.
Elsewhere, winds will be light to moderate coming from the northeast to north with slight to moderate seas.
The weather bureau also issued a gale warning as the strong to gale force wind due to northeasterly windflow is affecting the northern and eastern seaboards of Northern Luzon.
“Fisherfolks and those using small seacrafts are advised not to venture out over the said seaboards”,”PAGASA warned. PNA