A low pressure area (LPA) spotted east of Mindanao is affecting parts of the country as it nears landfall on Sunday, the state-run weather bureau said.
The Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa) last spotted the LPA at 85 kilometers east of Hinatuan, Surigao del Sur as of 3 p.m.
Pagasa weather specialist Benison Estareja said the LPA, last spotted at 240 kilometers east of Hinatuan, Surigao derl Sur, might traverse the Visayas and Mindanao until Monday, bringing scattered light to moderate with at times heavy rains during thunderstorms over Occidental and Oriental Mindoro, Marinduque, Romblon, Palawan, Bicol region, the Visayas and Mindanao.
Meanwhile, Batanes, Cagayan, Apayao and Ilocos Norte was expected to experience partly cloudy to cloudy skies with isolated light rains due to the effect of the northeast monsoon or amihan. Only localized thunderstorms were expected in Metro Manila and the rest of Luzon.
Estareja said the LPA is still unlikely to develop into a tropical cyclone in the next two days, but that there were higher chances for it to develop into a tropical depression once it reaches the West Philippine (South China) Sea on Tuesday, either within or outside the Philippine Area of Responsibility (PAR).
He noted, however, that as a storm, it would not directly affect the country since it would be heading to Vietnam. Its outer part may possibly affect Mindoro and Palawan, however.
The LPA, once it intensifies into a storm, will be named “Quiel” — the 17th tropical cyclone to enter or develop within the Philippine Area of Responsibility this year and the second in October.
The LPA will not affect Central Luzon, where the Angat Dam, the primary source of domestic supply of water in Metro Manila, is situated.
The dam’s water level has continued to decline on Sunday with an elevation of 185.41 meters, a 0.23-meter drop from the previous day.
Angat Dam started to decline anew in October after reaching 191 meters during the last week of September. Pagasa hydrologist Edgar de la Cruz has said a total of 954 millimeters (mm) of rainfall in a span of one month would be needed to catapult Angat to the 210-meter normal high water level, the year-end target. But only around 300 mm of rainfall is expected in November.
The National Water Resources Board maintained a 40-cubic-centimeter-per-second (m3/s) water allocation for Metro Manila, lower than the normal 46 m3/s to save up for Metro Manila’s supply for the dry season next year.
Water concessionaires have started to implement rotational service interruptions on Thursday due to the minimal water supply.