Pagasa reports declining water levels in major Luzon dams

Water levels in several major dams across Luzon continued to fall as of May 15, the Philippine Atmospheric, Geophysical and Astronomical Services Administration said. The drop comes amid extreme heat and concerns over a possible El Niño.

Angat Dam, the main water source for Metro Manila, fell to 178.52 meters on May 15 from 178.85 meters the previous day. It remains below its operating level of 180 meters.

Ipo Dam dropped to 99.99 meters while La Mesa Dam slipped to 79.86 meters. Several hydroelectric dams in northern and central Luzon also recorded lower elevations, including Ambuklao, Binga, San Roque and Pantabangan.

The Philippine Atmospheric, Geophysical and Astronomical Services Administration linked the trend to high heat indexes that reached danger levels in 45 cities on May 15. Two dams, Magat and Caliraya, showed slight increases.

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Students walking through rain in the Philippines amid class suspensions caused by low pressure weather.
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Low pressure area triggers class suspensions in parts of Philippines

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A low pressure area brought rain and prompted class suspensions across parts of the Visayas and Southern Luzon on June 30, 2026.

The National Water Resources Board is considering cloud-seeding operations over the Angat Watershed as water levels at the dam drop below the minimum operating level. The dam serves as Metro Manila’s main source of potable water. As of Friday, its water elevation reached 178.55 meters.

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The low pressure area formerly known as Tropical Cyclone Caloy is forecast to weaken and dissipate over the Philippine Sea by Friday or Saturday without affecting the country.

Metro Manila and several areas across the Philippines are expected to experience danger-level heat index on Tuesday, May 19, the state weather bureau said.

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The Visayas power grid could face supply shortfalls for one to two years, the Department of Energy said on June 1.

San Carlos Reservoir has dropped to less than 1 percent of capacity following an extreme lack of snow in the Gila River watershed. The low water levels triggered a massive fish kill and prompted an indefinite closure of the site on June 5, 2026.

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The Philippine Atmospheric, Geophysical and Astronomical Services Administration said most parts of the country will experience isolated rain showers due to localized thunderstorms.

 

 

 

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