菲律宾大气地球物理和天文服务管理局表示，截至5月15日，吕宋岛多个主要水库的水位持续下降。在极端高温和厄尔尼诺现象可能引发担忧的背景下，水位出现下滑。
马尼拉大都会的主要水源安格特大坝（Angat Dam）的水位从5月14日的178.85米降至5月15日的178.52米，仍低于其180米的运行水位。
伊波大坝（Ipo Dam）水位降至99.99米，拉梅萨大坝（La Mesa Dam）水位降至79.86米。吕宋岛北部和中部的多个水电大坝，包括安布考大坝（Ambuklao）、宾加大坝（Binga）、圣罗克大坝（San Roque）和潘塔邦岸大坝（Pantabangan）的水位也均有下降。
菲律宾大气地球物理和天文服务管理局将这一趋势归因于5月15日全国45个城市出现的高温指数，该指数已达到危险水平。马加特大坝（Magat）和卡利拉亚大坝（Caliraya）的水位则略有上升。
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The Philippine weather bureau on Tuesday said it is tracking two low-pressure areas that are not expected to develop into tropical cyclones or bring direct effects to the country.
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.
The low-pressure area inside the Philippine area of responsibility will not directly affect the landmass and is unlikely to redevelop into a tropical cyclone, the state weather bureau said on Saturday.
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A frontal system brought uneven rainfall to the Santiago region on Wednesday, with accumulations ranging from under 1 mm to over 23 mm, plus power cuts that hit nearly 47,000 customers.
The Playas reservoir has reached 110.5% of its capacity, starting spills of 2.0 GWh and becoming the third in this condition. The Superintendencia de Servicios Públicos Domiciliarios reports three reservoirs in simultaneous overcapacity: Playas, Ituango, and Urrá I. Topocoro, at 96.2% fill, may soon join due to the high flow of the Sogamoso River.
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Recent heavy rains in the Little Karoo and Gouritz catchment have significantly improved dam levels, providing relief to water-stressed areas in the Western Cape. Towns around Ladismith saw dramatic overnight improvements following unexpected downpours two weeks ago.