MANILA -- State weather bureau PAGASA warned Monday of a potential overflow of La Mesa Dam in Quezon City, which could affect low-lying areas in parts of Metro Manila.

As of 1 p.m., the water level at La Mesa Dam has reached 80 meters and is expected to rise further due to the heavy rainfall from tropical storm Enteng, PAGASA said.

"Excess floodwaters in La Mesa Dam will overflow if the dam elevation reaches 80.15 [meters]," it said.

Water from the dam is expected to affect low-lying areas along the Tullahan River in Quezon City (Fairview, Forest Hills Subdivision, Quirino Highway, Sta. Quiteria and San Bartolome), Valenzuela (North Expressway and La Huerta Subdivision), and Malabon.

PAGASA advised residents in those areas "to be alert for further increase of water level along Tullahan River."

Enteng, which has dumped rains that submerged parts of the country in floowdwater, was last spotted over the coastal waters of Casiguran, Aurora, PAGASA said in its 2 p.m. bulletin.

Enteng is expected to cross Northern Luzon and emerge over the northern West Philippine Sea before leaving the Philippine area of responsibility on Wednesday.