MANILA, Philippines (4th UPDATE) - State weather bureau PAGASA on Monday night raised the red warning signal over Metro Manila because of heavy rains.
In its latest advisory issued 11:30 p.m., the weather agency said heavy and intense rains were observed over the metropolis Monday.
PAGASA said torrential rains with a volume of 40.4mm was recorded in Manila in the past hour. Quezon City received 26.0 mm of rainfall, Taguig got 24.64mm, while 10mm to 30mm per hour of rainfall was observed over the rest of Metro Manila.
Earlier in the night, an accumulated rainfall of 83.5 mm was recorded in Quezon City while Marikina got 63.5mm in the past 3 hours,
PAGASA expects the heavy rains to continue throughout the night.
It warned of flooding in low-lying areas and those located near the river channels.
"Residents in high risk areas are advised to take precautionary measures, monitor the weather condition, and watch out for the next warning," the weather bureau said.
Moderate to heavy rains also fell in Ilocos Sur, La Union, Pangasinan, Benguet, Mountain Province, Bataan, Zambales, Tarlac, Pampanga, and Bulacan, PAGASA said.
La Mesa Dam overflows
The heavy rains have already caused water at La Mesa Dam to overflow Monday night, prompting authorities to raise flood warnings in nearby areas.
Water inside the dam reached its spilling level of 80.15 meters around 7 p.m. Monday night, forcing La Mesa management to release water into the Tullahan river.
It is expected to cause floods in Greater Fairview, North Fairview, Novaliches, and Gulod, San Bartolome, Sta. Monica, and Sta. Lucia up to Valenzuela and Malabon where the Tullahan River passes, dam official George Lantin said.
Meanwhile, flood monitoring at the the Marikina River reached second alarm Monday night after the Sto. Niño station water level measurement reached 16.01 meters.
The heavy downpour triggered floods in parts of Metro Manila, according to the Metropolitan Manila Development Authority (MMDA).
The heavy rains are caused by the shallow low pressure area and the southwest monsoon affecting Luzon and the Visayas, PAGASA said.
Heavy rains since Sunday night have forced more than 5,000 people in Metro Manila to leave their homes, a relief official said.
Floods have affected residents of Navotas,Malabon, Manila, Marikina, Valenzuela City, Quezon City, and Muntinlupa City, according to Director Susana Cruz, chief of the Office of Civil Defense-National Capital Region.
Heavy rains also prompted school officials to suspend classes in Manila, Muntinlupa City, Marikina City, Malabon City, Pateros town and Mandaluyong City, Cruz said.
Benito Ramos, National Disaster Risk Reduction and Management Council executive officer, said heavy rains have affected 193,682 families or 867,799 persons nationwide since last week. - with a report from Arnell Ozaeta, radio dzMM