The low-pressure area (LPA) spotted off Cagayan province will likely intensify into a tropical cyclone on Friday and further enhance the southwest monsoon that is affecting Luzon and Visayas, the weather bureau said.
Weather forecaster Glaiza Escullar said rains will intensify over the weekend.
The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) earlier said there was little chance for the LPA to turn into a tropical depression but it revised its forecast on Tuesday after intermittent downpours prompted officials in several cities in Metro Manila to cancel classes in all levels.
“Rains in Luzon will likely reintensify this weekend until Monday,” Escullar said.
She warned residents in low-lying communities to be vigilant since the heavy rains may trigger floods and landslides.
As of 4 p.m. yesterday, the LPA was estimated at 815 kilometers east of Calayan Island.
Escullar said the rainfall forecast for Luzon ranges from moderate to occasionally heavy until Wednesday, moderate on Thursday and Friday before intensifying this weekend until Monday.