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MANILA - A low pressure area or brewing storm will continue enhancing the habagat or southwest monsoon, bringing more rains over Luzon including Metro Manila, the state weather bureau said Wednesday.

Large parts of Luzon were inundated Tuesday by monsoon rains enhanced by Tropical Storm Henry, which has left the Philippine area of responsbililty.

The low pressure area is expected to intensify within 12 to 24 hours into this week's second storm and will be named Inday.

It is unlikely to hit land, but will enhance monsoon rains over the central and southern sections of Luzon, said PAGASA meteorologist Chris Perez.

PAGASA raised at 8 a.m. an orange rainfall warning, the second highest in a 3-step alert, over Metro Manila, Rizal, Bataan and Zambales. This means that floods are threatening and may enter houses, Perez said.

A yellow warning, the lowest alert, was up in Pampanga, Tarlac, Bulacan, Cavite, Nueva Ecija and northern Quezon, where rains may trigger floods in low-lying areas, added the weather office.

The LPA was 540 kilometers east of Aparri, Cagayan at 3 a.m., while Henry (international name: Son Tinh) was 1,115 kilometers west of Northern Luzon's tip.

The rainy weather is expected to persist until Thursday, PAGASA earlier said. It has forced the cancellation of Wednesday classes in some areas.

Up to 4 storms are expected to enter the country in July, PAGASA had said. Last week, Typhoon Gardo brought heavy rains to the western sections of Luzon and Visayas.

Visit the ABS-CBN Weather Center for the latest weather updates.