The typhoon-enhanced southwest monsoon or "habagat" will continue to affect the western portion of Luzon in the next three days, the Philippine Atmospheric, Geophysical and Astronomical Services Administration said Monday.

Typhoon Hanna, which exited the Philippine Area of Responsibility, will continue to enhance "habagat", bringing a significant amount of rain to Metro Manila, Ilocos Region, La Union, Abra, Benguet, Tarlac, Nueva Ecija, Pampanga, Bulacan, Rizal, Cavite, Batangas, Occidental Mindoro, Calamian Islands and Zambales.

PAGASA warned that flooding and rain-induced landslides are expected under this weather condition.

On Tuesday, the enhanced southwest monsoon will continue to bring gusty conditions over the following areas not under any Wind Signal, especially in coastal and upland/mountainous areas exposed to winds, including the Batanes, Babuyan Islands, Ilocos Region, Abra, Benguet, Nueva Vizcaya, the southern portion of Aurora, Zambales, Bataan, Bulacan, Metro Manila, Occidental Mindoro, Romblon, Marinduque, Kalayaan Islands, Camarines Provinces and most of Calabarzon.

Gusty winds will prevail over the Batanes, Ilocos Norte, the western portion of Pangasinan and Kalayaan Islands on Wednesday.

PAGASA said the Gale Warning is in effect for the seaboards of Northern Luzon, the western and southern seaboards of Luzon, and the western seaboard of Visaya due to the combined influence of "Hanna" (while outside PAR) and the enhanced southwest monsoon.

PAGASA said it is also closely monitoring cloud formations that may develop into a low-pressure area.

These cloud clusters are forming over the eastern section, it added.

PAGASA said it is "not ruling out the possibility" that it will develop into an LPA in the next few days.