By Marjaleen Ramos Tropical depression "Falcon" may intensify into a tropical storm within the next 24 hours, according to Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) Tuesday. (PAGASA/ MANILA BULLETIN) In its 11 a.m. bulletin, PAGASA said "Falcon" will continue to move westward toward the Philippine Sea. "Falcon" was estimated 510 km east of Tuguegarao City, Cagayan on Tuesday morning. It has maximum sustained winds of 55 kilometer per hour (kph) and gustiness of up to 70 km/h. The provinces of Northern Isabela, Cagayan (including Babuyan Islands) and Batanes remained under Tropical Cyclone Wind Signal No. 1. Areas such as Ilocos Region, Cordillera Administrative Region, Cagayan, Occidental Mindoro, Palawan (including Calamian and Cuyo Islands), Panay Island, and Guimaras will experience moderate to heavy rains today until Wednesday morning. Meanwhile, light to moderate with at times heavy rains will be experienced over the rest of Luzon and Visayas. By Wednesday, moderate to heavy rains may prevail over Ilocos Region, Cordillera Administrative Region, Cagayan, Isabela, Zambales and Occidental Mindoro, while light to moderate with at times heavy rains may prevail over Metro Manila, CALABARZON, and the rest of Cagayan Valley, Central Luzon and MIMAROPA. Residents living in areas identified to be at risk of flooding and landslides were advised to take precautionary measures, coordinate with local disaster risk reduction and management offices, and continue monitoring for updates, especially the storm advisories and heavy rainfall warnings to be issued by PAGASA. Falcon is expected to closely approach or make landfall over Babuyan-Batanes Islands area Wednesday evening and may exit the Philippine Area of Responsibility by Friday.