Tropical depression "Fabian" and a low pressure area (LPA) are expected to further enhance the effect of the southwest monsoon or "habagat" over the country in the next 24 hours, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) said in its 11 p.m. bulletin on Saturday, July 17.
Moderate to at times heavy monsoon rains may affect Palawan, Occidental Mindoro, Aklan, Antique, Capiz, Guimaras, Iloilo, and Negros Occidental.
PAGASA warned against possible flash floods or rain-induced landslides during heavy or prolonged rainfall, particularly in areas that are highly susceptible to these hazards.
Metro Manila and the rest of the country may also experience partly cloudy to cloudy conditions with rain showers or thunderstorms.
As of 10 p.m., Saturday, the center of Fabian was estimated at 1,110 kilometers east of extreme northern Luzon, while it maintained its maximum sustained winds of 55 kilometers per hour (kph) near the center and gustiness of up to 70 kph.
PAGASA said the cyclone may intensify into a tropical storm within six to 12 hours, and into a typhoon by Tuesday, July 20.
Aside from Fabian, the State weather bureau pointed out that an LPA outside the country's area of responsibility, or at 595 km west of Calayan, Cagayan, was also enhancing the impact of the southwest monsoon.
"Fabian will remain far from the Philippine landmass throughout the forecast period. The tropical cyclone will maintain a north-northwestward or northwestward track at a consistent speed until Monday evening when it is forecast to exit the Philippine area of responsibility," PAGASA said.