PAGASA expects onset of rainy season this week

Manila, Philippines – Cooler days are just around the corner with the expected onset of the rainy season this week, the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) said Sunday.

Since amount of rainfall is one of the indicators for the beginning of the rainy season, PAGASA weather forecaster Chris Perez said a low pressure area (LPA) in the Philippine area of responsibility (PAR) may just deliver enough rains to signal that summer is over.

As of 2 a.m. Sunday, the LPA  was spotted 140 kilometers north northeast of Laoag City, said Perez.

It is expected to bring mostly cloudy skies and scattered rain showers in Luzon, however, the weather system will not likely intensify into a tropical cyclone, he said.

Based on PAGASA’s extended four-day weather outlook, most parts of Luzon, which includes Metro Manila, Tuguegarao City, Laoag City, Baguio City, and SBMA (Olongapo)/Clark Zone (Angeles City), will experience cloudy skies with rain showers and thunderstorms, especially on Wednesday and Thursday.

PAGASA also warned residents in Northern Luzon of flashfloods and landslides caused by widespread rains in the area.

Meanwhile, Visayas and Mindanao will be partly cloudy to cloudy with isolated rainshowers or thunderstorms in the afternoon or evening.

Perez also explained that the heavy downpour experienced in Metro Manila Sunday was due to the prevailing monsoon trough across Luzon, which is the extension of the LPA.

He said the PAGASA will likely declare the onset of rainy season this week.

There are certain criteria before the PAGASA can declare the beginning of the rainy season, which includes the amount of rainfall for five consecutive days in one field synaptic station located in different parts of the country, must register a total of 25 millimeters or more.

Three out of the five days, rainfall must not be lower than one-millimeter per day.

Field synaptic stations are located in Laoag (Ilocos Norte), Vigan (Ilocos Sur), Iba (Zambales), Dagupan (Pangasinan), San Jose (Mindoro), Ambulong (Mindoro), Iloilo, and Metro Manila. (Ellalyn B. De Vera)

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