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Manila Bulletin devider Philippines devider National devider PAGASA sees on time arrival of rainy season

PAGASA sees on time arrival of rainy season

Published May 22, 2021 11:11 am

The "normal" onset of the rainy season for areas under Type I climate is expected to commence between the second half of May and the first half of June, said the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA).

Areas under Type I climate classification have two pronounced seasons--dry from November to April and wet during the rest of the year.

PAGASA said the period of maximum rain in these areas also coincides with the peak of the southwest monsoon or "habagat" from July to September.

In 2020, PAGASA declared the onset of the rainy season in the country on June 12.

(JANSEN ROMERO / FILE PHOTO / MANILA BULLETIN)

For the rainy season to be officially declared, a number of criteria or conditions have to be met.

These are:

  • A start of a five-day period in May, June, or July with a total rainfall of 25 millimeters or more, and at least one-millimeter rainfall for three consecutive days.
  • At least seven monitoring stations or more than 50 percent of the total stations must satisfy the first criterion. For Metro Manila stations, at least two stations must meet the same criteria.

The 13 monitoring stations under Type I climate are as follows:

Laoag City, Ilocos Norte

Vigan City (Sinait), Ilocos Sur

Dagupan City, Pangasinan

Iba, Zambales

San Jose, Occidental Mindoro

Metro Manila (Science Garden, Quezon City; Port Area, Manila; Sangley Point, Cavite; Ninoy Aquino International Airport, Pasay City)

Ambulong, Batangas

Iloilo

Muñoz, Nueva Ecija

Clark, Pampanga

Cubi Point, Subic Bay, Olongapo City

Coron, Palawan

Cuyo, Palawan

  • For the wind criteria, prevailing winds should have westerly components over the western Philippines from the surface up to the 850 hPa level, as they relate to the development of the synoptic scale rainfall-causing weather patterns.
  • The onset will be declared once the criteria were observed and satisfied. The onset dates will be the consecutive five days wherein these criteria were met.

In the PAGASA's weather bulletin on Saturday, May 22, the intertropical convergence zone (ITCZ) is still expected to bring scattered rain showers and thunderstorms over Davao Oriental, Davao Occidental, Davao del Norte, Davao del Sur, Davao de Oro, South Cotabato, Cotabato, Sultan Kudarat, Sarangani, Basilan, Sulu, Tawi-Tawi, Maguindanao, and Lanao del Sur.

PAGASA asked the public to stay vigilant against flash floods or landslides due to possible moderate to at times heavy rains.

Meanwhile, Metro Manila and the rest of the country will have warm and humid weather conditions due to the prevalence of the easterlies.

Weather specialist Loriedin dela Cruz said these areas may continue to experience hot and humid weather due to "suppressed rainfall."

However, there could be isolated and short-lived rains due to localized thunderstorms mostly in the afternoon or evening.

Dela Cruz said PAGASA has not monitored a tropical cyclone that may affect the country this weekend.

Related Tags

PAGASA rainy season Habagat
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