PAGASA forecasts

LPA, ITCZ to trigger rain in Northern Samar, Southern Luzon

Acor Arceo
LPA, ITCZ to trigger rain in Northern Samar, Southern Luzon

LPA. Satellite image of the low pressure area as of September 16, 2021, 11:20 pm.


The low pressure area and the intertropical convergence zone will bring moderate to heavy rain to Northern Samar, Quezon, Mimaropa, and Bicol on Friday, September 17

More rain is expected on Friday, September 17, from a low pressure area (LPA) and the intertropical convergence zone (ITCZ).

The LPA was last spotted 50 kilometers northeast of Guiuan, Eastern Samar, still embedded in the ITCZ, late Thursday evening, September 16.

In an advisory, the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) said the LPA remains “less likely” to become a tropical depression on Friday.

But it will move west northwest toward Bicol and Mimaropa, and trigger more rain, along with the ITCZ.

Below is the rainfall forecast for Friday.

Moderate to heavy rain
  • Northern Samar
  • Quezon
  • Mimaropa
  • Bicol
Light to moderate rain, with at times heavy rain
  • rest of Visayas
  • Aurora
  • Zamboanga Peninsula
  • Bangsamoro Autonomous Region in Muslim Mindanao
  • Surigao del Norte

Affected areas should watch out for isolated flash floods and landslides. (READ: FAST FACTS: Tropical cyclones, rainfall advisories)

The weather bureau earlier said other parts of the Philippines may see isolated rain showers or localized thunderstorms.

The country has had 11 tropical cyclones in 2021 – most recently the back-to-back Typhoon Jolina (Conson) and Typhoon Kiko (Chanthu).

If the LPA develops into a tropical depression, it would be given the local name Lannie. (READ: LIST: PAGASA’s names for tropical cyclones in 2021)

There is also a possibility of La Niña emerging in the fourth quarter of 2021. –

Acor Arceo

Acor Arceo is the head of copy and editorial standards at Rappler. Trained in both online and TV newsrooms, Acor supervises Rappler’s coverage of disasters, handles the business desk, and ensures consistency in editorial standards across all sections.