tropical cyclones in PH

Tropical Storm Maring starts merging with LPA that used to be Nando

Acor Arceo
Tropical Storm Maring starts merging with LPA that used to be Nando

WEATHER SYSTEMS. Satellite image of Tropical Storm Maring (Kompasu) and the low pressure area as of October 9, 2021, 11 pm.


The merger of Tropical Storm Maring (Kompasu) and the low pressure area, formerly Tropical Depression Nando, is likely to be completed by Sunday morning, October 10

Tropical Depression Nando weakened into a low pressure area (LPA) as it started to be absorbed by the stronger Tropical Storm Maring (Kompasu) over the Philippine Sea on Saturday evening, October 9.

The remnant low was located 1,105 kilometers east of Northern Luzon, moving southwest at 25 kilometers per hour (km/h).

Maring, meanwhile, was 670 kilometers east of Virac, Catanduanes, moving north northwest at a faster 30 km/h.

The Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) said the merger of Maring and the LPA is likely to be completed in the next 12 hours, or by Sunday morning, October 10.

PROJECTED PATH. Forecast track of the low pressure area that used to be Tropical Depression Nando, as of October 9, 2021, 11 pm.

At the moment, Maring continues to have maximum sustained winds of 85 km/h and gustiness of up to 105 km/h.

But after the merger, Maring is expected to gradually intensify and could reach severe tropical storm category. (READ: FAST FACTS: Tropical cyclones, rainfall advisories)

As of 11 pm on Saturday, Signal No. 1 was raised for the first time due to Maring. These areas will have strong winds from the tropical storm:

  • Eastern Samar
  • eastern part of Northern Samar (Lapinig, Gamay, Mapanas, Palapag, Laoang, Catubig)
  • Dinagat Islands
  • Surigao del Norte

Coastal and mountainous areas in the following regions will also have occasional gusts on Sunday “due to the expansive wind field of the tropical storm and the gradual enhancement of the southwesterlies and northeasterlies”:

  • extreme Northern Luzon
  • Mimaropa
  • Bicol
  • Visayas
  • Caraga
  • Northern Mindanao

On Sunday, the enhanced southwesterlies will also bring rain to:

  • Western Visayas
  • Palawan
  • Occidental Mindoro

Maring, meanwhile, will trigger light to heavy rain in:

  • rest of Visayas
  • Bicol
  • Caraga

A gale warning was issued at 5 pm on Saturday for the eastern seaboards of the Philippines due to Maring and the northeasterly wind flow. Waters are rough to very rough, with waves 2.8 to 4.5 meters high.

PAGASA advised fishing boats and other small vessels not to sail, while larger vessels must watch out for big waves.

In the remaining seaboards of Luzon and the Visayas and in the northern seaboard of Mindanao, waters are moderate to rough. Travel is risky for small vessels.

PAGASA sees Maring moving over the Luzon Strait and passing close to or over the Babuyan Islands between Monday evening, October 11, and Tuesday morning, October 12.

But the weather bureau warned that the possibility of landfall in mainland Luzon is not being ruled out yet.

Maring is expected to leave the Philippine Area of Responsibility (PAR) on Tuesday evening.

PROJECTED PATH. Forecast track of Tropical Storm Maring (Kompasu) as of October 9, 2021, 11 pm.

Maring is the Philippines’ 13th tropical cyclone for 2021 and the second for October, while Nando was the country’s 14th for the year and the third for the month.

An average of 20 tropical cyclones form within or enter PAR each year. (READ: LIST: PAGASA’s names for tropical cyclones in 2021)

These are PAGASA’s latest estimates for the next six months:

  • October – 2 or 3
  • November – 2 or 3
  • December – 1 or 2
  • January – 0 or 1
  • February – 0 or 1
  • March – 0 or 1

The weather bureau is also monitoring the possible emergence of La Niña 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.