Philippine tropical cyclones

Signal No. 1 raised in more parts of Cagayan Valley due to Typhoon Bising

Acor Arceo

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Signal No. 1 raised in more parts of Cagayan Valley due to Typhoon Bising

Satellite image of Typhoon Bising (Surigae) as of April 19, 2021, 11 am.

Image from NOAA

PAGASA Weather Specialist Ariel Rojas also says Typhoon Bising (Surigae) is in the middle of two high pressure areas, causing it to move upward slowly

More areas in the region of Cagayan Valley were added to the list of places under Signal No. 1 on Monday morning, April 19, with Typhoon Bising (Surigae) generally inching upward.

Bising was last spotted 235 kilometers east northeast of Virac, Catanduanes, or 360 kilometers east of Daet, Camarines Norte, said the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) in a bulletin at 11 am on Monday.

The typhoon is slowly moving north northwest, lingering over the Philippine Sea.

“Naging ganyan po ang kanyang pagkilos dahil meron po tayong high pressure areas sa kanan at kaliwang bahagi ng bagyo na humaharang dito, kaya magiging mabagal ang kanyang pagkilos pahilaga habang tinatawid ‘yung gitna…ng dalawang high pressure area,” explained PAGASA Weather Specialist Ariel Rojas in a noontime briefing on Monday.

(Bising’s movement is influenced by high pressure areas on the left and the right of the typhoon which are blocking it, so its movement northward will be slow as it crosses between the two systems.)

As expected, Bising maintained its strength, with maximum sustained winds of 195 kilometers per hour (km/h) and gustiness of up to 240 km/h. But PAGASA expects the typhoon to gradually weaken in the coming days.

As of 11 am on Monday, tropical cyclone wind signals are raised in the following areas:

Signal No. 2 (winds of 61 to 120 km/h)
  • Catanduanes
  • eastern part of Camarines Sur (Garchitorena, Presentacion, Caramoan, Sagñay, San Jose, Lagonoy)
  • eastern part of Albay (Tiwi, Malinao, Tabaco City, Malilipot, Santo Domingo, Bacacay, Rapu-Rapu, Legazpi City, Manito)
  • eastern and central parts of Sorsogon (Castilla, Sorsogon City, Prieto Diaz, Gubat, Barcelona, Casiguran, Juban, Magallanes, Bulan, Bulusan, Irosin, Santa Magdalena, Matnog)
  • Northern Samar
  • Samar
  • Eastern Samar
  • Biliran
Signal No. 1 (winds of 30 to 60 km/h)
  • southeastern part of Cagayan (Baggao, Peñablanca)
  • eastern part of Isabela (San Pablo, Maconacon, Tumauini, Divilacan, Ilagan City, Palanan, San Mariano, Dinapigue, San Guillermo, Echague, Benito Soliven, Cabagan, Gamu, Naguilian, Reina Mercedes, Angadanan, Cauayan City, Jones, San Agustin)
  • northeastern part of Quirino (Aglipay, Maddela)
  • northern part of Aurora (Dilasag, Casiguran, Dinalungan)
  • eastern part of Quezon (Calauag, Guinayangan, Tagkawayan, Buenavista, San Narciso, San Andres) including Polillo Islands
  • Camarines Norte
  • rest of Camarines Sur
  • rest of Albay
  • rest of Sorsogon
  • Masbate including Burias and Ticao Islands
  • Leyte
  • Southern Leyte
  • northern part of Cebu (Tabogon, Borbon, San Remigio, Bogo City, Medellin, Daanbantayan), including Bantayan and Camotes Islands
  • Dinagat Islands
  • Siargao and Bucas Grande Islands

PAGASA said tropical cyclone winds that are “at least strong breeze to near gale in strength extend outward up to 440 kilometers” from Bising’s center.

“Destructive typhoon-force winds,” meanwhile, “extend outward up to 110 kilometers” from the center.

PAGASA added that Bising is enhancing the northeasterly wind flow, which will bring strong breeze to near-gale conditions to the following:

  • most of Northern Luzon
  • Aurora
  • remaining parts of Quezon that are not under any tropical cyclone wind signal

Coastal and mountainous areas are more likely to feel the effects of the northeasterly wind flow, according to PAGASA.

The state weather bureau also updated its rainfall forecast. Note the addition of parts of Cagayan Valley as well as part of Aurora for Tuesday, April 20.

Monday, April 19

Moderate to heavy rain, with at times intense rain
  • Bicol
  • Northern Samar
  • Samar
  • Eastern Samar
  • Biliran
  • northern part of Leyte

Tuesday, April 20

Moderate to heavy rain
  • Bicol
  • Northern Samar
Light to moderate rain, with at times heavy rain
  • northern part of Aurora
  • eastern part of mainland Cagayan
  • eastern part of Isabela

There could be floods and landslides in areas affected by the typhoon. (READ: FAST FACTS: Tropical cyclones, rainfall advisories)

PAGASA said Bising is likely to keep moving north or north northwest until Wednesday evening, April 21, or early Thursday morning, April 22. After that, Bising would head northeast or east northeast, moving away from Luzon without making landfall.

At the rate the typhoon is moving, it could leave the Philippine Area of Responsibility (PAR) on Saturday, April 24, or Sunday, April 25.

Forecast track of Typhoon Bising (Surigae) as of April 19, 2021, 11 am.
Image from PAGASA

Bising and the enhanced northeasterly windflow will also continue to affect coastal waters in the next 24 hours.

Travel is risky for all types of vessels in the following seaboards:

Very rough to very high seas (waves 5 to 12 meters high)
  • eastern seaboard of Luzon
Rough to very high seas (waves 2.5 to 7 meters high)
  • northern and eastern seaboards of Eastern Visayas

Small vessels would be at risk in these seaboards and “mariners without the proper experience should immediately seek safe harbor”:

Rough to very rough seas (waves 2.5 to 4.5 meters high)
  • northern and western seaboards of Northern Luzon
  • eastern seaboard of Caraga
Rough seas (waves 2.5 to 4 meters high)
  • remaining seaboards of localities under tropical cyclone wind signals
  • eastern seaboard of Davao Oriental

Small vessels and inexperienced mariners should avoid sailing here:

Moderate to rough seas (waves 1.2 to 3 meters high)
  • western seaboard of Central Luzon

Bising is the Philippines’ second tropical cyclone for 2021. The country usually gets an average of 20 tropical cyclones each year. (READ: LIST: PAGASA’s names for tropical cyclones in 2021)

For the next 6 months, PAGASA estimates the following number of tropical cyclones inside PAR:

  • April – 0 or 1
  • May – 0 or 1
  • June – 1 or 2
  • July – 1 to 3
  • August – 2 or 3
  • September – 2 or 3

– Rappler.com

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Acor Arceo

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