Heavy rainfall, siltation, high tide among possible causes of Marikina River overflow — USec. Solidum

Marje Pelayo   •   November 13, 2020   •   1585

MANILA, Philippines — Residents of Marikina City and the city government did not expect the sudden increase in Marikina River’s water level in the course of Typhoon Ulysses.

The river burst its banks reaching 22 meters high around 11:00 AM on Thursday (November 12).

Mayor Marcelino Teodoro said that yesterday’s water level surpassed that of Typhoon Ondoy in 2009 which was at 21.5 meters.

The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) explained that the volume of rain brought by typhoon Ulysses was higher as compared to Typhoon Rolly but still, Typhoon Ondoy had the highest level of rains.

“Iyong kay Bagyong Ondoy, siya ay tropical storm noong dumaan  pero napakarami niyang dalang ulan. At noong panahong dumaan si Ondoy, mabagal ang pagkilos noong tumawid ito doon sa Central Luzon at panahon din noon ng habagat,” noted PAGASA weather specialist Arial Rojas.

(‘Ondoy’ was a tropical storm that carried immense amount of rain. Aside from moving very slowly over Central Luzon, it was also during the southwest monsoon season.)

Meanwhile, DOST Undersecretary Renato Solidum of the agency’s Disaster Risk Reduction And Climate Change Adaptation Division said that what happened in Marikina City was a flash flood coming from the nearby mountain.

He said that perhaps the soil had been saturated from the previous typhoons prior to Typhoon Ulysses.

The soil could no longer hold the amount of water with the addition of heavy rains from Typhoon Ulysses hence the flash flood.

“Maliwanag naman na 250 to 300 mm of rain, so malaking baha na iyon kaya nga nagbigay ang PAGASA ng flash flood warning (Rains of about 250 to 350 mm could cause massive flooding that’s the reason why PAGASA issued flash flood warnings),” Solidum explained.

Also, the official believes that the physical structure of the river has changed in the past 11 years particularly its depth which could be due to siltation.

Magmula noong Ondoy hanggang ngayon palaging may pag-ulan na nangyayari sa Sierra Madre at ang nangyayari dito, iyong ilog ay bababaw nang bababaw dahil sa mga dinadalang sediments, mga putik o kaya silt o buhangin magmula sa kabundukan at paminsan may mga malalaki pang piraso kaya bababaw talaga yung ilog,” he noted.

(Since Ondoy and up to now, there has been regular occurrence of rainfall in the Sierra Madre [mountain ranges]. The sediments, mud and silt — even boulders at times — that stream down the mountain and into river have caused the riverbed to become shallow.)

Another factor, Solidum explained, was the construction of houses near the river banks which could have affected the waterway. The construction of concrete floorings may have limited the ability of the soil to absorb water.

The dwindling forest cover of nearby mountains is another issue that Solidum said needs to be checked based on the high turbidity level in Marikina River.

The high tide in Manila Bay could have also contributed to the rise in flood water, Soludim said.

Given these factors, Usec. Solidum advises the local government units and the public to always heed warnings and advisories of concerned agencies like PAGASA to be able to prepare appropriate measures prior to the onset of a calamity.

Pwedeng mag pre-emptive evacuation na kaagad para sa priority areas na babahain at yung mga delikado tulad ng mga matatanda, maysakit, bata, pregnant (They may conduct preemptive evacuation in priority areas that are flood-prone. They may evacuate first those who are vulnerable like the elderly, the sick, the children and pregnant women),” he said.

“Kung may maiiwan man sa mga bahay, sila na yung kailangang mag evacuate pag naabot na yung critical level (If they decide that somebody should stay, that person must have the capacity to evacuate once flood water reaches critical level),” he concluded. MNP (with reports from Rey Pelayo)

PAGASA raises signal no. 3 as Odette moves towards Palawan

Robie de Guzman   •   December 17, 2021

MANILA, Philippines — State weather bureau PAGASA has raised tropical cyclone wind signal (TCWS) number 3 over parts of Palawan as Typhoon Odette approaches the province.

In its 2 p.m. bulletin, PAGASA said Odette has maintained its strength, with maximum sustained winds of 155 kilometers per hour (km/h) near the center, gustiness of up to 215 km/h, and central pressure of 955 hPa.

It was located at 130km southwest of Cuyo, Palawan or 155 km east northeast of Puerto Princesa City, Palawan. It is moving westward at 25 km/h.

TCWS no. 3 is up in the northern portion of Palawan (El Nido, Taytay, Araceli, Dumaran, Roxas, San Vicente, Puerto Princesa City) including Cagayancillo and Cuyo Islands.

TCWS no. 2 has been raised over the following areas:

  • southern portion of Oriental Mindoro (Bulalacao, Mansalay, Roxas)
  • southern portion of Occidental Mindoro (Calintaan, Rizal, San Jose, Magsaysay)
  • central portion of Palawan (Narra, Sofronio Española, Quezon, Aborlan, Rizal, Brooke’s Point) including Kalayaan and Calamian
  • southwestern portion of Negros Occidental (Cauayan, Candoni, Ilog, Hinoba-An, City of Sipalay)
  • Antique
  • the northwestern and western portions of Aklan (Malinao, Madalag, Libacao, Buruanga)
  • southwestern portion of Capiz (Jamindan, Tapaz)
  • central and southern portions of Iloilo (Bingawan, Calinog, Dueñas, Lambunao, Badiangan, Janiuay, Cabatuan, Mina, New Lucena, Maasin, Alimodian, Leon, Zarraga, Pototan, Santa Barbara, Leganes, Iloilo City, Pavia, Oton, San Miguel, Tigbauan, Igbaras, Tubungan, Guimbal, Miagao, San Joaquin)
  • Guimaras

Meanwhile, signal no. 1 is up in the following areas:

  • Batangas
  • southeastern portion of Quezon (San Francisco, San Andres, San Narciso, Mulanay, Catanauan)
  • Marinduque
  • Masbate (Esperanza, Mandaon, Palanas, Baleno, Placer, Cawayan, Milagros, Dimasalang, Uson, Cataingan, Pio V. Corpuz, Balud, City of Masbate, Aroroy, Mobo)
  • Romblon
  • western portion of Bohol (Getafe, Talibon, Trinidad, Bien Unido, San Miguel, Dagohoy, Carmen, Dimiao, Danao, Buenavista, Inabanga, Sagbayan, Clarin,
  • Catigbian, Batuan, Bilar, Lila, Loay, Loboc, Sevilla, Tubigon, Balilihan, San
  • Isidro, Calape, Loon, Antequera, Maribojoc, Cortes, Corella, Sikatuna, Alburquerque, Baclayon, Tagbilaran City, Dauis, Panglao)
  • Siquijor
  • Cebu including Bantayan Islands
  • the rest of Negros Occidental
  • Negros Oriental
  • the rest of Capiz
  • the rest of Iloilo
  • the rest of Aklan
  • northern portion of Zamboanga del Norte (Baliguian, Gutalac, Kalawit, Labason, Liloy, Tampilisan, Salug, Godod, Bacungan, Sindangan, Siayan, Jose Dalman, Manukan, Pres. Manuel A. Roxas, Katipunan, Sergio Osmeña Sr., Dipolog City, Polanco, Piñan, Mutia, Dapitan City, La Libertad, Sibutad, Rizal)
  • the northern portion of Misamis Occidental (Don Victoriano Chiongbian, Aloran, Oroquieta City, Lopez Jaena, Concepcion, Sapang Dalaga, Calamba, Baliangao, Plaridel)

PAGASA said Odette is forecast to make landfall in the vicinity of northern or central portion of Palawan on Friday afternoon.

It is expected to exit the Philippine area of responsibility by Saturday.

Odette continues to weaken while passing over Sulu Sea

Maris Federez   •   December 17, 2021

MANILA, Philippines — Typhoon Odette is now passing over the Sulu Sea between Cuyo and Cagayancillo Islands, the Philippine Atmospheric Geophysical Astronomical Services Administration (PAGASA) said in its 8 AM advisory.

As of 7 AM, the center of the eye of Typhoon Odette was located based on all available data at 155 km West Southwest of Iloilo City or 90 km South Southeast of Cuyo, Palawan with its maximum sustained winds of 155 km/h near the center, gustiness of up to 235 km/h, and a central pressure of 955 hPa.

The typhoon is moving westward at 25 km/h with strong winds or higher extending outwards up to 480 km from the center

Signal No.3 remains in the northern portion of Palawan (El Nido, Taytay, Araceli, Dumaran, Roxas, San Vicente, Puerto Princesa City) including Cagayancillo and Cuyo Islands in Luzon.

The same cyclone signal is still raised in Guimaras, the southern portion of Iloilo (Tigbauan, Leon, Tubungan, Guimbal, Igbaras, Miagao, San Joaquin), the southern portion of Antique (Patnongon, San Remigio, San Jose, Belison, Sibalom, Hamtic, Tobias Fornier, Anini-Y) in the Visayas.

TCWS No.2 remains hoisted in the southern portion of Oriental Mindoro (Bansud, Bulalacao, Roxas, Bongabong, Mansalay), the southern portion of Occidental Mindoro (Rizal, San Jose, Magsaysay, Calintaan, Sablayan), the western portion of Romblon (Looc, Ferrol, Santa Fe, San Jose, Alcantara, Santa Maria, Odiongan, San Agustin, San Andres, Calatrava), and the central portion of Palawan (Narra, Sofronio Española, Quezon, Aborlan, Rizal, Brooke’s Point) including Kalayaan and Calamian Islands in Luzon.

Signal No. 2 is also battering Aklan, Capiz, the rest of Iloilo, the rest of Antique, Guimaras, Negros Oriental, Negros Occidental, and the southern portion of Cebu (Toledo City, Pinamungahan, San Fernando, City of Carcar, Aloguinsan, Barili, Sibonga, Dumanjug, Argao, Ronda, Alcantara, Moalboal, Badian, Dalaguete, Alegria, Alcoy, Malabuyoc, Boljoon, Oslob, Ginatilan, Samboan, Santander) in the Visayas.

Meanwhile, Signal No. 1 is hoisted over the following areas:

Luzon

The western portion of Camarines Sur, Albay (Del Gallego, Ragay, Lupi, Sipocot, Libmanan, Cabusao, Calabanga, Bombon, Magarao, Canaman, Pamplona, Camaligan, Gainza, Pasacao, Naga City, Milaor, San Fernando, Pili, Ocampo, Sagñay, Buhi, Iriga City, Baao, Bula, Minalabac, Nabua, Balatan, Bato), Sorsogon, Masbate including Ticao and Burias Islands, Marinduque, the southern portion of Quezon (San Antonio, Tiaong, Candelaria, Sariaya, Dolores, Lucena City, Pagbilao, Padre Burgos, Atimonan, Agdangan, Unisan, Gumaca, Plaridel, Pitogo, Lopez, Guinayangan, Buenavista, Catanauan, General Luna, Macalelon, Mulanay, San Narciso, San Andres, San Francisco, Tagkawayan, Calauag, Quezon, Alabat, City of Tayabas, Perez), the rest of Occidental Mindoro including Lubang Islands, the rest of Oriental Mindoro, the rest of Palawan, the rest of Romblon, and Batangas.

Visayas

The western portion of Northern Samar (Lope de Vega, Catarman, Bobon, San Jose, Rosario, Lavezares, Biri, Allen, Victoria, San Isidro, San Antonio, Capul, San Vicente), the western portion of Samar (Calbayog City, Santa Margarita, Gandara, Pagsanghan, Tarangnan, San Jorge, City of Catbalogan, Zumarraga, Daram, Talalora, Villareal, Santa Rita, Santo Niño, Almagro, Tagapul-An), Bohol, Biliran, Leyte, the western portion of Southern Leyte (Sogod, Tomas Oppus, Bontoc, Malitbog, Padre Burgos, Macrohon, City of Maasin, Limasawa), the rest of Cebu including Bantayan and Camotes Islands, and Siquijor

Mindanao

The northern portion of Zamboanga del Norte (Baliguian, Gutalac, Kalawit, Labason, Liloy, Tampilisan, Salug, Godod, Bacungan, Sindangan, Siayan, Jose Dalman, Manukan, Pres. Manuel A. Roxas, Katipunan, Sergio Osmeña Sr., Dipolog City, Polanco, Piñan, Mutia, Dapitan City, La Libertad, Sibutad, Rizal), and the northern portion of Misamis Occidental (Don Victoriano Chiongbian, Aloran, Oroquieta City, Lopez Jaena, Concepcion, Sapang Dalaga, Calamba, Baliangao, Plaridel)

The state weather bureau said that Tropical Cyclone Wind Signals hoisted in areas that are no longer on the list are now lifted.

PAGASA added that heavy to torrential rains over Western Visayas, Palawan including Calamian, Cuyo, and Cagayancillo Islands, and Negros Oriental. Moderate to heavy with at times intense rains over the Bicol Region, Zamboanga Peninsula, Quezon, and the rest of MIMAROPA. Light to moderate with at times heavy rains over the Metro Manila, Cagayan Valley, Cordillera Administrative Region, Caraga, Northern Mindanao, Aurora, Lanao del Sur, and the rest of Visayas,

Under these conditions, scattered to widespread flooding (including flash floods) and rain-induced landslides are expected especially in areas that are highly or very highly susceptible to these hazards as identified in hazard maps, and in localities with significant antecedent rainfall.

PAGASA further warned that there is a moderate to high risk of storm surge of up to 3.0 m in height in the next 24 hours which may cause life-threatening flooding in the low-lying coastal areas of Negros Provinces, Iloilo, Antique, Guimaras, and several localities in the northern portion of Palawan (including Calamian, Cuyo and Cagayancillo Islands).

Odette intensifies further; Signal #4 up in 4 provinces

Maris Federez   •   December 16, 2021

MANILA, Philippines — Typhoon Odette intensifies further as it endangers the Bucas Grande-Siargao Islands and Dinagat Islands, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) reported in an 11 AM update Thursday, December 16.

PAGASA said the center of the eye of Typhoon Odette was located based on all available data including those from Hinatuan Doppler Weather Radar at 175 kilometers East of Surigao City, Surigao del Norte (9.7°N, 127.1°E).

It carries maximum sustained winds of 185 kilometers per hour (km/h) near the center, gustiness of up to 230 km/h, and a central pressure of 940 hPa, while moving West Northwestward at 25 km/h.

Strong winds or higher extend outwards up to 480 km from the center.

Tropical Cyclone Wind Signal (TCWS) No.4, with very destructive typhoon-force winds prevailing or expected within 12 hours, is hoisted over the following provinces:

Visayas

Southern Leyte, and the eastern portion Bohol (Talibon, Trinidad, San Miguel, Dagohoy, Pilar, Sierra Bullones, Jagna, Garcia Hernandez, Duero, Guindulman, Anda, Candijay, Alicia, Mabini, Ubay, Pres. Carlos P. Garcia, Bien Unido)

Mindanao

Dinagat Islands, Surigao del Norte including Siargao and Bucas Grande Islands

TCWS No.3, with destructive typhoon-force winds prevailing or expected within 18 hours, is up in:

Visayas

The southern portion of Leyte (Abuyog, Mahaplag, Hilongos, Bato, Matalom, Hindang, Inopacan, City of Baybay, Javier, Macarthur), the southern and central portions of Cebu (Camotes Islands, Tuburan, Catmon, Carmen, Danao City, Asturias, Balamban, Cebu City, Compostela, Liloan, Consolacion, Lapu-Lapu City, Mandaue City, Toledo City, City of Talisay, Minglanilla, Samboan, Sibonga, Alcoy, Ginatilan, Boljoon, City of Carcar, Malabuyoc, Moalboal, Cordova, Oslob, Aloguinsan, Pinamungahan, Barili, Santander, Badian, Dalaguete, Alcantara, Ronda, Alegria, City of Naga, Argao, San Fernando, Dumanjug, Sogod), the rest of Bohol, Negros Oriental, Siquijor, the southern and central portions of  Negros Occidental (Calatrava, San Carlos City, Salvador Benedicto, City of Talisay, Silay City, Bacolod City, Murcia, Bago City, Valladolid, Pulupandan, La Carlota City, San Enrique, La Castellana, Moises Padilla, Pontevedra, Hinigaran, Isabela, Binalbagan, City of Himamaylan, City of Kabankalan, Ilog, Cauayan, Candoni, City of Sipalay, Hinoba-An), and Guimaras

Mindanao

The northern portion of Agusan del Norte (Kitcharao, Jabonga, Santiago, Tubay, City of Cabadbaran), and the northern portion of Surigao del Sur (Carrascal, Cantilan, Madrid, Carmen, Lanuza, Cortes, City of Tandag)

Meanwhile, TCWS No.2, with damaging gale- to storm-force winds prevailing or expected within 24 hours, is raised over:

Luzon

The southern portion Albay (The city of Tabaco, Malilipot, Rapu-rapu, Bacacay, Santo Domingo, Legazpi City, Manito, Camalig, Daraga, Jovellar, Guinobatan, Pio Duran, City of Ligao, Oas), Sorsogon, Masbate including Ticao and Burias Islands, Romblon, the central and southern portions of Oriental Mindoro (Pinamalayan, Gloria, Bansud, Bongabong, Roxas, Mansalay, Bulalacao, Socorro, Pola), the central and southern portions of Occidental Mindoro (Sablayan, Calintaan, Rizal, San Jose, Magsaysay),and Palawan (El Nido, Calamian Islands, Taytay, Dumaran, Araceli, Cuyo Islands)

Visayas

Northern Samar, Eastern Samar, Samar, Biliran, the rest of Leyte, the rest of Cebu, the rest of Negros Occidental, Iloilo, Capiz, Aklan, and Antique

Mindanao

The rest of Surigao del Sur, Agusan del Sur,  the rest of Agusan del Norte, the extreme northern portion of Zamboanga del Norte (Dapitan City, Siayan, Sindangan, Jose Dalman, Manukan, Pres. Manuel A. Roxas, Katipunan, Sergio Osmeña Sr., Polanco, Dipolog City, Piñan, Mutia, La Libertad, Rizal, Sibutad), the extreme northern portion of Zamboanga del Sur (Josefina, Molave, Mahayag, Dumingag, Tambulig), Misamis Occidental, the northern portion of Lanao del Norte (Kolambugan, Maigo, Munai, Bacolod, Poona Piagapo, Kauswagan, Pantao Ragat, Matungao, Linamon, Baloi, Tagoloan, Pantar, Iligan City), Misamis Oriental, Camiguin, the northern portion of Bukidnon (Cabanglasan, City of Malaybalay, Lantapan, Talakag, Baungon, Libona, Manolo Fortich, Sumilao, Impasug-Ong, Malitbog), and the northern portion of Lanao del Sur (Tagoloan II, Kapai)

TCWS No.1 with strong winds prevailing or expected within 36 hours, on the other hand, is up in the following areas:

Luzon

Catanduanes, Camarines Norte, Camarines Sur, the rest of Albay, Marinduque, the southern portion of Quezon (San Antonio, Tiaong, Candelaria, Sariaya, Dolores, Lucena City, Pagbilao, Padre Burgos, Atimonan, Agdangan, Unisan, Gumaca, Plaridel, Pitogo, Lopez, Guinayangan, Buenavista, Catanauan, General Luna, Macalelon, Mulanay, San Narciso, San Andres, San Francisco, Tagkawayan, Calauag, Quezon, Alabat, City of Tayabas, Perez), Batangas, the rest of Oriental Mindoro, the rest of Occidental Mindoro, the rest of mainland Palawan including Balabac and Kalayaan Islands

Mindanao

The northern portion of Davao Oriental (Baganga, Cateel, Boston), the northern portion of Davao de Oro (Laak, Mawab, Nabunturan, Montevista, Monkayo, New Bataan, Compostela), the northern portion of Davao del Norte (Talaingod, Santo Tomas, Kapalong, Asuncion, San Isidro, New Corella), the rest of Bukidnon, the rest of Lanao del Norte, the rest of Lanao del Sur, the rest of northern portion of Zamboanga del Norte (Labason, Kalawit, Tampilisan, Liloy, Salug, Godod, Bacungan, Gutalac, Baliguian), the rest of northern portion of Zamboanga del Sur (Bayog, Lakewood, Kumalarang, Guipos, Dumalinao, Tukuran, Ramon Magsaysay, Aurora, Sominot, Tigbao, Labangan, Pagadian City, Midsalip,), and the northern portion of Zamboanga Sibugay (Titay, Ipil, Naga, Kabasalan, Siay, Diplahan, Buug)

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