Typhoon Glenda (Rammasun) sweeps through the Philippines

 by RN Eco, C Mongaya, J Alconis, BA Racoma

Glenda MTSAT VIS

Typhoon Glenda (Rammasun) as it approaches eastern Philippines. Image source: Project NOAH/ClimateX/PAGASA

Typhoon Glenda (international code: Rammasun) entered the Philippine Area of Responsibility (PAR) on 13 July 2014. It initially packed 85 kph gusts of wind, moving in a west-southwest direction before shifting its trajectory to west-northwest as it approached Laoang, Northern Samar. It continued on this course until reaching Cavite on 16 July, making a sharp turn northwestward towards Bataan and passing through southern Metro Manila. It continued on this track until exiting the PAR on 17 July.

Glenda Doppler

Visualization of Typhoon Glenda from Virac doppler radar, as it passes through the provinces of Northern Samar, Camarines Sur, Camarines Norte, and Albay on July 15, 2014. Image source: ClimateX/PAGASA

glenda_07-15_07-16

Hourly rainfall contour from data measured by Project NOAH rain gauges from July 15-16. Red areas experienced torrential rainfall (>30 mm/hr), yellow intense rainfall (15-30 mm/hr), dark blue heavy rainfall (7.5-15 mm/hr), blue moderate rainfall (2.5 -7.5 mm/hr), and cyan light to none (0-2.5 mm/hr)

In general, the concentration of intense to torrential rainfall followed the track of the typhoon as depicted in the animation above, starting from the island of Samar and northern Leyte on July 15 progressing to southeastern Luzon island then southern Luzon by the afternoon of July 16. Large areas in Panay, Marinduque, Catanduanes, and Palawan islands also recorded significant rainfall during the period.

rammasun_rain_9-16_july_2014_0

Typhoon Glenda accumulated rainfall in the Philippines as measured by TRMM from July 9-16. Image source: SSAI/NASA, Hal Pierce

A rainfall analysis from July 9-16 made by NASA using the Tropical Rainfall Measuring Mission or TRMM-calibrated merged with global Multi-satellite Precipitation Analysis (TMPA) measured a total of 325 mm (about 12.8 inches) rainfall in central Philippines as Typhoon Glenda passed through.

Consequently, the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) issued severe weather bulletins and storm surge warnings in several provinces. This was complemented by storm surge height forecast by released by Project NOAH detailing the locations with significant rise in water levels.

Still reeling from the devastation brought by Supertyphoon Yolanda (international code: Haiyan), local authorities evacuated more than 518,000 people to 1,264 evacuation centers throughout the affected areas. Local authorities were more prepared this time, most notably the Albay province which reported zero casualties. Nonetheless, in other areas the National Disaster Risk Reduction and Management Council (NDRRMC) as of July 21 reported 97 casualties, mostly caused by flying debris or collapsed structures, 460 injured, and 6 still missing. It also caused more than PhP 7.45 billion worth of damages to infrastructure and agriculture. NDRRMC also reported 118,281 houses were damaged by the strong winds brought by the typhoon. Several local government units have declared a state of calamity, namely:

  • Albay
  • Camarines Sur
  • Naga City
  • Northern Samar
  • Rizal
  • Obando, Bulacan
  • Laguna
Glenda MTSAT

Satellite image of Typhoon Glenda as it exits the Philippine Area of Responsibility (PAR). Image source: Project NOAH/ClimateX/PAGASA

 

Glenda has strengthened to a supertyphoon and advanced through southern China on 18 July 2014, causing  17 fatalities on the island of Hainan and in the Guanxie region.

References 

BBC (2014). Typhoon Rammasun: Monster storm buffets south China.
Retrieved 21 July 2014 http://www.bbc.com/news/world-asia-28390279

CNN (2014). Supertyphoon Rammasun bears down on southern China.
Retrieved 19 July 2014 http://edition.cnn.com/2014/07/17/world/asia/typhoon-rammasun-china-landfall/index.html.

Inquirer (2014). Albay model: Zero causalty. http://newsinfo.inquirer.net/620961/albay-model-zero-casualty.
Retrieved 19 July 2014

NDRRMC (2014). Updates on Typhoon “GLENDA” (RAMMASUN) (As of 21 July 2014, 4:00 PM). http://ndrrmc.gov.ph/attachments/article/1234/Updates%20SitRep%20no19%20effects%20TY%20GLENDA.pdf. Retrieved 22 July 2014

PAGASA (2014). SEVERE WEATHER BULLETIN NUMBER ONE. Issued at 7:00 p.m., Sunday, 13 July 2014.
Retrieved 21 July 2014
http://www.pagasa.dost.gov.ph/tropical-cyclone/weather-bulletin-update/139-tropical-cyclone/glenda-2014-bulletin/1044-1

Project NOAH (2014). List of Municipalities: Typhoon Glenda (Rammasun) Storm Surge Forecast Model as of 15 July 2014. http://blog.noah.dost.gov.ph/2014/07/15/list-of-municipalities-typhoon-glenda-rammasun-storm-surge-forecast-model-as-of-15-july-2014/.
Retrieved 19 July 2014.

 

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