Brief communication &amp;quot;Using the new Philippine radar network to reconstruct the &amp;lt;i&amp;gt;Habagat of August 2012&amp;lt;/i&amp;gt; monsoon event around Metropolitan Manila&amp;quot;

Heistermann, Maik; Crisologo, Irene; Abon, C. C.; Racoma, Bernard Alan B.; Jacobi, Stephan; Servando, Nathaniel T.; David, Clarissa C.; Bronstert, Axel

doi:10.5194/nhess-13-653-2013

Cited by 25 publications

(17 citation statements)

References 5 publications

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“…NOAH includes the deployment of new monitoring equipment (e.g. over 1000 new rain gauges over the entire country), active research, and the development of forecasting technologies (Heistermann et al 2013a), as well as the public dissemination of real-time hydro-meteorological information in the Internet (http://noah.dost.gov.ph). Complementary to NOAH, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) recently installed, from scratch, a weather radar network in which the first station went operational in 2011.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the potential of radar-based rainfall estimates for streamflow and flood simulations in the Philippines

Abon

Kneis

Crisologo

et al. 2015

Geomatics, Natural Hazards and Risk

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This case study evaluates the suitability of radar-based quantitative precipitation estimates (QPEs) for the simulation of streamflow in the Marikina River Basin (MRB), the Philippines. Hourly radar-based QPEs were produced from reflectivity that had been observed by an S-band radar located about 90 km from the MRB. Radar data processing and precipitation estimation were carried out using the open source library wradlib. To assess the added value of the radarbased QPE, we used spatially interpolated rain gauge observations (gauge-only (GO) product) as a benchmark. Rain gauge observations were also used to quantify rainfall estimation errors at the point scale. At the point scale, the radarbased QPE outperformed the GO product in 2012, while for 2013, the performance was similar. For both periods, estimation errors substantially increased from daily to the hourly accumulation intervals. Despite this fact, both rainfall estimation methods allowed for a good representation of observed streamflow when used to force a hydrological simulation model of the MRB. Furthermore, the results of the hydrological simulation were consistent with rainfall verification at the point scale: the radar-based QPE performed better than the GO product in 2012, and equivalently in 2013. Altogether, we could demonstrate that, in terms of streamflow simulation, the radar-based QPE can perform as good as or even better than the GO product À even for a basin such as the MRB which has a comparatively dense rain gauge network. This suggests good prospects for using radar-based QPE to simulate and forecast streamflow in other parts of the Philippines where rain gauge networks are not as dense.

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Section: Introductionmentioning

confidence: 99%

Evaluating the potential of radar-based rainfall estimates for streamflow and flood simulations in the Philippines

Abon

Kneis

Crisologo

et al. 2015

Geomatics, Natural Hazards and Risk

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“…The higher than normal rainfall from TS Ketsana was hypothesized to have been due to the interaction of the TC and the Sierra Madre mountain range where the westerly wind along the TC's southern hemisphere induced orographic precipitation across the Marikina river basin (Abon et al ., ; Racoma et al ., ). TS Ketsana brought about changes in the development of early warning systems in the Philippines, particularly the installation of two radars (Subic S‐band and Tagaytay C‐band radar stations) covering Metro Manila (Heistermann et al ., ).…”

Section: Resultsmentioning

confidence: 97%

118‐year climate and extreme weather events of Metropolitan Manila in the Philippines

Bagtasa

2019

Intl Journal of Climatology

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Metropolitan Manila, the Philippines, is a megacity with a population of 12.9 million people. Unabated urbanization and disorganized infrastructure build‐up, coupled with a large urban poor population have made many of its population vulnerable to climate change. This study presents the 118‐year urban climate and extreme weather events of Metropolitan Manila. Daily average and minimum temperature are on the rise comparable to countrywide trends. Consequently, there are more warm and less cold nights. Total annual precipitation is also increasing at a rate of 77.99 mm/decade. Decreasing simple daily intensity index implies that higher observed precipitation is due to the increase in wet days count rather than intensity. Tropical cyclones (TCs) are critical in producing most extreme rainfall events in the metropolis. Extreme precipitation is induced either by a TC's immediate rainbands or remote precipitation effects by enhancing the prevailing summer monsoon flow. TC‐induced rain modulates annual rainfall variability and is estimated to contribute 45.2% to Metropolitan Manila mean total rainfall.

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“…Hovering over the Pacific Ocean, Typhoon Haikui of 2012 enhanced the South West Monsoon by pulling in moist air toward the land (Heistermann et al, 2013). A similar scenario, with a tropical storm located northeast of the Philippines was also present during the 2013 Habagat, with Tropical Storm Trami (local codename Maring) enhancing the monsoon.…”

Section: Methodsmentioning

confidence: 94%

Volcanoes magnify Metro Manila's southwest monsoon rains and lethal floods

et al. 2015

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Many volcanoes worldwide are located near populated cities that experience monsoon seasons, characterized by shifting winds each year. Because of the severity of flood impact to large populations, it is worthy of investigation in the Philippines and elsewhere to better understand the phenomenon for possible hazard mitigating solutions, if any. During the monsoon season, the change in flow direction of winds brings moist warm air to cross the mountains and volcanoes in western Philippines and cause lift into the atmosphere, which normally leads to heavy rains and floods. Heavy southwest monsoon rains from 18-21 August 2013 flooded Metro Manila (population of 12 million) and its suburbs paralyzing the nation's capital for an entire week. Called the 2013 Habagat event, it was a repeat of the 2012 Habagat or extreme southwest monsoon weather from 6-9 August, which delivered record rains in the mega city. In both the 2012 and 2013 Habagat events, cyclones, the usual suspects for the delivery of heavy rains, were passing northeast of the Philippine archipelago, respectively, and enhanced the southwest monsoon. Analysis of Doppler data, rainfall measurements, and Weather Research and Forecasting (WRF) model simulations show that two large stratovolcanoes, Natib and Mariveles, across from Manila Bay and approximately 70 km west of Metro Manila, played a substantial role in delivering extreme rains and consequent floods to Metro Manila. The study highlights how volcanoes, with their shape and height create an orographic effect and dispersive tail of rain clouds which constitutes a significant flood hazard to large communities like Metro Manila.

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Brief communication "Using the new Philippine radar network to reconstruct the <i>Habagat of August 2012</i> monsoon event around Metropolitan Manila"

Cited by 25 publications

References 5 publications

Evaluating the potential of radar-based rainfall estimates for streamflow and flood simulations in the Philippines

Evaluating the potential of radar-based rainfall estimates for streamflow and flood simulations in the Philippines

118‐year climate and extreme weather events of Metropolitan Manila in the Philippines

Volcanoes magnify Metro Manila's southwest monsoon rains and lethal floods

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