Typhoon Pedring
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Typhoon Nesat, known in the Philippines as Typhoon Pedring, was the most powerful
tropical cyclone A tropical cyclone is a rapidly rotating storm system with a low-pressure area, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depending on its locat ...
to directly impact China since 2008. It also struck the Philippines during late-September 2011, killing 98 people. It is the 17th named storm, the 11th severe tropical storm, the 7th
typhoon A typhoon is a tropical cyclone that develops between 180° and 100°E in the Northern Hemisphere and which produces sustained hurricane-force winds of at least . This region is referred to as the Northwestern Pacific Basin, accounting for a ...
and overall, the 30th tropical cyclone to be monitored by the
Japan Meteorological Agency The Japan Meteorological Agency (JMA; ''気象庁, Kishō-chō'') is a division of the Ministry of Land, Infrastructure, Transport and Tourism dedicated to the Scientific, scientific observation and research of natural phenomena. Headquartered ...
(JMA) during the year. Nesat came exactly two years after
Typhoon Ketsana Typhoon Ketsana, known in the Philippines as Tropical Storm Ondoy, was the second-most devastating tropical cyclone of the 2009 Pacific typhoon season, causing United States dollar, $1.15 billion in damages and 665 fatalities, only behind Typho ...
made landfall in the Philippines as the most devastating
typhoon A typhoon is a tropical cyclone that develops between 180° and 100°E in the Northern Hemisphere and which produces sustained hurricane-force winds of at least . This region is referred to as the Northwestern Pacific Basin, accounting for a ...
in the
2009 Pacific typhoon season The 2009 Pacific typhoon season was a below average season that spawned only 22 named storms, 13 typhoons, and five super typhoons. Despite this, it was a very deadly season, with the Philippines having experienced its deadliest season in decad ...
with a damage of 1.09 billion and 747 fatalities. Nesat was also the first of twin tropical cyclones to batter the Philippines within one week during September 2011, the second was Nalgae. The low pressure area that was to become Nesat developed on the evening of September 21, to the east-southeast of
Palau Palau, officially the Republic of Palau, is an island country in the Micronesia subregion of Oceania in the western Pacific Ocean. The Republic of Palau consists of approximately 340 islands and is the western part of the Caroline Islands ...
. The
Joint Typhoon Warning Center The Joint Typhoon Warning Center (JTWC) is a joint United States Navy – United States Air Force command in Pearl Harbor, Hawaii. The JTWC is responsible for the issuing of tropical cyclone warnings in the North-West Pacific Ocean, South P ...
(JTWC) originally anticipated Nesat would become a Category 4 super typhoon on the Saffir–Simpson Hurricane Scale (SSHS) with winds exceeding (1-min sustained). However, because of a cold anomaly, the system only reached a maximum 1-min sustained wind speed of making it a powerful Category 4 typhoon. Nesat made landfall over the Luzon region of the Philippines and the maximum sustained winds dropped to . The system continued to weaken with convective banding loosely wrapped into the partially exposed
low-level circulation center The eye is a region of mostly calm weather at the center of a tropical cyclone. The eye of a storm is a roughly circular area, typically in diameter. It is surrounded by the eyewall, a ring of towering thunderstorms where the most severe weath ...
(LLCC). The winds continued to drop and eventually reached (1-min sustained) which made it a minimal typhoon on the SSHS. On September 29, by the time Nesat managed to re-develop a ragged eye, it made landfall over Wenchang in Hainan, China and started weakening again. Due to the rapid weakening, the JTWC ceased advisories on the storm, soon afterwards. Later that evening, the JMA downgraded Nesat to a tropical low over land and issued their final warning on the system. As Nesat neared the Philippines, the local government ordered the evacuation of residents living in low-lying areas, cancelled flights and suspended classes on all levels. Several provinces were placed under Signal Number 2 and 1. China's flood control authority activated their emergency response system so that they can cope up with the upcoming typhoons Nesat, and Nalgae. The authority requested local governments in relevant areas to closely monitor both the typhoons and keep the public aware of what is happening. They initiated a level IV typhoon response program and sent two working teams to the provinces of Guangdong and Hainan so that they can assist people in all the preparations that they have to make. Ships were recalled, flight and ferry services were suspended and schools were shut as the strongest typhoon to directly impact Hainan in 2011 was approaching its final landfall. Macao's public transportation system was also suspended after typhoon signal No. 8 was hoisted by most local meteorological authorities. In Hong Kong, many functions and activities were canceled or postponed because of the fast approaching storm. Early on September 27, Typhoon Nesat struck the Philippines with a maximum 1-min sustained wind speed of and killed four people after pinning them under a collapsed wall in
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. The residents of Manila had no other choice but to wade through waist-deep floodwaters, dodging branches and flying
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as the typhoon sent surging waves as tall as palm trees over seawalls, completely submerging neighborhoods. The typhoon made landfall before dawn triggering instant response. Officials in Albay province said that "About 112,000 people were ordered to leave their homes in five towns prone to flashfloods and
landslides Landslides, also known as landslips, rockslips or rockslides, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, mudflows, shallow or deep-seated slope failures and debris flows. Landslide ...
in central Albay province. Among the hardest hit provinces were Isabela and Aurora where most of the population was directly dependent on agriculture. Very similar to what happened after Typhoon Ketsana, a state of calamity was declared in Luzon in order to undertake an emergency procedure in order to ensure safe and timely water releases from the dams. Nesat approached China just one day after the preparations for it started. Because of the low strength of the storm, the damages from Nesat to China were expected to be near US$50 million. The typhoon then hit Vietnam and weakened into a tropical storm.


Meteorological history

During September 21, the
Joint Typhoon Warning Center The Joint Typhoon Warning Center (JTWC) is a joint United States Navy – United States Air Force command in Pearl Harbor, Hawaii. The JTWC is responsible for the issuing of tropical cyclone warnings in the North-West Pacific Ocean, South P ...
(JTWC) reported that a tropical disturbance had developed at the eastern end of a monsoon trough, about to the southeast of Melekeok on the island of Palau. The disturbance had a well defined low level circulation centre with convection flaring around it and was located in a region of moderate vertical windshear. Over the next 24 hours the depression moved towards the northeast, while gradually developing further. The
Japan Meteorological Agency The Japan Meteorological Agency (JMA; ''気象庁, Kishō-chō'') is a division of the Ministry of Land, Infrastructure, Transport and Tourism dedicated to the Scientific, scientific observation and research of natural phenomena. Headquartered ...
and the JTWC then reported during September 23 that the disturbance had developed into a tropical depression, with the latter designating it as Tropical Depression 20W. Early on September 24, the JMA further upgraded 20W to a tropical storm and named it Nesat. Nesat continued to drift west with expanding deep convection around the entire system and consolidating convection around the LLCC. The mid-level warm anomaly near the system continued to intensify and convective banding near the LLCC became more and more tighter. As a result, the JMA upgraded Nesat to a severe tropical storm on September 25. Nesat was originally expected to have undergone rapid intensification until September 25, but the JTWC later reported that the
sea surface temperature Sea surface temperature (or ocean surface temperature) is the ocean temperature, temperature of ocean water close to the surface. The exact meaning of ''surface'' varies in the literature and in practice. It is usually between and below the sea ...
s was a little less than expected and Nesat could not strengthen rapidly. However, Nesat was still strengthening. With an extremely well developed equatoward outflow, Nesat already had a windspeed of (1-min sustained). Late on September 25, the JMA further upgraded Nesat to a typhoon. On September 26, an image from
Advanced Microwave Sounding Unit The advanced microwave sounding unit (AMSU) is a multi-channel microwave radiometer installed on meteorological satellites. The instrument examines several bands of microwave radiation from the atmosphere to perform atmospheric sounding of tempe ...
(AMSU), a multi-channel microwave
radiometer A radiometer or roentgenometer is a device for measuring the radiant flux (power) of electromagnetic radiation. Generally, a radiometer is an infrared radiation detector or an ultraviolet detector. Microwave radiometers operate in the micro ...
installed on meteorological satellites depicted that Nesat developed an
eye An eye is a sensory organ that allows an organism to perceive visual information. It detects light and converts it into electro-chemical impulses in neurons (neurones). It is part of an organism's visual system. In higher organisms, the ey ...
like feature approximately east-northeast of
Manila, Philippines Manila, officially the City of Manila, is the capital and second-most populous city of the Philippines after Quezon City, with a population of 1,846,513 people in 2020. Located on the eastern shore of Manila Bay on the island of Luzon, it is ...
. At that time, it had a 1-min sustained wind speed of with deep convection primarily over the western semicircle of the system. The system rapidly deepened and quickly developed a ragged eye and mesoscale
anticyclone A high-pressure area, high, or anticyclone, is an area near the surface of a planet where the atmospheric pressure is greater than the pressure in the surrounding regions. Highs are middle-scale meteorological features that result from interpl ...
aloft generating an exceptionally excellent all-around outflow. Also, the system had a highly
symmetric Symmetry () in everyday life refers to a sense of harmonious and beautiful proportion and balance. In mathematics, the term has a more precise definition and is usually used to refer to an object that is invariant under some transformations ...
radial
outflow Outflow may refer to: *Capital outflow, the capital leaving a particular economy *Bipolar outflow, in astronomy, two continuous flows of gas from the poles of a star * Outflow (hydrology), the discharge of a lake or other reservoir system *Outflow ...
. The JTWC Originally anticipated Nesat to become a Category 5 super typhoon on the SSHS with winds exceeding (1-min sustained). However, because of a cold anomaly, the system only reached a maximum 1-min sustained wind speed of making it a minimum Category 4 typhoon. Early on September 27, Nesat made landfall over the Luzon region of Philippines. As a result, the
eyewall The eye is a region of mostly calm weather at the center of a tropical cyclone. The eye of a storm is a roughly circular area, typically in diameter. It is surrounded by the eyewall, a ring of towering thunderstorms where the most severe weath ...
got eroded and the maximum 1-min sustained winds dropped to . The system approached land at nearly . However, later on that day, the LLCC started to get re-consolidated with convection as Nesat quickly moved west and re-emerged over water. At that time, it was located near the southern periphery of a deep layered subtropical steering ridge and moved towards the southwest and the winds further dropped to because of land interaction. Though the system has maintained overall central deep convection,
subsidence Subsidence is a general term for downward vertical movement of the Earth's surface, which can be caused by both natural processes and human activities. Subsidence involves little or no horizontal movement, which distinguishes it from slope mov ...
persisted along the northwest quadrant which caused further drop in wind speed. Upper level analysis indicated that Nesat was to the south of a ridge axis in an area of moderate vertical
wind shear Wind shear (; also written windshear), sometimes referred to as wind gradient, is a difference in wind speed and/or direction over a relatively short distance in the atmosphere. Atmospheric wind shear is normally described as either vertical ...
. The system continued to weaken with convective banding loosely wrapped into the partially exposed LLCC. The winds continued to drop and eventually reached (1-min sustained) which made it a minimal typhoon on the SSHS. Though the weakening, Water vapour imagery showed that the typhoon was still maintaining excellent outflow towards the equator and improving outflow towards the pole. Nesat maintained a relatively large area of gale-force winds. Animated infrared satellite imagery depicted that the storm was expanding in size and convective banding continued to move further and further away from the LLCC. The LLCC was also relatively large, elongated and cloud free. On September 29, by the time Nesat managed to re-develop a ragged eye, it made landfall over
Wenchang Wenchang ( postal: Mencheong; ; Hainanese spellings: Boon Siou) is a county-level city in the northeast of Hainan Island in China. Covering an area of , the city has a coastline of , and is divided into 17 towns. The city is a major target for t ...
in
Hainan Hainan is an island provinces of China, province and the southernmost province of China. It consists of the eponymous Hainan Island and various smaller islands in the South China Sea under the province's administration. The name literally mean ...
, China and started weakening again. Because of the poor shape and disorganization at the LLCC, the typhoon could only maintain a maximum 1-min sustained windspeed of . Even after the landfall, Nesat maintained vigorous convection all around the LLCC and did not weaken too much when compared to the reactions after the Philippine
landfall Landfall is the event of a storm moving over land after being over water. More broadly, and in relation to human travel, it refers to 'the first land that is reached or seen at the end of a journey across the sea or through the air, or the fact ...
. There was a sea-surface temperature of approximately and a slight vertical wind shear of near the system's center at that time. The JTWC anticipated the storm to gradually drift over the
Gulf of Tonkin The Gulf of Tonkin is a gulf at the northwestern portion of the South China Sea, located off the coasts of Tonkin ( northern Vietnam) and South China. It has a total surface area of . It is defined in the west and northwest by the northern co ...
and make landfall over Vietnam with a 1-min sustained wind speed of at least . Early on September 30, Nesat made its final landfall over northern Vietnam with a 1-mim sustained windspeed of and a well-defined, tightly wrapped LLCC, and soon it started weakening. Due to land interaction, the convection around the system started decaying rapidly. Due to the rapid weakening, the JTWC ceased advisories on the storm, soon afterwards. Later that evening, the JMA downgraded Nesat to a tropical low over land and issued their final warning on the system.


Preparations and impact


Philippines

As Nesat neared the
Philippines The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ...
, the Philippine government ordered the evacuation of residents living in low-lying areas, cancelled flights and suspended classes on all levels. By the morning of September 26, some 111,000 people in the flood-prone areas of the
Albay Province Albay (IPA: ), officially the Province of Albay (; ; ᜎᜎᜏᜒᜄᜈ᜔ ᜈᜅ᜔ ᜀᜎ᜔ᜊᜌ᜔), is a province in the Bicol Region of the Philippines, mostly on the southeastern part of the island of Luzon. Its capital (and largest c ...
were ordered to leave their homes. Nearly 63 flights were either delayed or cancelled due to the storm. The provinces of Albay, Catanduanes and the Camarines were placed under storm warning Signal Number 2 while the provinces of Metro Manila, Masbate, Marinduque, Batangas, Cavite, Bulacan, Pampanga and most of the Northern Luzon provinces were placed under storm warning Signal Number 1. Even though Manila was placed in Storm Signal 2 (which suspends Pre-school, Elementary, and High school levels only), many universities, like the
University of the Philippines Diliman The University of the Philippines Diliman (also called UPD; ), also referred to as UP Diliman, is a State university and college (Philippines), public, coeducational, Research university, research university located in Diliman, Quezon City, Ph ...
&
Manila Manila, officially the City of Manila, is the Capital of the Philippines, capital and second-most populous city of the Philippines after Quezon City, with a population of 1,846,513 people in 2020. Located on the eastern shore of Manila Bay on ...
and Polytechnic University of the Philippines, Main Campus, suspended classes. Early on September 27, Typhoon Nesat struck the Philippines with a maximum 1-min sustained wind speed of and killed four people after pinning them under a collapsed wall in
Valenzuela Valenzuela may refer to: Places * Valenzuela, Paraguay * Valenzuela, Metro Manila, Philippines * Valenzuela, Spain * Valenzuela de Calatrava, Spain * Valenzuela, Louisiana Other uses * Valenzuela (surname), including a list of people with the ...
. The typhoon pounded the
Luzon Luzon ( , ) is the largest and most populous List of islands in the Philippines, island in the Philippines. Located in the northern portion of the List of islands of the Philippines, Philippine archipelago, it is the economic and political ce ...
region of the Philippines triggering flash floods, cutting power and halting daily activity in the capital Manila. The
Philippine Stock Exchange The Philippine Stock Exchange, Inc. (; ) is the national stock exchange of the Philippines. The exchange was created in 1992 from the merger of the Manila Stock Exchange and the Makati Stock Exchange. Including previous forms, the exchange has ...
and US embassy were forced to close due to the strong winds and heavy rains. The residents of Manila had no other choice but to wade through waist-deep floodwaters, dodging branches and flying debris as the typhoon sent surging waves as tall as palm trees over seawalls completely submerging neighborhoods. By the evening of September 27, at least 7 people were reported to be killed and most of them in metropolitan Manila, a place already battered by heavy
monsoon A monsoon () is traditionally a seasonal reversing wind accompanied by corresponding changes in precipitation but is now used to describe seasonal changes in Atmosphere of Earth, atmospheric circulation and precipitation associated with annu ...
al rains. A motorcyclist in the city reported that "It's flooded everywhere. We don’t have a place to go for shelter. Even my motorcycle got filled with water". He was one of the thousands stranded by fast-rising flood in the city. Similar to
Tulane University The Tulane University of Louisiana (commonly referred to as Tulane University) is a private research university in New Orleans, Louisiana, United States. Founded as the Medical College of Louisiana in 1834 by a cohort of medical doctors, it b ...
during
Hurricane Katrina Hurricane Katrina was a powerful, devastating and historic tropical cyclone that caused 1,392 fatalities and damages estimated at $125 billion in late August 2005, particularly in the city of New Orleans and its surrounding area. ...
, the
Ospital ng Maynila Medical Center The Ospital ng Maynila Medical Center (Hospital of Manila; abbreviation: OMMC) is a 300-bed non-profit tertiary, general and training hospital in Malate, Manila, Philippines. It is the laboratory hospital of health science students (students of ...
moved patients from its ground floor which was flooded with neck-deep waters. Hospital generators were flooded and the building had no power once the typhoon arrived. Soldiers and police in trucks moved thousands of residents, most importantly the women and the children away from the Baseco shanty town after many houses were washed away in the
storm surge A storm surge, storm flood, tidal surge, or storm tide is a coastal flood or tsunami-like phenomenon of rising water commonly associated with low-pressure weather systems, such as cyclones. It is measured as the rise in water level above the ...
and floodwaters brought by Nesat. The typhoon made landfall before dawn triggering instant response. Nearly thirty-seven percent of
Manila Electric Company The Manila Electric Company, also known as Meralco (, , stylized in uppercase), is an electric power distribution company in the Philippines. It is Metro Manila's only electric power distributor and holds the power distribution franchise for 3 ...
's service area was left without power after high winds and heavy rains toppled power lines. A company spokeswoman reported that "About 1.9 million customers of the nation's biggest power retailer are still without electricity. That's about 39 percent of its 4.9 million customers, compared with 44 percent who were without power at midday." Also, in
Malabon Malabon, officially the City of Malabon (), is a highly urbanized city in the National Capital Region of the Philippines. According to the 2020 census, it has a population of 380,522 people. Located just north of the city of Manila, Malabon is ...
,
Navotas Navotas, officially the City of Navotas (), is a Cities of the Philippines#Legal classification, highly urbanized city in the Metro Manila, National Capital Region of the Philippines. According to the 2020 Philippine census, 2020 census, it ha ...
and Valenzuela the Manila Electric power company shut down power to prevent any accidents. Dina Lomotan, the company spokesman said that "Manila Electric will try to restore power as conditions permit, prioritizing areas not directly affected by the storm." President
Benigno Aquino III Benigno Simeon Aquino III (; born Benigno Simeon Cojuangco Aquino III; February 8, 1960 – June 24, 2021), also known as Noynoy Aquino and colloquially as PNoy, was a Filipino politician who served as the 15th president of the Philippines ...
said "I have been in touch with Secretaries Soliman, Gazmin, and Almendras. I have instructed the Executive Secretary to compile information from National Disaster Risk Reduction and Management Council and to inform our people of conditions as well as of government efforts to mitigate the effects of the storm." He also said "I am in constant touch with the members of my cabinet and the Executive Secretary has been instructed to keep me and the public informed of conditions pertaining as well as mitigation efforts". On September 28, the death toll from Nesat was put at 18 and the number of missing at 35 after the day-long rain and winds. The
National Disaster Risk Reduction and Management Council The National Disaster Risk Reduction and Management Council (NDRRMC), formerly known as the National Disaster Coordinating Council (NDCC) until August 2011, is a working group of various government, non-government, civil sector and private sect ...
chief Benito Ramos said "We are focusing on trying to get power and telecommunications services today, and work crews have also fanned out to repair and clear 61 road networks across Luzon damaged by landslides, debris and floods". The extremely high storm surges brought by Nesat crashed over seawalls, flooding a hospital, a five-star hotel and the US embassy near Manila. As more power lines were downed, nearly a million people in Luzon and some areas in the capital Manila remained without power for the rest of September 27 and 28. Among the hardest hit provinces were
Isabela Isabela may refer to: People with the given name * Isabela Boscov, Brazilian film critic * Isabela Corona (1913–1993), Mexican actress * Isabela Garcia (born 1967), Brazilian actress * Isabela Moraes (born 1980), Brazilian synchronized swimmer ...
and
Aurora An aurora ( aurorae or auroras), also commonly known as the northern lights (aurora borealis) or southern lights (aurora australis), is a natural light display in Earth's sky, predominantly observed in high-latitude regions (around the Arc ...
where most of the population was directly dependent on Agriculture. Out of the total known deaths, most of them were reported to have occurred in and around metropolitan Manila. Santiago Austria, the
mayor In many countries, a mayor is the highest-ranking official in a Municipal corporation, municipal government such as that of a city or a town. Worldwide, there is a wide variance in local laws and customs regarding the powers and responsibilitie ...
of
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, a 1st class
municipality A municipality is usually a single administrative division having municipal corporation, corporate status and powers of self-government or jurisdiction as granted by national and regional laws to which it is subordinate. The term ''municipality' ...
in the province of
Nueva Ecija Nueva Ecija, officially the Province of Nueva Ecija ( ; ; ; ), is a landlocked province in the Philippines located in the Central Luzon region. Its capital is the city of Palayan, while Cabanatuan, its former capital, is the largest Local gove ...
said "We only have four boats but there are so many people waiting to be rescued. Many people here are still on top of their houses. We don't have enough boats to reach them and hand them food." The strong winds that blew through Manila toppled about 40 huge trees around the coastline from where thousands of people were moved from shantytowns into three different school buildings. The number of passengers stranded after Nesat's approach was as high as 4,476 in various ports 28 vessels and 20 motorized bancas were stopped at several ports in Luzon. A spokesman from the
Philippine Coast Guard The Philippine Coast Guard (PCG; ) is the third armed uniformed service of the country attached to the Philippines' Department of Transportation, tasked primarily with enforcing laws within Philippine waters, conducting maritime security ope ...
said that the bulk of stranded persons were stuck in ports in Manila, with 3,672; Lucena, 280; and Batangas, 140. By the night of September 28, Nesat's death toll eventually rose to 31. At that time, the first figures of the total estimated damage to agriculture and infrastructure started coming up and was put at 1 billion pesos (22.8 million U.S. dollars). The Philippine Department of Health, which is the
executive department The executive branch is the part of government which executes or enforces the law. Function The scope of executive power varies greatly depending on the political context in which it emerges, and it can change over time in a given country. In ...
of the Philippine Government responsible for ensuring access to basic
public health Public health is "the science and art of preventing disease, prolonging life and promoting health through the organized efforts and informed choices of society, organizations, public and private, communities and individuals". Analyzing the de ...
services to all Filipinos prepared medical supplies including 2.9 million pesos (66,360 U.S. dollars) worth of food and emergency supplies so that they can be distributed among the victims when the flood water recedes.


State of calamity

The Department of Social Welfare and Development (DSWD) and Philippine National Police (PNP) instantly responded to the state of emergency. The DSWD provided a total of 1.5-million Philippine Peso worth of relief goods and the PNP dispatched personnel and medical teams in order to assist the victims. The National Electrification Administration administrator Edita Bueno said that "More than 900,000 out of 1.2 million consumers were still cut off from the grid, but repairs are ongoing and electric cooperatives would have to wait for the grid's complete restoration before they could bring back electricity."


NDRRMC Situation reports

Early on September 29, the
National Disaster Risk Reduction and Management Council The National Disaster Risk Reduction and Management Council (NDRRMC), formerly known as the National Disaster Coordinating Council (NDCC) until August 2011, is a working group of various government, non-government, civil sector and private sect ...
(NDRRMC) issued a Situation report on the typhoon mentioning that at least 35 people were killed while 34 were injured and 45 still remained missing. They also added that the total amount of damage to agriculture and infrastructure was put at US$26,208,476. They mentioned that a total of 83 emergency incidents were monitored in various regions that were directly hit by the typhoon. In the hardest hit provinces, at least 25 folding beds; 18 tents; 40 boxes of blankets; 125 pieces of plastic mat; 200 pieces of water jugs; 125 pieces of mosquito nets; 5 pieces of protective suits; 5 pairs of goggles; 5 pieces of oil resistant boots, 5 pieces of rain coats; 10 pieces of gloves; 5 pieces of helmets; and 10 pieces of T-shirts were provided to the victims. Following the daily pattern of Situation reports, the NDRRMC issued another report on September 30, pushing up the number of dead to 43, the number of injured to 44 while pulling down the number of missing to 30. They reported that the total number of people affected were 986,417 in about 205,885 families. They also announced that there was a drastic increase in the total amount of damage from Nesat to both agriculture and infrastructure. They said that the total damage was at US$91,356,378 out of which US$78,893,835 was to agriculture alone. According to the report, the storm completely destroyed a total of 3,394 houses while 12,901 were badly damaged. Again on October 1, the NDRRMC reported the number of dead was as high as 50, the number of injured was 61 and the number of missing was 31. They further increased the total damage from Nesat to both agriculture and infrastructure to around US$136,957,559 where nearly US$123,951,792 was to agriculture alone. They said that a total of 60 bridge/road sections were reported impassable during the storm. The reports also indicated that all the transmission lines affected by the typhoon were put back to normal and power was restored completely. The NDRRMC further added that the Philippine National Police deployed a total of 87 deployed personnel in Hermosa, Bataan, Tarlac, Bulacan, and Pampanga; a total of 579 personnel deployed to help in the evacuation and rescue operations in the provinces of
Aurora An aurora ( aurorae or auroras), also commonly known as the northern lights (aurora borealis) or southern lights (aurora australis), is a natural light display in Earth's sky, predominantly observed in high-latitude regions (around the Arc ...
,
Pampanga Pampanga, officially the Province of Pampanga (; ; ), is a province in Central Luzon in the Philippines. Lying on the northern shore of Manila Bay, Pampanga is bordered by Tarlac to the north, Nueva Ecija to the northeast, Bulacan to the east, ...
,
Bulacan Bulacan, officially the Province of Bulacan (; ; ; ), is a Provinces of the Philippines, province in the Philippines located in the Central Luzon Regions of the Philippines, region. Its capital is the city of Malolos. Bulacan was established on ...
,
Tarlac Tarlac, officially the Province of Tarlac (; ; ; ; ), is a landlocked Provinces of the Philippines, province in the Philippines located in the Central Luzon Regions of the Philippines, region. It had a population of 1,503,456 people according to ...
, and
Angeles City Angeles (), officially the City of Angeles (; ), is a Cities of the Philippines#Legal classification, highly urbanized city in the Central Luzon region of the Philippines. According to the 2020 census, it has a population of 462,928 people. A ...
. On October 2, the NDRRMC finalized the death toll to 52, the number of injured to 63 and the number of missing to 30. Also, they announced that the total damage to agriculture and infrastructure was amounted to US$153,316,943; making it one of the most destructive tropical cyclones ever to hit the archipelago. However, again on October 3, the NDRRMC confirmed more deaths, putting the number of dead at 85; the number of injured at 65 and the number of missing at 2. Also, they announced that Nesat was one of the costliest typhoons to have affected the nation by putting the total damage from Nesat to both agriculture and infrastructure at US$333 million.


Highest Public Storm Warning Signal


China, Malaysia and Vietnam

On September 28, China's flood control authority activated their emergency response system so that they can cope up with the upcoming typhoons Nesat, and Nalgae. The authority requested local governments in relevant areas to closely monitor both the typhoons and keep the public aware of what is happening. They initiated a level IV typhoon response program and sent two working teams to the provinces of
Guangdong ) means "wide" or "vast", and has been associated with the region since the creation of Guang Prefecture in AD 226. The name "''Guang''" ultimately came from Guangxin ( zh, labels=no, first=t, t= , s=广信), an outpost established in Han dynasty ...
and
Hainan Hainan is an island provinces of China, province and the southernmost province of China. It consists of the eponymous Hainan Island and various smaller islands in the South China Sea under the province's administration. The name literally mean ...
so that they can assist people in all the preparations that they have to make. The passenger ferry services linking the southern island province of Hainan and the rest of the nation were halted as typhoon Nesat neared land. Nesat was expected to be the strongest to hit Hainan in six years. The Hainan provincial meteorological bureau's director, Cai Qinbo, advised all people living in coastal areas to evacuate and also to brace for flash floods and other storm related natural disasters that Nesat may bring to the nation. Ships were recalled, flight and ferry services were suspended and schools were shut as the strongest typhoon to directly impact Hainan in 2011 was approaching its final landfall. In order to ensure the safety of the children, most kindergartens, primary and middle schools in
Haikou Haikou; Chinese postal romanization, formerly romanized as Hoihow is the capital city, capital and most populous city of the Chinese province of Hainan. Haikou city is situated on the northern coast of Hainan, by the mouth of the Nandu River. ...
, the capital of Hainan suspended classes very early. The Meilan Airport in Haikou city canceled a total of 49 flights. In all, 5 people were killed in South China. Total economic losses in South China were amounted to be CNY 11.10971 billion (US$1.736 billion), including 2.86 billion CNY in Guangdong Province, 2.436 billion CNY in Guangxi, 5.81371 billion CNY from Hainan Province. Nesat approached China just one day after the preparations for it started. On September 29, the
Hong Kong Stock Exchange The Stock Exchange of Hong Kong (, SEHK, also known as Hong Kong Stock Exchange) is a stock exchange based in Hong Kong. It is one of the largest stock exchanges in Asia and the List of major stock exchanges, 9th largest globally by market ...
was shut down after the
Hong Kong Observatory The Hong Kong Observatory is a weather forecast agency of the government of Hong Kong. The Observatory forecasts the weather and issues warnings on weather-related hazards. It also monitors and makes assessments on radiation levels in Hong ...
hoisted a number eight storm signal. The government offices and courts were also closed, delaying the widely anticipated ruling in ''
Vallejos v. Commissioner of Registration ''Vallejos and Domingo v. Commissioner of Registration'' was a court case against the government of Hong Kong by two foreign domestic helpers (FDHs) seeking permanent residence and the right of abode in Hong Kong. Because of its subject matte ...
''. The strong winds injured at least three people after Nesat slammed into the southern Chinese island of Hainan forcing more than 100,000 people to leave their homes. Nesat was one of the strongest storms to strike the nation after the highest storm warning in two years was issued in Hong Kong as Typhoon Nesat swept past the city. All flights and high-speed railway services to the resort city of Sanya in Hainan were canceled or indefinitely delayed as the typhoon approached. Powerful tail winds from Nesat affected areas in the west coast of
Sabah Sabah () is a States and federal territories of Malaysia, state of Malaysia located in northern Borneo, in the region of East Malaysia. Sabah has land borders with the Malaysian state of Sarawak to the southwest and Indonesia's North Kalima ...
on the northern part of
Borneo Borneo () is the List of islands by area, third-largest island in the world, with an area of , and population of 23,053,723 (2020 national censuses). Situated at the geographic centre of Maritime Southeast Asia, it is one of the Greater Sunda ...
. The winds caused power lines being knocked down causing power outages affecting 15,000 consumers. The winds also caused trees being uprooted, and roofs and billboards destroyed. State Meteorological Department recorded winds up to 95 km/h. The typhoon then hit
Vietnam Vietnam, officially the Socialist Republic of Vietnam (SRV), is a country at the eastern edge of mainland Southeast Asia, with an area of about and a population of over 100 million, making it the world's List of countries and depende ...
and weakened into a tropical storm. The disaster officials in Vietnam said that "The fish and shrimp farmers had been moved to safe areas along the northern and central coasts. Some 4,000 people, mostly the elderly, women and children, were also evacuated in three coastal districts in Nam Định province." Because of the low strength of the storm, the damages from Nesat to china were expected to be near US$50 million. AIR Worldwide said that "Insurance penetration for typhoons is quite low in China, particularly for residential risks, and insurance penetration varies by province, Hainan having one of the lowest rates in China." However, on October 4, the state run Xinhua News Agency confirmed that the damage exceeded 900 million United States dollars or 5.8 billion yuan as Nesat was one of the strongest typhoons to hit Hainan, affecting at least 3.77 million people.


Hong Kong and Macau

In
Hong Kong Hong Kong)., Legally Hong Kong, China in international treaties and organizations. is a special administrative region of China. With 7.5 million residents in a territory, Hong Kong is the fourth most densely populated region in the wor ...
, many functions and activities were canceled or postponed because of the fast approaching storm. The Hong Kong's stock market, all courts, tribunals, court registries and offices were completely shut for the rest of September 29. Also, the education bureau announced suspension of all classes and the Hospital Authority suspended general out-patient and specialist clinics for the entire day too. In order to help people in need of refuge during the landfall, the city's Home Affairs Department opened 11 temporary shelters in various districts across Hong Kong. Macao's public transportation system was also suspended after typhoon signal No. 8 was hoisted by most local meteorological authorities. Macao's Meteorological and Geophysical Bureau issued signal 8 while the storm was estimated to be about 350 km south of Macao at 4:00 a.m. local time. The local traffic authorities reacted in a timely manner and closed all the three sea-crossing bridges of the island city. Late on September 27, the Hong Kong Observatory and the Macau Weather bureau hoisted the standby signal no.1, so that residents of the regions, could start to make preparations for the incoming typhoon. Both weather offices then issued Strong Wind Signal No. 3 later that day, before hoisting issuing the No. 8 Gale or Storm Signal on September 29 as Nesat started to affect the regions with easterly gale-force windspeeds. All signals were then lowered during September 30. Within Hong Kong, 418 reports of fallen trees and 15 reports of collapsed scaffolding were received by the Hong Kong Observatory, with a total of 25 people injured while at the Hong Kong airport over 40 flights were cancelled due to the adverse weather associated with Nesat.


Aftermath


Typhoon Nalgae

On September 30, the Americans living in
Philippines The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ...
were reminded by the
United States government The Federal Government of the United States of America (U.S. federal government or U.S. government) is the Federation#Federal governments, national government of the United States. The U.S. federal government is composed of three distinct ...
"to carry their travel documents at all times and secure them in a safe and
waterproof Waterproofing is the process of making an object, person or structure waterproof or water-resistant so that it remains relatively unaffected by water or resists the ingress of water under specified conditions. Such items may be used in wet env ...
location." The government launched the
helpline A helpline, or switchboard, is a telephone service which offers help to those who call. Many helpline services now offer more than telephone support - offering access to information, advice or customer service via telephone, email, web or SMS. ...
numbers 1-888-407-4747 and 1-202-501-4444 so that the people traveling within the nation can obtain updated information from the Department of State. Also, the PAGASA insisted all people living in the low-lying areas to leave immediately. The said that "Even areas that are currently not flooded are in danger because water from flooded communities will eventually seep into neighboring areas." The PAGASA hoisted public storm warning signal number 3 in
Cagayan Cagayan ( ), officially the Province of Cagayan (; ; ; isnag language, Isnag: ''Provinsia nga Cagayan''; ivatan language, Ivatan: ''Provinsiya nu Cagayan''; ; ), is a Provinces of the Philippines, province in the Philippines located in the Cag ...
and
Isabela Isabela may refer to: People with the given name * Isabela Boscov, Brazilian film critic * Isabela Corona (1913–1993), Mexican actress * Isabela Garcia (born 1967), Brazilian actress * Isabela Moraes (born 1980), Brazilian synchronized swimmer ...
provinces as the storm drifted closer. They said that "The coming storm is expected to bring strong winds, but authorities are more concerned about the amount of rainfall it will pour." Fears worsened as the typhoon came in less than 5 days after Nesat devastated the same place and also lead to a ''state of calamity'' being declared. Five towns in Cagayan were still flooded and the same place was to be hit by Nalgae, which is much more stronger than Nesat. The extremely strong winds blown by Nalgae set off a rockslide in northern Bontoc provincecausing boulders to roll down a mountainside and smash on a passing van, killing one man. In the rice-growing province of
Bulacan Bulacan, officially the Province of Bulacan (; ; ; ), is a Provinces of the Philippines, province in the Philippines located in the Central Luzon Regions of the Philippines, region. Its capital is the city of Malolos. Bulacan was established on ...
north of Manila, several hundreds of people in several towns remained trapped on their rooftops as the floodwaters brought by Nesat never retreated and more flooding and rain was brought by Nalgae. Rescuers aboard rubber boats could not reach them because the alleyways were too narrow. Officials said that two army
helicopters A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attribu ...
would be later deployed to rescue the victims. The Rescue workers scrambled through the floodwaters on October 2, so that they could be able to deliver food, water and other relief materials to hundreds of villagers stuck on rooftops since several days after the twin typhoons ravaged the nation. Seven towns north of Manila including Calumpit in rice-growing Bulacan province continued to be under waist-high waters after the rains brought by Nalgae, the 17th tropical cyclone to affect the disaster-prone nation in 2011. Helicopters were able to deliver food via air, but could rescue none of those who were on the rooftops since 4 days. On October 3, Philippine authorities rushed aid to thousands of people marooned in their flooded homes for a week since Nesat and Nalgae together battered the nation. After a long time, the flood water slowly started receding and the rescue workers were able to deliver food and other relief materials to those in need. In
Calumpit Calumpit , officially the Municipality of Calumpit (, Kapampangan: ''Balen ning Calumpit''), is a municipality in the province of Bulacan, Philippines. According to the 2020 census, it has a population of 118,471 people. The name "''Calumpit' ...
. one of the worst hit towns, a construction worker in line for receiving the relief materials said to a new agency, "We have no food to eat, and no clean drinking water." It was later reported that at least 8 million people living in the Philippines have experience faced much worse floods than the earlier destruction caused by typhoon Nesat. The disaster management chief Benito Ramos said "The fight is not over yet. I hope the (Nesat) floods will wash out to Manila Bay before the (Nalgae) runoff hits the area. If the latter catches up to the former, there won’t be any rooftops left to see above the floodwaters." The local weather agency announced that the water levels on the tributaries of major central Luzon rivers were still continuing to rise fast and posed a threat to the nearby towns and villages.


Retirement

Due to extremely high amount of damage that the storm has caused in the Philippines, the PAGASA announced that the name, Pedring would be stricken off their tropical cyclone naming lists despite its first usage. In June 2012 the name Perla was chosen by PAGASA for the 2015 season. However, due to the limited number of typhoons that entered Philippine area of Responsibility on that year, the name wasn't used, and instead was first used in the
2019 season Nineteen or 19 may refer to: * 19 (number) * One of the years 19 BC, AD 19, 1919, 2019 Films * ''19'' (film), a 2001 Japanese film * ''Nineteen'' (1987 film), a 1987 science fiction film * '' 19-Nineteen'', a 2009 South Korean film * '' Dici ...
.


See also

*
Tropical cyclones in 2011 During 2011, tropical cyclones formed within seven different tropical cyclone basins, located within various parts of the Atlantic, Pacific and Indian Oceans. During the year, a total of 131 tropical cyclones had formed this year to date. 71 tr ...
Other similar comparisons to Nesat: * Typhoon Elsie (Tasing; 1989) – a stronger typhoon that made an almost identical path to Nesat. * Typhoon Nari (Santi; 2013) – also affected Northern and Central Luzon two years after Nesat. * Typhoon Kalmaegi (Luis; 2014) – took a similar track. * Typhoon Sarika (Karen; 2016) – had a comparable trajectory to Nesat. * Typhoon Yutu (Rosita; 2018) – a large and strong typhoon that traversed through Central Luzon. * Typhoon Saudel (Pepito; 2020) – a moderate typhoon that had a comparable track but made landfall as a tropical storm. * Typhoon Noru (Karding; 2022) – a smaller but slightly stronger typhoon that also severely affected Luzon. * Tropical Storm Talim (Dodong; 2023) – a compact storm that affected Luzon as a tropical depression. * Tropical Storm Trami (Kristine; 2024) – a devastating storm that caused widespread torrential rains as it affects Luzon. *
Tropical Storm Wutip (2025) Severe Tropical Storm Wutip was a tropical cyclone that impacted South China in early June 2025. The first tropical cyclone naming, named storm of the 2025 Pacific typhoon season, annual typhoon season, Wutip’s origins can be traced back to J ...
- a severe tropical storm that flooded
San Jose del Monte San Jose del Monte, officially the City of San Jose del Monte (abbreviated as SJDM or CSJDM); ; ; ; ; ), is a component city in the province of Bulacan, Philippines. According to the 2020 census, it has a population of 651,813 people, maki ...
and struck China, but similar trajectory to Nesat. Other tropical cyclones that caused severe damage to Metro Manila: * Typhoon Patsy (Yoling; 1970) * Typhoon Vera (Bebeng; 1983) * Typhoon Ruby (Unsang; 1988) * Typhoon Angela (Rosing; 1995) * Typhoon Xangsane (Milenyo; 2006) * Typhoon Fengshen (Frank; 2008) * Typhoon Ketsana (Ondoy; 2009) * Typhoon Rammasun (Glenda; 2014) * Tropical Storm Fung-wong (Mario; 2014) * Typhoon Vamco (Ulysses; 2020) * Tropical Storm Nalgae (Paeng; 2022) * Typhoon Gaemi (Carina; 2024) – a destructive typhoon that didn't make landfall in the Philippines but severely affected Metro Manila.


References


External links


JMA General Information
of Typhoon Nesat (1117) from Digital Typhoon *The JMA'
Best Track Data
on Typhoon Nesat (1117) *The JMA'
RSMC Best Track Data (Graphics)
on Typhoon Nesat (1117) *The JMA'

*The JTWC'
Best Track Data
on Typhoon 20W (Nesat)
20W.NESAT
from the U.S. Naval Research Laboratory {{DEFAULTSORT:Nesat (2011) Nesat Nesat Nesat Nesat Nesat Nesat Nesat Nesat Nesat Nesat September 2011 in Asia Nesat