2006 Pacific Typhoon Season

The 2006 Pacific typhoon season was a below-average season that produced a total of 23 named storms, 15 typhoons, and six super typhoons. The season ran throughout 2006, though most tropical cyclones typically develop between May and October. The season's first named storm, Chanchu, developed on May 9, while the season's last named storm, Trami, dissipated on December 20.

Despite being below-average and having the same number of named storms like the previous season, this season was costlier and deadlier, as several tropical cyclones affected land areas. Moreover, this season featured typhoons which made landfall at a higher intensity, with the ratio of intense typhoons at 0.73, the highest since 1970. China was hit by several storms, with Tropical Storm Bilis and Typhoon Saomai being the most notable. Bilis became the costliest typhoon of the season, with damage totals at $4.4 billion (2006 USD); it also became the second-deadliest storm of the season, killing at least 800. Saomai became the most powerful typhoon to strike the country in 50 years, and was responsible for 456 deaths and $2.5 billion worth of damages. The Philippines got hit by a total of six typhoons – the highest since 1974 – the most significant being Typhoons Xangsane and Durian. Xangsane was the strongest to affect Manila in 11 years, while Durian became the deadliest typhoon of the season, with at least 1,000 fatalities. Meanwhile, Japan also had its share of destructive typhoons; Typhoon Shanshan hit the country in mid-September, resulting to 11 deaths and damages amounting to $2.5 billion. Furthermore, Typhoon Ioke, the strongest Central Pacific hurricane, also entered the basin and hit Wake Island; damages were estimated to be at $88 million.

The scope of this article is limited to the Pacific Ocean to the north of the equator between 100°E and 180th meridian. Within the northwestern Pacific Ocean, there are two separate agencies that assign names to tropical cyclones which can often result in a cyclone having two names. The Japan Meteorological Agency (JMA) will name a tropical cyclone should it be judged to have 10-minute sustained wind speeds of at least anywhere in the basin, whilst the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) assigns names to tropical cyclones which move into or form as a tropical depression in their area of responsibility located between 135°E and 115°E and between 5°N–25°N regardless of whether or not a tropical cyclone has already been given a name by the JMA. Tropical depressions that are monitored by the United States' Joint Typhoon Warning Center (JTWC) are given a number with a "W" suffix.

Seasonal forecasts

During the year several national meteorological services and scientific agencies forecast how many tropical cyclones, tropical storms, and typhoons will form during a season and/or how many tropical cyclones will affect a particular country. These agencies included the Tropical Storm Risk (TSR) Consortium of University College London, PAGASA and Taiwan's Central Weather Bureau. Some of the forecasts took into consideration what happened in previous seasons and the La Niña conditions that were observed during the previous year.

On March 7, Tropical Storm Risk issued its first forecast for the season at an extended-range, forecasting a close to average season of 27 tropical storms, 17 typhoons and 8 intense typhoons. The ACE predicted was around 298. By May 5, Tropical Storm Risk issued their second forecast for the season, raising their numbers to 29 tropical storms, 19 typhoons and 9 intense typhoons, with an ACE of 326. This is due to the observed warming of sea-surface temperatures in the Niño 3.75 region and current patterns within the Central Pacific, indicating slightly higher activity. TSR released its third forecast for the season on June 7, predicting the same numbers with the same reason. Though on their fourth forecast during July 5, TSR stated that the 2006 season will be 15% above the 1965–2005 norm. Therefore, they raised the number of intense typhoons to 10, and their ACE to 349. The other reason behind this is due to the fact that there was an increase in tropical activity and much warmer SSTs over in the Niño 3.75 region than the previous forecast. On August 4, TSR released their final forecast. They reduced the number of intense typhoons to 9, and the ACE to 325. This was because it was reported that a slight decrease in tropical activity from the previous forecast and is due solely of a slight decrease in SSTs over in the same region.

Seasonal summary

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from:01/12/2006 till:01/01/2007 text:December

The accumulated cyclone energy (ACE) index for the 2006 Pacific typhoon season as calculated by Colorado State University using data from the National Hurricane Center was 321.3 units. Broadly speaking, ACE is a measure of the power of a tropical or subtropical storm multiplied by the length of time it existed. It is only calculated for full advisories on specific tropical and subtropical systems reaching or exceeding wind speeds of .

The Pacific typhoon season runs throughout 2006 and has no official bounds, though most tropical cyclones from this basin generally develops from the months from May through to October. Despite the season turned out to be active, most tropical cyclones developed during the second half of the year, with only one typhoon, Chanchu developing during the month of May. Some minor systems also developed before May, with the first tropical system of the year, Agaton, developing to the east of Philippines on January 20, bringing minor damages as it crossed the country few days later.

Tropical cyclogenesis had become much favorable during late June with formations of Jelawat and Ewiniar. It was also during the same time when NOAA had stated that the weak 2006–07 El Niño had started. From mid July to early August, three "back-to-back" storms made landfall over in China, which were Bilis, Kaemi and Prapiroon. With all three combined, more than 900 people have been dead and damages were reported more than US$5 billion. Shortly thereafter, environments throughout most of the basin became favorable with less shear, more convection and warmer water, as three simultaneous storms, Maria, Saomai and Bopha, formed and affected three different landmasses such as Japan, China and Taiwan, respectively. Later in the same month, Hurricane Ioke had entered the basin from the Central Pacific as the strongest Central Pacific storm in recorded history, as a Category 5 powerful storm.

On September, an unnamed and unclassified tropical storm have been discovered by meteorologist Gary Padgett and Dr. Karl Hoarau. Later, Typhoon Xangsane affected Luzon, Philippines, causing major damages with more than 200 people dead. The country saw four storms making landfall, with three of them reaching Category 4 or 5 super typhoon status. Typhoon Cimaron made landfall over in northern Luzon as a Category 5 super typhoon with minimal damages. By November, Typhoon Chebi made landfall in the same area as Cimaron, though effects from the typhoon were much smaller than Cimaron. Although by late November, Typhoon Durian made landfall in Bicol region. Combined effects with ash from the Mayon Volcano had killed over 1,500 people and damages at least US$530 million. Durian also crossed the basin and into the North Indian Ocean basin, the first time since 2003. During early December, two systems formed. Typhoon Utor crossed Visayas with minimal damage; and Tropical Storm Trami, a very weak system that didn't affect any landmasses became the final tropical cyclone and dissipated on December 20.

Systems

Tropical Depression Agaton

On January 20, the JMA began monitoring a minor tropical depression located about east of Mindanao in the southern Philippines. As it traveled in an erratic northwestward direction, it slowly became better organized. On January 23, the JMA assessed the storm to have attained winds of 55 km/h (35 mph 10-minute winds). Around the same time, PAGASA began issuing advisories on the system and gave it the local name ''Agaton''. The depression weakened as it crossed over northern Samar Island and southern Luzon. Traveling towards the west, the system failed to strengthen and dissipated on January 27 while located over the South China Sea, about halfway between Vietnam and Borneo.

Tropical Depression 01W (Basyang)

On March 4, a tropical depression formed out of a wave close to the equator southeast of Palau. The JTWC upgraded it to Tropical Storm 01W at 3 p.m. UTC the same day. The JTWC downgraded it back to a depression on March 5 due to shear, and it never regained tropical storm strength before dissipating on March 7.

Typhoon Chanchu (Caloy)

On May 8, the JMA started to track a tropical depression about 175 km (110 mi) northeast of Palau, and later the JTWC followed suit giving the designation of ''02W''. By the next day, 02W had intensified into a tropical storm, with the JMA naming it ''Chanchu''. The PAGASA had also declared that Chanchu had entered their area, giving the local name ''Caloy''. Chanchu reached typhoon intensity and made its first landfall over in Samar on May 11, and several hours later, it struck Mindoro at Category 2 typhoon intensity. As Chanchu emerged to the South China Sea, and moved northward, the storm explosively intensified into a Category 4 typhoon and reached peak intensity with 10-minute sustained winds of on May 15. By May 17, Chanchu rapidly weakened into a severe tropical storm as it made its landfall over in Shantou, Guandong. Both the JMA and the JTWC issued its final advisory on May 18 as it became extratropical.

In the Philippines, the storm caused 41 deaths and a total of ₱117.6 million (US$2.15 million) in damage. Though Chanchu didn't made landfall over in Vietnam, several ships sunk and were lost. A total of 18 people, who are fishermen, were dead. Chanchu is also the most intense typhoon on Hong Kong Observatory's record to enter the South China Sea in May. Chanchu necessitated the Strong Wind Signal no. 3 in both Hong Kong and Macau. In Hong Kong, the Gale force signal 8 should have been hoisted for at least 10 hours as sustained gales were affecting the Eastern part of the territory, where the hourly mean wind reached 83 km/h, with gust reaching over 100 km/h in some areas. Overall damage in China was at ¥7 billion (US$872 million).

Tropical Storm Jelawat (Domeng)

On June 24, the JMA started to track a weak tropical depression located to the southeast of Samar, Visayas. After crossing the archipelago, as it emerged to the South China Sea on June 26, the PAGASA named it ''Domeng'' while the JTWC had started issuing advisories with the designation of ''03W''. Moving northwestward, 03W had entered in an area of favorable environments and intensified into a tropical storm, with the naming of ''Jelawat'' on June 27. Jelawat made landfall over Southern China and fully dissipated inland on June 29.

The storm dropped heavy rainfall across southern China and Haikou recorded a rainfall of 309.7 mm (12 inches) during the storm passage. A total of 8.6 inches (220 mm) rain fell in 16 hours in Kampung Bundu, Malaysia. The rainfall killed seven people and left one missing. The flooding from Jelawat ruined 200 square kilometres of farmland and destroyed 190 houses.Shanghai Daily , 上海日报 – English Window to China News
/ref>

Typhoon Ewiniar (Ester)

On June 29, a persistent tropical disturbance was classified as a tropical depression by the JTWC while east of Palau. The depression moved northwestward and was upgraded to Tropical Storm 04W by the JTWC on June 30. The JMA designated the storm Tropical Storm Ewiniar at around the same time. The name "Ewiniar" was submitted by the Federated States of Micronesia, and refers to a traditional storm god of Chuuk.

Ewiniar was responsible for at least 30 deaths in China, which it brushed as a typhoon. The typhoon gradually weakened as it moved over colder waters, and made landfall in South Korea on July 10 as a severe tropical storm. As Ewiniar moved across the country, it passed within of Seoul. The storm brought heavy rain that triggered floods and mudslides in the southern part of the country, killing at least six people. Ewiniar became extratropical over the Sea of Japan on the same day.

Severe Tropical Storm Bilis (Florita)

A tropical disturbance northeast of Yap developed sufficient convection to be designated a tropical depression on July 8. The depression strengthened into a tropical storm the next day, and was designated Tropical Storm Bilis by the JMA. The word "Bilis", submitted by the Philippines, means speed or swiftness. PAGASA operationally treated this storm as a typhoon for a short time on July 13, but it officially remained a tropical storm as it moved west-northwestward toward Taiwan. After moving over northern Taiwan, Bilis made landfall in Fujian, China at 12:50 p.m. CST on July 14, weakening into a tropical depression inland the next day. JMA carried the system as a tropical depression until July 17. Bilis brought very heavy rain, widespread flooding, landslides, and strong winds to the Philippines, Taiwan and areas of mainland China, causing 672 deaths and $4.4 billion (2006 US$) in damage.

Typhoon Kaemi (Glenda)

A tropical depression formed on July 18 near the Caroline Islands, it quickly strengthened to tropical storm strength the same day. On July 19, the storm was named Kaemi by the JMA. The correct name Gaemi was submitted by South Korea and is a Korean word for ant. It strengthened into a severe tropical storm on July 20, and further deepened into a typhoon 24 hours later. Kaemi made landfall in Jinjiang, Fujian at 3:50 p.m. CST on July 25 as a minimal typhoon.

Heavy rainfall in Taiwan caused flooding and four minor injuries. Rain also fell heavily in the northern Philippines. The storm has also killed at least 32 people in China, while another 60 people are missing. Agricultural losses in Taiwan amounted to NT$73 million (US$2.2 million). Total damages from the storm amounted to $450 million.

Typhoon Prapiroon (Henry)

PAGASA named a system east of the Philippines as Tropical Depression Henry later on the same day that the JMA recognised it as a tropical depression on July 27. The JTWC upgraded this system to a tropical storm on the morning of August 1. Hong Kong Observatory also did so and issued the Tropical Cyclone Signal No. 1 that same afternoon, and shortly after the JMA upgraded the system to Tropical Storm Prapiroon. The name Prapiroon was submitted by Thailand and is the name of a Thai rain deity. The JMA upgraded the storm to a severe tropical storm on the morning of August 2. PAGASA ceased advisories on the storm shortly after as it moved out of its area of responsibility. The JTWC and the HKO upgraded Prapiroon to a typhoon at 3 a.m. UTC, while the JMA officially upgraded it to a typhoon at 12 p.m. UTC (8 p.m. HKT). Prapiroon necessitated the first Tropical Cyclone Signal No. 8 in Macau this year. In Hong Kong, the flag raising ceremony at the Golden Bauhinia Square was cancelled due to strong wind. Prapiroon made landfall at 7:20 p.m. CST on August 3.

The strong winds due to the storm resulted in 70% of flights being cancelled, delayed or diverted in the Hong Kong International Airport, the highest since the opening in 1999. However, the airport remained open throughout the storm passage and many flights successfully landed or took off on August 3. Inbound flights were rerouted to nearby airports and outbound flights were cancelled or postponed. On landfall in Guangdong province, China, it forced the evacuation of some 660,000 people and caused an estimated 5.4 billion Chinese yuan worth of damage. 77 people were reported killed. It also affected Hunan, Guangxi and Hainan. Prapiroon degenerated into an area of low pressure on August 6.

Typhoon Maria

Maria formed out of a tropical depression over the open waters of the western Pacific Ocean. On August 5, the JMA classified the depression as a tropical storm while the JTWC kept it as a depression. The storm quickly strengthened into a typhoon the next day, reaching its peak intensity with winds of early on August 6. The storm gradually weakened as it began to recurve, causing it to parallel the southeastern coast of Japan. On August 9, Maria weakened into a tropical depression and later into an extratropical cyclone before dissipating on August 15. Maria had only minor effects in Japan, mainly heavy rains which were estimated to have peaked over 400 mm (15.7 in) on the Izu Peninsula. One person was killed after being struck by lightning and six others were injured.

Typhoon Saomai (Juan)

The JTWC identified a tropical depression near the Caroline Islands late on August 4 UTC. The JMA designated it as such at 12 a.m. UTC August 5. Nine hours later, the JTWC upgraded Tropical Depression 08W to a tropical storm, three hours before the JMA named it Saomai. The name is from the Vietnamese " sao Mai", meaning "Morning Star", a reference to the planet Venus.

The JTWC designated it a typhoon at 3 p.m. UTC August 6. The JMA upgraded Saomai to a Severe Tropical Storm at 6 p.m. UTC, and as it continued to strengthen, it was upgraded to a typhoon just 12 hours later. Saomai passed into the Area of Responsibility of PAGASA on August 8 and was named Typhoon Juan by PAGASA. On August 8, the storm underwent explosive development, and by August 9 it had become a Category 5-equivalent super typhoon.

Saomai made landfall in Zhejiang, China on August 10 with maximum sustained winds of 115 knots (1-minute mean), stronger than Chanchu earlier this season. Saomai was responsible for at least 458 deaths, mostly in China, and $2.5 billion (2006 USD) in damage.

Severe Tropical Storm Bopha (Inday)

The JMA identified a tropical depression in the open Pacific on August 5. PAGASA named this storm late on August 5 as it was forecast to enhance the southwest monsoon and bring rains to the Philippines. Around 1800 UTC, the JTWC declared that the system had developed into a tropical depression and gave it the number 10W. JMA upgraded it to Tropical Storm Bopha on August 6. The name Bopha was submitted by Cambodia and is a flower and girls' name. Around this time, the JTWC also upgraded the system to a tropical storm.

The JTWC recognised its existence as a tropical depression at 9 a.m. UTC the same day before upgrading it to a tropical storm at 3 p.m. UTC. The JMA then upgraded it to a severe tropical storm as it slowly churned westwards at 12 a.m. UTC August 7 before downgrading it 18 hours later. Bopha unexpectedly restrengthened into a severe tropical storm at 3 a.m. UTC August 8, before weakening back to a tropical storm at 12 p.m. UTC.

Bopha later made landfall on Taiwan at about 2 a.m. local time on August 9. At this time, the JTWC reported that Bopha attained winds of . Tropical Storm Bopha then weakened into a tropical depression before degenerating into a remnant low on August 10.

The outer bands

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