The 2004 Pacific typhoon season was an extremely active season, which featured 29 named storms, nineteen typhoons, and six super typhoons. It was an event in the annual cycle of tropical cyclone formation, in which tropical cyclones form in the western Pacific Ocean. The season ran throughout 2004, though most tropical cyclones typically develop between May and December. The season's first named storm and also the first typhoon, Sudal, developed on April 4, later was reached typhoon status two days later, and became the first super typhoon of the year three days later. The season's last named storm, Noru, dissipated on December 22.
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) names 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 and 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.
The season's high activity was brought on due to the presence of a Modoki El Niño - a rare type of El Niño in which extremely favorable conditions exist in the Western Pacific basin due to the normally warmer-than-average waters shifting further westward.__TOC__
Seasonal summary
The activity of the season was extremely high, while the impacts of the typhoons were damaging and deadly, including four consecutive typhoons that struck them in the Philippines. In August, Typhoon Rananim struck Taiwan and China causing widespread damage, killing 169 people and with an estimated $2.44 billion (USD 2004) in damage. Typhoon Aere also caused heavy damage in China after Rananim killed 107 people there with minimal damage. Typhoon Songda was the costliest typhoon of the season to hit Japan, with damage estimated at $9.3 billion (US$2004) and 28 people killed. In October, Typhoon Tokage hit Japan as a tropical storm, causing a total of 95 deaths and damage estimated at $2.3 billion (2004 USD). Tropical Depression Winnie struck the Philippines killing a total of 1,593 people, making Winnie the deadliest storm of the season since Tropical Storm Thelma in 1991. After the month of November, the seasonal activity onwards decreased. The activity during the month included two typhoons. Muifa struck the Philippines after Winnie, killing 68 people and subsequently bringing heavy rains to Thailand killing 40 people. The fourth and last consecutive typhoon to hit the Philippines was Nanmadol which made landfall as a Category 4 typhoon in that country, killing a total of 77 people.
The Accumulated Cyclone Energy (ACE) index of this season amounted to 60% above the normal level for Pacific typhoon seasons, calculated by Colorado State University using data from the Joint Typhoon Warning Center to be 480.6 units. This makes the season the second-most intense Pacific typhoon season in recorded history, only after 1997. 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 .
Systems Tropical Depression 01W (Ambo)
The first tropical storm of the 2004 Pacific typhoon season developed on February 10 west of Chuuk. It tracked to the west, organizing slowly due to persistent vertical wind shear. On February 13 and 14, the depression executed a clockwise loop. When the storm turned to the southwest, the wind shear overcame it, and the cyclone dissipated on February 19. The remnants of Tropical Depression Ambo dissipated, affecting Luzon by bringing flash floods and heavy rainfall on February 20 until February 22.
Tropical Depression 02W (Butchoy)
The near-equatorial trough spawned a tropical disturbance east of the Philippines late on March 13. It rapidly moved northwest as it became a tropical depression in the afternoon hours of the next day. Due to warm waters and moderate convection, it rapidly intensified, with a brief turn to the southwest. On March 17, it reached peak intensity as a tropical storm, with the PAGASA naming it as Butchoy. The system rapidly weakened on March 19, just before the storm was about to hit the Philippines. A weak trough brought it northward, where dry air and vertical shear caused it to dissipate on March 23.
Typhoon Sudal (Cosme)
On April 5, Tropical Depression 03W began its life between Chuuk and Pohnpei. As it drifted to the northwest, it strengthened into a tropical storm. Sudal turned to the west, and steadily intensified to become a typhoon on April 6. On the April 9, with maximum sustained winds of 115 kn/130 mph, Typhoon Sudal hit the island of Yap. After ravaging the island, Sudal reached a peak of 130 kn/150 mph winds. The typhoon turned to the northeast and became extratropical early on April 16.
Yap experienced catastrophic damage, with 90% of buildings destroyed, 1,500 left homeless, but fortunately no fatalities. Sudal is a Korean word meaning otter.
Typhoon Nida (Dindo)
A monsoon trough spawned Tropical Depression 04W east of the Philippines on May 13. The depression quickly strengthened, reaching tropical storm intensity on May 14 and typhoon status just six hours later. On May 15 and 16 while moving northwest towards the Philippine coast, Nida rapidly intensified to a 140 kn/160 mph super typhoon, and crossed the eastern Philippines shortly thereafter. Nida weakened slightly over the islands, and began to move to the north and northeast in response to a break in the subtropical ridge. It became extratropical on May 21 east of Japan, after causing 31 deaths and about $1.3 million in damage. Nida is a Thai female name.
In the Philippines, evacuation centers were opened to accommodate 2,986 people. The typhoon approach canceled ferry operations stranding 15,057 passengers.May 2004 Monthly Global Tropical Cyclone Summary In Taiwan, forecasters at the Central Weather Bureau issued a typhoon warning as forecast models predicted a high probability of the typhoon hitting Taiwan.Central Weather Bureau A Real-time MM5/WRF Forecasting system in Taiwan URL Accessed: September 26, 2006
Tropical Depression 05W
A small tropical disturbance rapidly formed, moving southwest on May 12. The small system rapidly built up on May 13. The next day, the JTWC classified it as Tropical Depression 05W. 05W moved west, affecting Vietnam and reached peak intensity as a tropical storm on May 15 and 16. With two other systems in the Western Pacific, Typhoon Nida and Tropical Storm Omais, 05W turned eastwards, weakening on May 17. Dissipating on May 18, and due to the strong pull of the outflow of Typhoon Nida at peak intensity, the remnants of 05W rapidly moved and was located about east of Philippines and was absorbed by a trough on May 20. The circulation fully dissipated on May 25 as it was absorbed by a monsoonal trough.
Severe Tropical Storm Omais (Enteng)
A tropical disturbance southwest of Chuuk organized into a tropical depression on May 16, one of 3 active tropical cyclones in the Western Pacific at the time. The depression developed quickly, reaching tropical storm status later that day and reaching a peak of 60 kn/70 mph winds three days later on May 19. A weakening ridge brought Omais northward, where it became extratropical on May 22.
Operationally, Omais was classified as a typhoon, but in post-analysis, it was dropped to a severe tropical storm. Omais is a Palauan word meaning 'wandering around'.
Typhoon Conson (Frank)
In the South China Sea, a stationary area of disturbed weather developed into Tropical Depression 07W on June 4. It tracked eastward then northeastward, becoming a tropical storm on June 5 and a typhoon on June 7. Conson passed between Luzon and Taiwan, and peaked with 100 kn/115 mph winds on June 9. Conson weakened as it continued northeastward, and became extratropical on June 11 near Japan without causing any reported damage. Conson is an area in Vietnam containing many historical monuments.
Severe Tropical Storm Chanthu (Gener)
Originating from an area of low pressure on June 5, 2004, Chanthu was first declared a tropical depression near southern Leyte Island, in the Philippines, on June 7. Tracking west-northwestward, the depression intensified into a tropical storm over the central Philippines before entering the South China Sea. Once over the warm waters of the sea, the system quickly intensified, attaining its peak 10-minute winds of and 1-minute winds of . On June 12, the storm made landfall in Vietnam before quickly weakening over land. By June 13, the system had weakened to a tropical depression and dissipated two days later.
During the time Typhoon Chanthu affected Vietnam, the highest sustained wind speed recorded on land was in An Nhơn (Bình Định), and the lowest recorded atmospheric pressure was in Quy Nhơn.
In Vietnam, Chanthu wrought substantial damage and killed 38 people. Damage from the storm was estimated at 125 billion Vietnam dong (US$7.9 million), mostly from agricultural losses. The remnants of Chanthu also brought heavy rains to Cambodia, estimated to have exceeded .
Typhoon Dianmu (Helen)
Tropical Depression 09W, which developed from the monsoon trough on June 13, headed north in the open Western Pacific. On the June 15 and 16, Dianmu rapidly intensified from a 70 kn/80 mph typhoon to a 155 kn/180 mph super typhoon, one of nine typhoons since 1990 to reach that intensity. It lost some organization on June 18, but re-strengthened on June 19 to a super typhoon while south of Okinawa. Some dry air weakened Dianmu as it continued its northward movement, and hit southern Japan as a 55 kn/65 mph tropical storm on June 21. Dianmu became extratropical that night after causing 3 deaths. Dianmu is the name of the goddess of thunder and lightning in Chinese folklore.
Typhoon Mindulle (Igme)
The monsoon trough spawned a tropical depression on June 23 near Guam. It tracked westward, becoming a tropical storm that night but slowly strengthening as it continued westward due to vertical wind shear. When the shear abated, Mindulle quickly intensified, reaching typhoon strength on June 27 and peaking at 125 kn/145 mph winds on June 28. Land interaction with Luzon to its south weakened Mindulle, and the typhoon weakened as it turned northward. On July 1, Mindulle hit eastern Taiwan, and after accelerating to the northeast became extratropical near South Korea on July 4.
Mindulle caused 56 deaths, with $833 million in damage in its path (2004 USD). Mindulle is the Korean word for the dandelion.
Typhoon Tingting
Tropical Depression 11W, which developed from the monsoon trough on June 25, steadily strengthened as it tracked to the northwest, and reached tropical storm status on June 26. Tingting passed Saipan on June 27, and reached typhoon status early on June 28. After maximum sustained winds peaked at 80 kn/90 mph, the typhoon turned to the northeast, where it became extratropical on July 3 after causing 3 deaths on Saipan. Tingting is a pet name for young girls in Chinese.
Tropical Storm Kompasu (Julian)