2004 Pacific typhoon season
| 2004 Pacific typhoon season | |
|---|---|
Season summary map
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| Seasonal boundaries | |
| First system formed | February 11, 2004 |
| Last system dissipated | December 21, 2004 |
| Strongest storm | |
| Name | Chaba |
| • Maximum winds | 205 km/h (125 mph) (10-minute sustained) |
| • Lowest pressure | 910 hPa (mbar) |
| Seasonal statistics | |
| Total depressions | 45 |
| Total storms | 29 |
| Typhoons | 19 |
| Super typhoons | 7 (unofficial) |
| Total fatalities | 2,402 |
| Total damage | At least $18.1 billion (2004 USD) |
| Related articles | |
| Tropical depression (JMA) | |
| Tropical storm (SSHWS) | |
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| Duration | February 11 – February 16 |
|---|---|
| Peak intensity | 55 km/h (35 mph) (10-min) 1002 hPa (mbar) |
| Tropical depression (JMA) | |
| Tropical storm (SSHWS) | |
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| Duration | March 18 – March 24 |
|---|---|
| Peak intensity | 55 km/h (35 mph) (10-min) 1000 hPa (mbar) |
| Typhoon (JMA) | |
| Category 4 super typhoon (SSHWS) | |
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| Duration | April 4 – April 16 |
|---|---|
| Peak intensity | 165 km/h (105 mph) (10-min) 940 hPa (mbar) |
| Typhoon (JMA) | |
| Category 5 super typhoon (SSHWS) | |
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| Duration | May 13 – May 21 |
|---|---|
| Peak intensity | 175 km/h (110 mph) (10-min) 935 hPa (mbar) |
| Tropical depression (JMA) | |
| Tropical storm (SSHWS) | |
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| Duration | May 14 – May 20 |
|---|---|
| Peak intensity | 55 km/h (35 mph) (10-min) 1004 hPa (mbar) |
| Severe tropical storm (JMA) | |
| Tropical storm (SSHWS) | |
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| Duration | May 16 – May 22 |
|---|---|
| Peak intensity | 95 km/h (60 mph) (10-min) 985 hPa (mbar) |
| Typhoon (JMA) | |
| Category 3 typhoon (SSHWS) | |
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| Duration | June 4 – June 11 |
|---|---|
| Peak intensity | 150 km/h (90 mph) (10-min) 960 hPa (mbar) |
| Severe tropical storm (JMA) | |
| Category 1 typhoon (SSHWS) | |
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| Duration | June 7 – June 15 |
|---|---|
| Peak intensity | 110 km/h (70 mph) (10-min) 975 hPa (mbar) |
| Typhoon (JMA) | |
| Category 5 super typhoon (SSHWS) | |
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| Duration | June 11 – June 21 |
|---|---|
| Peak intensity | 185 km/h (115 mph) (10-min) 915 hPa (mbar) |
The 2004 Pacific typhoon season was a very active season; it ran year-round in 2004, but most tropical cyclones tend to form in the northwestern Pacific Ocean between May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.
The scope of this article is limited to the Pacific Ocean, north of the equator and west of the international date line. Storms that form east of the date line and north of the equator are called hurricanes; see 2004 Pacific hurricane season. Tropical Storms formed in the entire west pacific basin are assigned a name by the Tokyo Typhoon Center. Tropical depressions in this basin have the "W" suffix added to their number. Tropical depressions that enter or form in the Philippine area of responsibility are assigned a name by the Philippine Atmospheric, Geophysical and Astronomical Services Administration or PAGASA. This can often result in the same storm having two names.
The 2004 season was a very active season. 29 storms were named in this year and 19 of them reached typhoon intensity. The accumulated cyclone energy (ACE) index of this season amounted to 60% above the normal level for Pacific typhoon seasons, at 464. This makes 2004 season the third most active season in recorded history, only after 1997 and 1992.
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 shear. On February 13 and 14, the depression executed a clockwise loop. When the storm turned to the southwest, the vertical wind shear overcame it, and the storm 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.
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.
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