 | This article needs additional citations for verification. (September 2020) |
| This article relies largely or entirely on a single source. (May 2024) |
| Tropical cyclones in 2004 | |
|---|---|
 Year summary map | |
| Year boundaries | |
| First system | Ken |
| Formed | January 1, 2004 |
| Last system | Raymond |
| Dissipated | January 10, 2005 |
| Strongest system | |
| Name | Gafilo |
| Lowest pressure | 895 mbar (hPa); 26.43 inHg |
| Longest lasting system | |
| Name | Ivan |
| Duration | 22 days |
| Year statistics | |
| Total systems | 130 |
| Named systems | 80 |
| Total fatalities | 6,609 (97) |
| Total damage | $80.672 billion (2004 USD) |
Among them, Gafilo (center image in the first row) was the most intense, with a minimum central pressure of 895 hPa.
During 2004, 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 132 systems formed with 82 of these developing further and were named by the responsible warning centre. The strongest tropical cyclone of the year was Cyclone Gafilo, which was estimated to have a minimum barometric pressure of 895 hPa (26.43 inHg). The most active basin in the year was the Western Pacific, which documented 29 named systems, while the North Atlantic 15 named systems formed. Conversely, both the Eastern Pacific hurricane and North Indian Ocean cyclone seasons experienced a below average number of named systems, numbering 12 and 4, respectively. Activity across the southern hemisphere's three basins—South-West Indian, Australian, and South Pacific—was spread evenly, with each region recording seven named storms apiece. Throughout the year, 28 Category 3 tropical cyclones formed, including seven Category 5 tropical cyclones formed in the year. The accumulated cyclone energy (ACE) index for the 2004 (seven basins combined), as calculated by Colorado State University was 1024.4 units.
The costliest tropical cyclone was Hurricane Ivan, which struck Caribbean and United States in September causing a tornado outbreak, with US$26.1 billion in damage. The deadliest tropical cyclone of the year was Hurricane Jeanne who killed for at least 3,006 deaths in Haiti.