The 2004 Atlantic hurricane season was a very deadly, destructive, and extremely active Atlantic hurricane season, with over 3,200 deaths and more than $61 billion in damage. More than half of the 16 tropical cyclones brushed or struck the United States. Due to the development of a Modoki El Niño – a rare type of El Niño in which unfavorable conditions are produced over the eastern Pacific instead of the Atlantic basin due to warmer sea surface temperatures farther west along the equatorial Pacific – activity was above average. The season officially began on June 1 and ended on November 30, though the season's last storm, Otto, dissipated on December 3, extending the season beyond its traditional boundaries. The first storm, Alex, developed offshore of the Southeastern United States on July 31, one of the latest dates on record to see the formation of the first system in an Atlantic hurricane season. It brushed the Carolinas and the Mid-Atlantic, causing one death and $7.5 million (2004 USD) in damage. Several storms caused only minor damage, including tropical storms Bonnie, Earl, Hermine, and Matthew. In addition, hurricanes Danielle, Karl, and Lisa, Tropical Depression Ten, Subtropical Storm Nicole and Tropical Storm Otto had no effect on land while tropical cyclones. The season was the first to exceed 200 units in accumulated cyclone energy (ACE) since 1995, mostly from Hurricane Ivan, the storm produced the highest ACE. Ivan generated the second-highest ACE in the Atlantic, only behind 1899 San Ciriaco Hurricane.
Hurricane Jeanne was a Category 3 hurricane that struck the Caribbean and the Eastern United States in September 2004. It was the deadliest hurricane in the Atlantic basin since Mitch in 1998. It was the tenth named storm, the seventh hurricane, and the fifth major hurricane of the season, as well as the third hurricane and fourth named storm of the season to make landfall in Florida. After wreaking havoc on Hispaniola, Jeanne struggled to reorganize, eventually strengthening and performing a complete loop over the open Atlantic. It headed westwards, strengthening into a Category 3 hurricane and passing over the islands of Great Abaco and Grand Bahama in the Bahamas on September 25. Jeanne made landfall later in the day in Florida just two miles from where Hurricane Frances had struck a mere three weeks earlier.
Hurricane Jeanne was a moderate hurricane that formed and dissipated in the Gulf of Mexico without making landfall, only one of four occurrences in the 20th century. The thirteenth tropical cyclone, tenth named storm, and eighth hurricane of the 1980 Atlantic hurricane season, Jeanne developed over the southern Caribbean on November 7. It moved swiftly northward, and it intensified to a tropical storm on November 9. It entered the southern Gulf of Mexico on November 10. Jeanne turned to the west on November 11, and it rapidly intensified to its peak intensity of 100 mph (160 km/h). It weakened on November 12, and its forward motion slowed; the cyclone weakened further to a tropical storm because of dry air intrusion, and it executed a clockwise loop on November 15. It dissipated on November 16.
The meteorological history of Hurricane Jeanne lasted for about two weeks in September 2004. Hurricane Jeanne was the eleventh tropical cyclone, tenth named storm, seventh hurricane, and sixth major hurricane of the 2004 Atlantic hurricane season. It formed from a tropical wave on September 13 near the Lesser Antilles, and encountered favorable enough conditions to reach tropical storm status. Jeanne strengthened further in the eastern Caribbean, becoming a strong tropical storm and developing an eye before striking Puerto Rico on September 15. Remaining well-organized, it attained hurricane status before hitting the eastern tip of the Dominican Republic on September 16.
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, despite only amounting to 15 named systems, was the basin's most active season since 1996. Conversely, both the Eastern Pacific hurricane and North Indian Ocean cyclone seasons experienced the fewest cyclones reaching tropical storm intensity in recorded history, 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.
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