The 2005 Atlantic hurricane season was a record-breaking, catastrophic, and deadly Atlantic hurricane season. It is the second-costliest hurricane season, just behind the 2017 season. It featured 28 tropical and subtropical storms, which was previously the most recorded in a hurricane season until the 2020 season. The United States National Hurricane Center named 27 storms, exhausting the annual pre-designated list, requiring the use of six Greek letter names, and adding an additional unnamed subtropical storm during a post-season re-analysis. A record 15 storms attained hurricane status, with maximum sustained winds of at least . Of those, a record seven became major hurricanes, rated Category 3 or higher on the Saffir–Simpson scale. Four storms of this season became Category 5 hurricanes, the most of any season on record.
The four Category 5 hurricanes during the season were Emily, Katrina, Rita, and Wilma. In July, Emily reached peak intensity in the Caribbean Sea, becoming the first Category 5 hurricane of the season, later weakening and striking Mexico twice. It was the first Category 5 hurricane recorded in the month of July and was the earliest-forming Category 5 hurricane on record, until Hurricane Beryl surpassed the record in July 2024. In August, Katrina reached peak winds in the Gulf of Mexico but weakened by the time it struck the U.S. states of Louisiana and Mississippi. The most devastating effects of the season were felt on the Gulf Coast of the United States, where Katrina's storm surge crippled New Orleans, Louisiana, for weeks and devastated the Mississippi coastline. Katrina became the costliest U.S. hurricane, leaving $125 billion in damage and 1,392 deaths. Rita followed in September, reaching peak intensity in the Gulf of Mexico before weakening and hitting near the border of Texas and Louisiana. The season's strongest hurricane, Wilma, became the most intense Atlantic hurricane on record, as measured by barometric pressure. Lasting for ten days in October, Wilma moved over Cozumel, the Yucatán Peninsula, and Florida, causing over $22 billion in damage and 52 deaths.
The season's impact was widespread and catastrophic. Its storms caused an estimated 3,468 deaths and approximately $171.7 billion in damage. It was the costliest season on record at the time, until its record was surpassed 12 years later. It also produced the second-highest accumulated cyclone energy (ACE) in the Atlantic basin, only behind the 1933 season. The season officially began on June 1, 2005, and the first storm, Arlene, developed on June 8. Hurricane Dennis in July inflicted heavy damage to Cuba. Hurricane Stan in October was part of a broader weather system that killed 1,673 people and caused $3.96 billion in damage to eastern Mexico and Central America, with Guatemala hit the hardest. The final storm, Zeta, formed in late December and lasted until January 6, 2006, the latest of any season, tied with 1954.
Seasonal forecasts +Predictions of tropical activity in the 2005 seasonSourceDateNamedstormsHurricanesMajorhurricanesRefAverage (1950–2004) 10.0 6.0 2.6 CSU December 3, 2004 11 6 3 TSR December 10, 2004 9.6 5.7 3.3 TSR January 5, 2005 13.9 7.8 3.6 TSR February 9, 2005 13.6 7.7 3.5 TSR March 7, 2005 14.0 7.9 3.6 CSU April 1, 2005 13 7 3 TSR April 5, 2005 13.9 7.8 3.6 InsMet May 2, 2005 13 7 N/A TSR May 5, 2005 13.9 7.8 3.6 NOAA May 16, 2005 12–15 7–9 3–5 CSU May 31, 2005 15 8 4 TSR June 7, 2005 13.8 7.8 3.5 TSR July 7, 2005 15.3 8.8 4.1 InsMet August 1, 2005 20 9 N/A NOAA August 2, 2005 18–21 9–11 5–7 TSR August 5, 2005 22.1 11.4 7.8 CSU August 5, 2005 20 10 6 CSU September 2, 2005 20 10 6 CSU October 3, 2005 20 11 6 Actual activity 28 15 7 Ahead of the formal start of the season, various groups issued forecasts for the number of named storms, hurricanes, and major hurricanes in the upcoming season, including Colorado State University (CSU), the Cuban Institute of Meteorology (InsMet), Tropical Storm Risk (TSR), and the United States National Oceanic and Atmospheric Administration (NOAA). Some forecasts predicted how many tropical cyclones would affect a particular country or territory.
Pre-season forecasts The first of these forecasts was issued by CSU, which predicted on December 5, 2004 that the season would be above average and feature 11 named storms, 6 hurricanes and 3 intense hurricanes. They also noted that the Caribbean and the entire United States coastline faced an increased risk of a major hurricane making landfall. TSR issued its first forecast a few days later and predicted that the season would feature 9.6 tropical storms, 5.7 hurricanes, 3.3 major hurricanes, and predicted that the accumulated cyclone energy (ACE) rating would be 145.
During January 2005, TSR increased its forecast to 13.9 tropical storms, 7.8 hurricanes, 3.6 major hurricanes, and predicted that the ACE rating would be 157. CSU issued its first updated forecast on April 1, increasing their prediction to 13 tropical storms, 7 hurricanes, and 3 major hurricanes, with a continued risk of a major hurricane landfall in the Caribbean or United States. The increase was based on the Atlantic continuing to warm and a strong belief that El Niño conditions would not persist into the hurricane season. On May 2, the Cuban Institute of Meteorology (InsMet) issued their seasonal forecast, which predicted that the season would feature 13 tropical storms and 7 hurricanes. This was followed on May 16 by NOAA, who predicted a 70% chance of above normal activity, with 12–15 tropical storms, 7–9 hurricanes, and 3–5 major hurricanes. The agency cited favorable conditions associated with an active phase of the Atlantic multidecadal oscillation (AMO). CSU issued its second forecast update on May 31, revising its forecast to 15 named storms, 8 hurricanes and 4 major hurricanes; by this point, the group believed El Niño conditions were unlikely.
Midseason outlooks In their July forecast update, TSR anticipated that the season would be exceptionally active and well above average; the group increased their forecast to 15.3 tropical storms, 8.8 hurricanes, and 4.1 major hurricanes, with an ACE rating of 190. By the end of July, seven tropical storms and two major hurricanes had developed within the basin, which prompted CSU, InsMet, NOAA and TSR to significantly increase their seasonal forecasts at the start of August. In their August 5 update, CSU predicted that 13 more storms would form, with seven more hurricanes and three more major hurricanes. At the start of September, CSU updated their forecasts and predicted that eight more storms would form, with six more hurricanes and three major hurricanes. By the end of September, 17 named storms had developed, of which nine had developed into hurricanes and four had become major hurricanes. Within their final update for the year, CSU predicted that October would feature three named storms, two hurricanes and one major hurricane.
Seasonal summary
With 28 storms (27 named storms and one unnamed), the 2005 Atlantic hurricane season set a new single-year record for most storms, surpassing the total of 20 from 1933. This record stood until surpassed by the 2020 season, which had 30 storms, making it the second-most active season on record . Before August 1, a record seven named storms formed, surpassing 1997, and later eclipsed by 2020. Further, the months of July and November set records for number of named storms, with 5 and 3, respectively. The 2005 season featured 15 hurricanes, surpassing the previous record of 12, set in 1969. Of the 15 hurricanes, 5 formed in September, with the season becoming only the sixth to feature 5 in that month. The 2005 season also featured a record seven major hurricanes, one more than the previous record, set in 1926, 1933, 1950, 1996, and 2004. The four Category 5 hurricanes were also a record. The season's activity was reflected with an ACE rating of 244, the second-highest value on record in the Atlantic basin, after the 1933 season. The storms of the season were extraordinarily damaging and were responsible for significant loss of life. Total damage is estimated to be about US$171.7 billion, and the seasons' storms contributed to the deaths of 3,912 people. There were a record 15 storms making landfall, including seven storms that struck the United States.
Meteorological conditions
The extremely active 2005 hurricane season was a continuation of an extended sequence of active years for tropical activity in the Atlantic. Tropical cyclone activity in the Atlantic Ocean between 1995 and 2004 was more active than any other decade in reliable record. With the exception of two years in which El Niño conditions were prevalent (1997 and 2002), all hurricane seasons since 1995 were individually above average. This was associated with an active phase of the Atlantic multidecadal oscillation (AMO), with a similar period of elevated tropical activity occurring between 1950 and 1969. The anomalously frequent formation of tropical storms and hurricanes reflected the emergence of unusually warm sea surface temperatures across the tropical Atlantic.
Chylek and Lesins (2008) determined that the likelihood of a season generating as much tropical activity as 2005 was less than 1 percent. The consecutive occurrence of hurricane seasons as active as 2004 and 2005 in the Atlantic was unprecedented. While environmental conditions favorable for the development of tropical cyclones were analogous to other active seasons, they were more pronounced and encompassed larger areas in 2005. The CPC determined that this environmental enhancement was primarily driven by four factors: the Atlantic multidecadal oscillation, the reduction of atmospheric convection in the tropical Pacific, record-high sea surface temperatures in the tropical Atlantic and Caribbean, and conducive wind and pressure patterns across the western Caribbean and Gulf of Mexico. The multidecadal oscillation increased the potency of conducive environmental factors for tropical development, including the increased strength of subtropical ridges in the northern and southern Atlantic and the eastern Pacific. This amplified the African easterly jet and enhanced upper-level easterlies, attenuating wind shear detrimental to tropical cyclogenesis across the central tropical Atlantic and the Caribbean. Frequent lulls in convection over the tropical Pacific also contributed to the strength of these ridges, focusing hurricane activity in the Atlantic. Most of the tropical storms and all major hurricanes in the Atlantic in 2005 formed when a lack of convection was present near the International Dateline, while a brief uptick in storms near the International Dateline led to a lull in tropical cyclogenesis in the Atlantic for the first half of August.