The 1974 Atlantic hurricane season was a destructive and deadly hurricane season. In terms of overall activity, it was average, with thirteen named storms forming, of which four became hurricanes. Two of the four became major hurricanes, which are Category 3 or higher systems on the Saffir–Simpson scale. The season officially began on June 1 and lasted until November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic Ocean.
The first system, an unnamed tropical storm, developed over the Bay of Campeche on June 22 and dissipated by June 26. The most intense storm of the season was Hurricane Carmen, which struck the Yucatán Peninsula at Category 4 intensity and Louisiana at Category 3 intensity. Carmen caused about $162 million in damage, mostly in Louisiana, and 12 deaths. Also highly notable was Hurricane Fifi, the deadliest Atlantic hurricane since the 1900 Galveston hurricane, which dropped torrential rain in Central America, especially Honduras. The hurricane left more than $1.8 billion in damage and at least 8,210 fatalities. In August, poor weather conditions produced by Tropical Storm Alma caused a plane crash in Venezuela, which killed 49 people. Alma caused two additional deaths in Trinidad. Collectively, the tropical cyclones of this year resulted in at least 8,277 deaths and just under $2 billion in damage.
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Season summary
The hurricane season officially began on June 1, with the first tropical cyclone developing on June 22. A total of 16 tropical and subtropical cyclones formed, with 13 of them intensifying into nameable storm systems. This was above the 1950–2000 average of 9.6 named storms. Four of these reached hurricane status, below the 1950–2000 average of 5.9. Furthermore, two storms reached major hurricane status; near the 1950–2000 average of 2.3. Collectively, the cyclones of this season caused at least 8,277 deaths and just under $2 billion in damage.
The Atlantic hurricane season officially ended on November 30, with the final cyclone dissipating on November 12.
Similar to the previous two seasons, much of the tropics were dominated by extensive upper-level westerlies and colder than normal sea surface temperatures, producing unfavorable conditions, though to a lesser extent than in 1972 and 1973. Wind shear generated by the westerlies covered a smaller area, while sea surface temperatures in the tropics were generally above the threshold for tropical cyclogenesis. All named storms developed in regions with ocean temperatures exceeding .
Tropical cyclogenesis began in June, with an unnamed tropical storm developing over the Bay of Campeche on June 22. Two cyclones formed in July – an unnamed tropical storm followed by a tropical depression. August featured five systems, including Alma, Becky, Carmen, a subtropical storm, and a tropical depression. September tied August as the most active month, with Dolly, Elaine, Fifi, Gertrude, and a tropical depression forming. Subtropical Storm Four and an unnumbered subtropical storm developed in October. The unnumbered subtropical storm would be the season's final system, when it dissipated on October 20.
The season's activity was reflected with an accumulated cyclone energy (ACE) rating of 61. ACE is a metric used to express the energy used by a tropical cyclone during its lifetime. Therefore, a storm with a longer duration will have high values of ACE. It is only calculated at six-hour increments in which specific tropical and subtropical systems are either at or above sustained wind speeds of 39 mph (63 km/h), which is the threshold for tropical storm intensity.
Systems Unnamed June tropical storm
A low-pressure formed over the Bay of Campeche near Veracruz by June 1. Although a reconnaissance aircraft flight failed to locate a closed circulation early on June 22, surface observations in Mexico showed evidence of a circulation later that day. A tropical depression was estimated to have formed at 12:00 UTC on June 22 while situated just offshore Montepío, Veracruz. Initially, the depression moved northeastward and appeared well-organized. However, by the following day, convection associated with the depression began weakening after an upper low pressure trough intensified over the eastern United States. Convection flared over the eastern Gulf of Mexico, but a second circulation had developed by June 24, with that system formerly listed as a subtropical storm; however, reanalysis removed it from HURDAT in 2026.
The depression, now moving slowly northeastward, redeveloped well-organized convection by June 25. However, shortly thereafter, the depression began to lose tropical characteristics due to interaction with atmospheric trough of low pressure. By June 26, the depression completed its extratropical transition over the eastern Gulf of Mexico. The remnants of the depression accelerated to the northeast and moved across Florida, before moving along the East Coast of the United States and then dissipating over New England by June 30. The remnants of the depression brought mostly light rainfall to East Coast states, but prtions of Florida experienced heavy precipitation, particularly the Tampa Bay area. A peak rainfall total of was observed at the St. Pete–Clearwater International Airport. Farther inland, Avon Park measured . The storm brought flooding and erosion to parts of west Central Florida. Overall, approximately $24.8 million in damage occurred in Florida, with roughly half of that total incurred to beaches, bridges, drainage systems, roads, sewers, and utilities. Three deaths were reported in the state, all due to drowning.
Unnamed July tropical storm
A convective area of cloudiness existed northeast of the Bahamas in mid July in response to a stationary frontal boundary. On July 15, satellite imagery suggested the presence of a weak circulation within the system. Around 00:00 UTC on the following day, a subtropical depression formed about northeast of the Bahamas. Moving northeastward, the cyclone slowly strengthened, becoming a subtropical storm at about 12:00 UTC on July 17. Late on the next day, the ship Export Adventurer observed winds of and a barometric pressure of . Based on these observations, the storm peaked with maximum sustained winds of 50 mph (85 km/h) on July 18. By the next day, the cyclone began weakening. Around 00:00 UTC on July 20, the subtropical storm was absorbed a large extratropical low, which dissipated well east of Newfoundland several hours later.
Subtropical Storm Three
A frontal wave formed along a stationary front which ended from near Cape Hatteras northeastward. At 12:00 UTC on August 10, a subtropical storm developed between Bermuda and New England. The storm moved southeastward and then northeastward, before turning northward early on August 12. Drifting northward, the cyclone continued to intensify. Around 12:00 UTC on August 14, the system peaked with maximum sustained winds of 65 mph (100 km/h) and a minimum barometric pressure of , based on ship observations. Later that day, the cyclone curved east-northeastward and accelerated, while its circulation became increasingly ill-defined, resembling that of a front, near Sable Island at about 00:00 UTC on August 15. The remnants of the storm were last noted passing over Cape Race several hours later.
Tropical Storm Alma
A vigorous tropical wave emerged off the western coast of Africa on August 9, developing into a tropical depression by 12:00 UTC on August 12 while located about 545 mi (875 km) east-southeast of Barbados. Steered rapidly west by an abnormally strong subtropical ridge, the depression intensified into Tropical Storm Alma by noon UTC the next day. Six hours later, Alma attained peak winds of 65 mph (100 km/h) in accordance with data from a reconnaissance aircraft. Early on August 14, Alma made landfall in Trinidad as a minimal tropical storm, becoming the southernmost-landfalling system on the island in 41 years. The system's circulation entered Venezuela and interacted with mountainous terrain, where it dissipated by 12:00 UTC on August 15.
The storm produced a wind gust as high as on Trinidad at Savonetta. Alma left heavy damage in Trinidad, amounting to approximately $5 million, making it the most destructive cyclone of the 20th century on the island at that time. The storm damaged about 5,000 buildings, leaving roughly 500 people homeless. Additionally, the cyclone ruined about 17,750 acres (7,180 ha) of crop fields. Two fatalities occurred in Trinidad, including one person who was struck by flying debris. Alma's heavy rainfall was responsible for a plane crash on Isla Margarita off the Venezuelan coast, killing the 49 people on board.
Tropical Depression Five
Around 12:00 UTC on August 24, a tropical depression developed in the southeastern Gulf of Mexico. Moving northwestward, the depression organized further, peaking with maximum sustained winds of 35 mph (55 km/h). It was on the verge of attaining tropical storm status, but made landfall in Texas between Galveston and Freeport on August 26. The depression promptly dissipated.
The depression produced heavy rainfall in Texas, especially in the central parts of the state, with a peak total of in Burnet. A weak cold front, combined with the depression, brought flooding portions of Texas, especially Bell County. In Killeen and Harker Heights, more than 100 people fled their homes, as well as about 50 people from a mobile home park in Nolanville. Flooding damaged 47 homes, 37 mobile homes, and a number of cars. Damage in Bell County was estimated at $100,000. A pickup truck was swept off a low-water crossing at Fort Hood, drowning one occupant of the vehicle. The depression and its remnants also produced rainfall in Arkansas, Kansas, Louisiana, Mississippi, Missouri, and Oklahoma.
Hurricane Becky
The National Hurricane Center first began monitoring an area of shower and thunderstorm activity northeast of the Leeward Islands on August 20. After five days, a circulation became visible on satellite imagery. The disturbance tracked northwest, and both ships observations and satellite imagery indicated the formation of a tropical depression by 12:00 UTC on August 26; at the time, it was centered about 440 mi (710 km) south-southwest of Bermuda. Following designation, the depression curved north and then northeast as it rounded the western periphery of a ridge near the Azores. A light shear environment allowed it to intensify into Tropical Storm Becky by 06:00 UTC on August 28 and further into a hurricane by 18:00 UTC that day.
Around 12:00 UTC on August 29, Becky intensified into a Category 2 hurricane. Early on August 31, the system intensified into a Category 3, and by 12:00 UTC, the storm attained its peak intensity as a Category 4 hurricane with maximum sustained winds of 130 mph (215 km/h), based on earlier observations by a reconnaissance aircraft and satellite observations, despite being near 40°N latitude. Thereafter, Becky accelerated eastward and weakened, falling to tropical storm intensity early on September 2. Later that day, the cyclone merged with a frontal zone northwest of the Azores. Although Becky never posed a threat to land, the storm crossed several major shipping routes.
Hurricane Carmen