1961 Atlantic Hurricane Season

The 1961 Atlantic hurricane season was a hyperactive Atlantic hurricane season, with an accumulated cyclone energy (ACE) total of 189. The season, however, was an average one in terms of named storms. The season featured eight hurricanes and a well above average number of five major hurricanes. It was previously thought that the season had a record-tying seven major hurricanes, before the Atlantic hurricane reanalysis project downgraded two storms in 2019. Two Category 5 hurricanes were seen in 1961, making it one of only seven Atlantic hurricane seasons to feature multiple Category 5 hurricanes in one season. The season started on June 15, and ended on November 15. These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin. The first system, an operationally unclassified tropical depression, formed offshore east Central Florida on June 10, but dissipated a few days later. Next, Hurricane Anna developed in the eastern Caribbean Sea near the Windward Islands on July 20. It brought minor damage to the islands, as well as wind and flood impacts to Central America after striking Belize as a hurricane. Anna caused one death and about $300,000 (1961 USD) in damage. Activity went dormant for nearly a month and a half, until Hurricane Betsy developed on September 2. Betsy peaked as a Category 4 hurricane, but remained at sea and caused no impact.

One of the most significant storms of the season was Hurricane Carla, which peaked as a Category 4 hurricane, before striking Texas. Carla caused 43 deaths and approximately $325.74 million in damage. Hurricane Debbie was a Category 1 storm that existed in the eastern Atlantic Ocean. Early in its duration, unsettled weather from Debbie in Cape Verde resulted in a plane crash that killed 60 people. The extratropical remnants of Debbie then brushed Ireland, causing severe damage over the British Isles. The next storm, Hurricane Esther, threatened to strike New England as a major hurricane, but rapidly weakened and made landfall in Massachusetts as only a tropical storm. Impact was generally minor, with about $6 million in damage and seven deaths, all of which from a United States Navy plane crash. An unnamed tropical storm and Hurricane Frances caused minimal impact on land. In mid-October, Tropical Storm Gerda brought flooding to Jamaica and eastern Cuba, resulting in twelve deaths.

Another significant storm was Hurricane Hattie, a late-season Category 5 hurricane that struck Belize. Hattie caused 319 confirmed fatalities and about $60.3 million in damage. Destruction was so severe in Belize that the government had to relocate inland to a new city, Belmopan. In early November, the depression that would later strengthen into Hurricane Jenny brought light rainfall to Puerto Rico. The final storm, Tropical Storm Inga, dissipated on November 8, after causing no impact on land. On September 11, three hurricanes existed simultaneously – Betsy, Carla, and Debbie – the most on a single day in the Atlantic basin since 1893 and until 1998. Collectively, the storms of the 1961 Atlantic hurricane season caused about $392.34 million in damage and at least 437 fatalities.

Season summary

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The Atlantic hurricane season officially began on June 15. It was an above average season in which twelve tropical storms formed; this was above the 1950–2000 average of 9.6 named storms. Eight of these reached hurricane status, also above of the 1950–2000 average of 5.9. Furthermore, five storms reached major hurricane status. It was originally believed that the season had seven major hurricanes, though later analysis resulted in a downgrade of two storms. Of the five major hurricanes, two became Category 5 hurricanes. Four hurricanes and two tropical storms made landfall during the season, causing 348 deaths and $391.6 million in damage. Hurricane Debbie also caused damage and deaths, despite remaining offshore and then after becoming extratropical.

Tropical cyclogenesis began with an initially unclassified tropical depression, which developed on June 10. More than a month later, Hurricane Anna formed on July 17 and dissipated on July 24. Thereafter, no other systems developed in July or the month of August. A lack of cyclonic activity in the Atlantic basin in August is rare, with such phenomenon not occurring again until the 1997 and 2022 seasons . The Atlantic basin remained dormant until Hurricane Betsy developed on September 2. During the next four days, two other tropical cyclones formed – Carla and Debbie. On September 11, the three storms – Betsy, Carla, and Debbie – existed simultaneously as hurricanes, the most in a single day since 1893 and until 1998. Esther, which developed on September 10, did not reach hurricane status until September 12. Later that day, a tropical storm that went unnamed formed over the Bahamas and moved across the East Coast of the United States for its brief duration.

After Debbie became extratropical on September 14, another tropical cyclone developed over two weeks later, Hurricane Frances. Thereafter, tropical cyclogenesis slowed in October, which featured only three systems, a second previously unclassified tropical depression, Gerda, and Hattie. The latter was the strongest tropical cyclone of the season, peaking with maximum sustained winds of 165 mph (270 km/h) and a minimum barometric pressure of . After weakening slightly, Hattie struck Belize on October 31, before dissipating on November 1. Later that day, Hurricane Jenny developed northeast of Antigua. Jenny remained weak for much of its duration and became extratropical on November 8. The final system, Tropical Storm Inga, formed in the Gulf of Mexico on November 4. Four days later, Inga dissipated, one week before the season officially ended.

The season's activity was reflected with an accumulated cyclone energy (ACE) rating of 189, one of the highest values recorded. ACE is, broadly speaking, a measure of the power of the hurricane multiplied by the length of time it existed, so storms that last a long time, as well as particularly strong hurricanes, have high ACEs. It is only calculated for full advisories on tropical systems at or exceeding , which is the threshold for tropical storm strength.

Systems

Hurricane Anna

A tropical wave that emerged into the Atlantic from the west coast of Africa around mid-July developed about northeast of Cayenne, French Guiana, late on July 17. The depression moved west-northwestward and by the following day, it intensified into a Tropical Storm Anna. After passing just south of Grenada early on July 20, Anna entered the Caribbean Sea. Favorable environmental conditions allowed Anna to reach hurricane intensity late on July 20. The cyclone continued to slowly intensifying, reaching Category 2 intensity on July 22 and peaking with maximum sustained winds of 105 mph (165 km/h). However, the storm weakened slightly before making landfall as a Category 1 hurricane in Honduras near Barra Patuca, Gracias a Dios Department, with winds of 80 mph (130 km/h). After re-emerging into the Caribbean, Anna weakened slightly further, striking Utila around 01:00 UTC on July 24 with winds of 75 mph (120 km/h). About nine hours later, the hurricane made landfall in Belize near Monkey River Town at the same intensity. Anna rapidly weakened over land and dissipated late on July 24.

As a developing tropical cyclone over the Windward Islands, Anna produced strong winds on Grenada, though damage was limited to some crops, trees, and telephone poles. Other islands experienced gusty winds, but no damage. Passing just north of Venezuela, the hurricane produced strong winds over the country, peaking as high as . Strong winds caused widespread damage in northern Honduras. Throughout the country, at least 36 homes were destroyed and 228 were damaged. Severe damage in the Gracias a Dios Department left hundreds of people homeless. Additionally, high winds toppled approximately 10,000 coconut trees. Overall, Anna caused one fatality and $300,000 in damage, primarily in Central America.

Hurricane Betsy

In early September, a tropical wave was noted in the Intertropical Convergence Zone (ITCZ). On September 2, the disturbance was analyzed to have attained tropical storm strength, after nearby ship reports indicated strong winds associated with anomalously low barometric pressures. Moving steadily northwestward, favorable conditions allowed Betsy to quickly intensify later that day. Shortly after, a trough situated along 50°W steered Betsy to a more northerly course. Another low-pressure area later formed in the trough, perturbing the ridge to the north of Betsy for much of its initial stages, causing the hurricane's central pressure to rise, despite an increase in sustained winds. However, on September 5, a shortwave forced the low northeastward, allowing for Betsy to strengthen further.

Early on September 6, Betsy attained Category 4 hurricane strength, peaking with maximum sustained winds of 130 mph (215 km/h) and a central pressure of 945 mbar (hPa; 27.91 inHg), based on reconnaissance flights into the system. However, as a result of missing the short wave itself, the hurricane later weakened and fell to Category 3 intensity while located about east-northeast of Bermuda. Betsy weakened further to Category 2 hurricane before becoming nearly stationary beginning on September 6. Moving into higher latitudes, Betsy began to weaken, degenerating back to Category 1 hurricane intensity on late on September 8. A separate, minor trough was later able to move the system northeastwards by the following day. Betsy re-intensified into a Category 2 hurricane early on September 10, but transitioned into extratropical cyclone several hours later. The extratropical remnants continued northeastward and weakened, before executing a large loop over the far north Atlantic. The remnants dissipated well north of the Azores on September 16.

Hurricane Carla

A tropical depression developed from an area of squally weather embedded within the ITCZ in the southwestern Caribbean Sea on September 3. Initially a tropical depression, it strengthened slowly while heading northwestward, and by September 4, the system was upgraded to Tropical Storm Carla. About 24 hours later, Carla was upgraded to a hurricane. Shortly thereafter, the storm curved northward while approaching the Yucatán Channel. Late on September 7, Carla entered the Gulf of Mexico while passing just northeast of the Yucatán Peninsula. The cyclone reached major hurricane intensity around 12:00 UTC on the next day. Resuming its northwestward course, Carla continued intensification and on September 11, it peaked as a Category 4 hurricane. Carla made landfall near Port O'Connor, Texas, with winds of 145 mph (230 km/h). It weakened quickly inland and was reduced to a tropical storm on September 12. Heading generally northward, Carla transitioned into an extratropical cyclone on September 13, while centered over southern Oklahoma. However, the remnants continued generally northeastward and entered Canada on September 14, before dissipating near Cape Chidley early on September 16.

While crossing the Yucatán Channel, the outer bands