The 1960 Atlantic hurricane season marked the beginning of the satellite era in hurricane tracking with the launch of TIROS-1, the first satellite with the sole purpose of detecting cloud formations, but was the least active season since 1952. The season officially began on June 15, and lasted until November 15. These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin. The first system, an unnamed storm, developed in the Bay of Campeche on June 22. It brought severe local flooding to southeastern Texas and was considered the worst disaster in some towns since a Hurricane in 1945. The unnamed storm moved across the United States for almost a week before dissipating on June 29. In July, Hurricane Abby resulted in minor damage in the Leeward Islands, before impacting a few Central American counties — the remnants of the storm would go on to form Hurricane Celeste in the East Pacific. Later that month, Tropical Storm Brenda caused flooding across much of the East Coast of the United States. The next storm, Hurricane Cleo, caused no known impact, despite its close proximity to land.
The most significant storm of the season was Hurricane Donna, which at the time was among the ten costliest United States hurricanes. After the precursor caused a deadly plane crash in Senegal, the storm itself brought severe flooding and wind impacts to the Lesser Antilles and Florida, where Donna made landfall as a Category 4 hurricane. It moved northeast and struck North Carolina and Long Island, New York, while still at hurricane intensity. Donna caused at least 428 fatalities and $980 million (1960 USD) in damage. Hurricane Ethel reached Category 3 intensity, but rapidly weakened before making landfall in Mississippi, resulting in only 1 fatality and $1.5 million in losses. The final storm, Florence, developed on September 17. It remained weakened and moved erratically over Cuba and Florida. Only minor flooding was reported. Collectively, the tropical cyclones in 1960 caused at least 454 deaths and about $990.74 million in damage.
Season summary
The Atlantic hurricane season officially began on June 15, 1960. It was a below-average season in which seven tropical depressions formed. All seven of the depressions attained tropical storm status, which was below the 1950–2000 average of 9.6 named storms. Four of these reached hurricane status, also falling short of the 1950–2000 average of 5.9. Furthermore, two storms reached major hurricane status, which is Category 3 or higher on the Saffir–Simpson hurricane wind scale. Two hurricane and four tropical storms made landfall during the season and caused 454 deaths and $410.74 million (1960 USD) in damage.
Season activity began on June 23, with the development of an unnamed tropical storm. Tropical cyclogenesis resumed in July with Hurricane Abby between July 10 and July 16, followed by Tropical Storm Brenda from July 28 to July 31. In mid-August, Hurricane Cleo developed and had an uneventful duration. At the end of that month, Hurricane Donna formed and lasted into mid-September; it was the strongest tropical cyclone of the season, peaking as a Category 4 hurricane. There was a Category 3 hurricane in September, Ethel, which briefly existed in the Gulf of Mexico. The last storm of the season, Tropical Storm Florence, dissipated on September 25, over a month before the official end of the season on November 15.
The season's activity was reflected with an accumulated cyclone energy (ACE) rating of 73 units, the lowest value since 1956. 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 or tropical storm strength.
Systems
June tropical storm
Observations from a reconnaissance flight on June 22 indicated that a large area of showers and thunderstorms in the Gulf of Mexico was producing winds up to . Because no circulation was reported, it was operationally classified as a tropical low, though radar stations along the Gulf Coast of Mexico indicated a circulation. Thus, the system became a tropical depression at 0600 UTC on June 22, while located in the Bay of Campeche. The depression strengthened and was estimated to have become a tropical storm on June 23. By early on the following day, the storm peaked with winds of . Later that day, it made landfall near Corpus Christi, Texas at the same intensity. The storm weakened slowly and moved across the Central United States, before dissipating over Illinois on June 28.
In Texas, the storm dropped up to of precipitation in Port Lavaca. Thus considerable flooding occurred in some areas of south and eastern Texas. Throughout the state, more than 150 houses sustained flood damage in several counties. In addition, numerous major highways were closed, including portions of U.S. Routes 59, 87, 90, and 185, and Texas State Highways 35 and 71. In Arkansas, a few buildings in Hot Springs were damaged from high winds. Elsewhere, light to moderate rainfall was recorded in at least 11 other states, though damage was minimal. The storm was the wettest tropical cyclone on record in the state of Kentucky, dropping in Dunmor. Overall, the storm was attributed to 15 fatalities and $3.6 million in damage.
Hurricane Abby
A tropical wave developed into a tropical depression near the Windward Islands on July 10. That day, the depression intensified into Tropical Storm Abby, striking Saint Lucia with winds of . Abby tracked westward across the Caribbean Sea with little change in intensity. The storm brushed the northern coast of Honduras before intensifying into a hurricane on July 15, striking the offshore Roatán island with peak winds of . Later that day, Hurricane Abby made landfall in southern British Honduras (present day Belize). Abby quickly weakened inland, moving across Guatemala and coastal Mexico. On July 17, Abby dissipated over the Mexican state of Veracruz. However, the remnants later redeveloped into Hurricane Celeste in the eastern Pacific.
Abby produced tropical storm force winds and up to of precipitation in St. Lucia. Six people died when a roof of a house collapsed. Damage in St. Lucia reached $435,000, most of which was incurred to banana and coconut crops. In Martinique, wind gusts of and about of rain damaged 33% of banana and sugar cane crops. The resultant landslides from the precipitation extensively impacted roads and bridges. In Dominica, light winds and precipitation up to with damages reaching $65,000, entirely to roads and communications. Offshore islands of Honduras reported winds up to and light rainfall. Damage in British Honduras was light, with about $40,500 in losses, mostly to agriculture.
Tropical Storm Brenda
A weak low-pressure area in the Gulf of Mexico developed on July 26, organizing into Tropical Storm Brenda a day later. The minimal tropical storm moved ashore near Cross City, Florida on July 29, and moved northeastward along the east coast of the United States, gradually intensifying despite being largely over land. Later that day, the storm briefly moved offshore before striking southern North Carolina with peak winds of . After moving through the Mid-Atlantic states and New England, Brenda transitioned into an extratropical cyclone on July 31 over Maine. The remnants of Brenda interacted with another extratropical storm over eastern Canada before absorbing it. For about a week, the remnants of Brenda drifted and executed a large loop over northern Quebec, Labrador, and adjacent waters, eventually dissipating on August 7.
Brenda was considered the worst storm to strike West Central Florida since Hurricane Easy in 1950. It brought wind gusts up to and rainfall amounts reaching at the Tampa International Airport. While no casualties are directly blamed on the storm, at least one traffic-related death took place. According to an American Red Cross Disaster Service report encompassing eight Florida counties, 11 houses sustained significant damage, while 567 suffered more minor damage. Around 590 families were affected overall. Total monetary damage in Florida is placed at nearly $5 million. Further north, other states reported strong winds and locally heavy rainfall, though no significant damage occurred.
Hurricane Cleo
A strong tropical wave produced rainfall and gusty winds in The Bahamas and the Greater Antilles in mid-August. The wave was closely monitored for possible tropical cyclogenesis and special bulletins were issued by the United States Weather Bureau. At 1800 UTC on August 17, Tropical Storm Cleo developed near Cat Island in The Bahamas. The storm headed northeastward and immediately began to intensify. Operationally, the United States Weather Bureau at the hurricane warning center in Miami did not initiate advisories on Cleo until 1500 UTC on August 18. Sustained winds were already at the time, as recorded by a reconnaissance aircraft flight. By 1800 UTC on August 18, Cleo strengthened into a hurricane.
Throughout its duration, Cleo remained a relatively small tropical cyclone. Because the storm posed a significant threat to New England, a "hurricane watch" was issued for southeastern Massachusetts and Rhode Island on August 19. Various gale warnings were also put into effect from Block Island, Rhode Island, to Portland, Maine. However, this was unnecessary because Cleo remained well offshore. On August 19, Cleo peaked with winds of , but it weakened to a tropical storm the next day. Cleo curved east-northeastward on August 20, remaining south of Nova Scotia, until it dissipated a day later.
Hurricane Donna
A tropical wave in west Africa, blamed for 63 deaths in a plane crash in Senegal, developed into a tropical depression south of Cape Verde late on August 29. The depression strengthened into Tropical Storm Donna by the following day. Donna moved west-northwestward at roughly and by August 31, it reached hurricane status. Significant deepening occurred during the next 30 hours, with Donna being a moderate Category 4 hurricane by late on September 2. Thereafter, it weakened some and brushed the Lesser Antilles later that day. On Saint Maarten, the storm left a quarter of the island homeless and killed 7 people. An additional 5 deaths were reported in Anguilla and there were 7 other deaths throughout the Virgin Islands. In Puerto Rico, severe flash flooding led to 107 fatalities, 85 of them in Humacao alone. Donna further weakened to a Category 3 hurricane late on September 5, but eventually became a Category 4 hurricane again. While passing through The Bahamas, several small island communities in the central regions of the country were leveled, but no damage total or fatalities were reported.