Lorenzo, which became the easternmost Category 5 Atlantic hurricane on record, caused 11 deaths after sinking the French tugboat Bourbon Rhode and 8 other fatalities from rough surf along the East Coast of the United States.

Additionally, Tropical Storm Nestor caused a tornado outbreak across west Florida in mid-October, leaving $125 million in damage, while a car crash in South Carolina killed three people.

Tropical Storm Olga caused moderate damage and heavy flooding over the central Gulf Coast and generated hurricane-force wind gusts as far north as Tennessee.

Most forecasting agencies projected a near-average or slightly above season, with many expecting near-normal sea surface temperatures but expressing uncertainty about the intensity of El Niño.

[23] Factors contributing to abnormally high activity included a stronger west-African monsoon, warmer than average ocean temperatures, and low wind shear, particularly over the western Atlantic and Gulf of Mexico.

[33] A mesoscale convective vortex formed over the Central United States on July 2 and moved slowly eastward, southeastward, and then southwestward, reaching the Gulf of Mexico about a week later.

The low, which had a large area of deep convection, gradually organized, becoming a tropical depression around 00:00 UTC on July 11 roughly 190 mi (305 km) south of Mobile, Alabama.

[34] Flooding damaged a number of homes, businesses, and roads in a narrow swath of southwestern Arkansas, while several roadways were closed, including a portion of Interstate 30.

[27] Encountering very warm water temperatures, ample moisture, and low wind shear, Dorian began rapidly intensifying on August 30, reaching major hurricane intensity around 18:00 UTC that day.

[60] The storm damaged homes, buildings, and boats, as well as downed trees, across Canadian Maritimes, though the worst impacts occurred in Halifax, Moncton, and much of Prince Edward Island.

However, deep convection increased along the trough early on August 26, and a new low developed, with a tropical depression forming at 12:00 UTC that day about 345 mi (555 km) south-southeast of Cape Hatteras, North Carolina.

Initially poorly-organized due to northwesterly wind shear, the depression strengthened into Tropical Storm Erin late on August 27 following the development of a large burst of convection.

[66] Throughout the second half of August, an upper-level low progressed eastward from the southeastern United States to Bermuda, southward to Puerto Rico, and westward across Hispaniola and Cuba.

Fernand progressed south of a ridge over the south-central United States, making landfall about 30 mi (50 km) north-northeast of La Pesca, Tamaulipas, at 15:30 UTC on September 4.

Thereafter, the influence of mid-latitude westerlies caused the cyclone to turn northeast and begin extratropical transition, completing it by 12:00 UTC on September 10 490 mi (790 km) northwest of the western Azores islands.

High wind shear and dry air caused Humberto to embark on a weakening trend thereafter, and it transitioned into an extratropical cyclone by 00:00 UTC on September 20 about 575 mi (925 km) south-southwest of Cape Race after being stripped of its convection.

Humberto's large size caused choppy seas along the East Coast of the United States for several days; rip currents killed one person in Florida and a second in North Carolina.

As many as 600 buildings—including L.F. Wade International Airport, Royal Naval Dockyard, and the Bermuda Weather Service—suffered damage,[74][75][76] around 28,000 customers were left without power,[72] and the island's banana crop suffered a 90 percent loss.

It spawned an elongated area of low pressure four days later, and that feature gradually organized into a tropical depression by 06:00 UTC on September 17 while located about 1,100 mi (1,770 km) east of the Windward Islands.

Although moderate northeasterly wind shear initially hampered its development, the depression intensified into Tropical Storm Jerry by 06:00 UTC on September 18 and began rapid intensification eighteen hours later.

Although the storm remained more than 2,000 mi (3,220 km) offshore the United States, swells and rip currents resulted in eight deaths, with one in Florida, four in North Carolina, two in New York, and one in Rhode Island.

Deep convection formed north of the low's center, leading to the formation of Subtropical Storm Melissa by 06:00 UTC on October 11 about 205 mi (330 km) south-southeast of Nantucket, Massachusetts.

[90] A vigorous late-season tropical wave, accompanied by a broad area of low pressure and a large mass of deep convection, moved off the west coast of Africa on October 13.

Thunderstorm activity associated with the low became better organized early the following day, resulting in the formation of a tropical depression at 12:00 UTC on October 14 roughly 345 mi (555 km) southeast of the Cabo Verde Islands.

As the depression moved northwestward toward the Cape Verde islands, it encountered a hostile environment of high wind shear and abundant dry air, which prevented further strengthening.

After scatterometer data and satellite imagery indicated the presence of a closed circulation, the system developed into Tropical Storm Olga at 12:00 UTC the following day roughly 390 mi (630 km) south-southwest of Lake Charles, Louisiana.

Hurricane-force wind gusts impacted parts of Mississippi,[103] where the remnants of Olga damaged or destroyed 772 homes, 26 businesses, and 27 roads; Tupelo was particularly hard hit.

Deep convection formed around the center of the new low on October 30 due to increased atmospheric instability despite sea surface temperatures of only 70 °F (21 °C), leading to the development of Subtropical Storm Rebekah at 12:00 UTC.

On October 31, Rebekah turned to the east then east-northeast, entering a region of low relative humidity, increasing wind shear, and even colder sea surface temperatures.

Enhanced by a convectively-coupled kelvin wave, the disturbance coalesced over the next few days and was designated as Tropical Storm Sebastien around 06:00 UTC on November 19 to the northeast of the Leeward Islands.