However, tropical cyclogenesis is possible at any time of the year, as demonstrated by formation in April of an unnamed subtropical storm in the central Atlantic.

One month later, Hurricanes Bonnie and Charley produced tropical storm-force winds in the Azores, and the former caused one fatality.

[8] Though September is the climatological peak of hurricane season,[15] an increase in wind shear prevented tropical cyclogenesis in the first half of the month.

[17] On April 21, a low-pressure area separated from the prevailing westerlies about 600 miles (970 km) southeast of Bermuda, and developed into a subtropical depression at 1200 UTC.

[19] Isolated from strong steering currents, the depression tracked northwestward at 12 mph (19 km/h), and intensified into a subtropical storm early on April 22.

[18] A hurricane hunter's flight into the system confirmed the weakening, and also reported a 1.8 °F (1 °C) temperature rise in the center, suggesting a warm core and some tropical characteristics.

[23] By late on April 24, the system was too weak to classify using the Dvorak technique, and the NHC ceased issuing advisories.

[26] Outflow from Hurricane Celia in the Pacific Ocean and a trough in the Gulf of Mexico generated wind shear on the depression, which prevented it from intensifying into a tropical storm.

[28] Large amounts of precipitation resulted in flooding, which damaged or destroyed hundreds of homes and caused two fatalities in provinces of Pinar del Río and La Habana.

Once it reached mid-ocean, an increasingly northerly steering flow dropped the system down into the subtropics to the east of Bermuda, and it maintained decent organization.

[34] Instead, the depression weakened by late on July 25, with satellite imagery indicating that much of the deep convection was removed from the surface circulation.

[35] By July 26, the National Hurricane Center issued its final advisory, noting that it was "too weak to classify and is rapidly losing its identity".

It bypassed the Lesser Antilles completely, and turned to the west in response to a building high pressure system to the north.

Upon turning to the west, a trough of low pressure positioned to the southwest of Andrew created an environment with little vertical shear and well-defined outflow.

Andrew rapidly intensified under ideal conditions for development,[13] and on August 23 the hurricane peaked with winds of 175 mph (282 km/h).

It crossed the Bahamas at that intensity, weakened slightly, and re-intensified to a 165 mph (266 km/h) Category 5 hurricane before making landfall near Homestead, Florida.

A strong mid-latitude trough turned Andrew northward, where it greatly weakened before hitting west of Morgan City, Louisiana on August 26 as a 115 mph (185 km/h) Category 3 hurricane.

[38][39] In the Bahamas, Andrew brought high tides, hurricane-force winds,[40] and tornadoes,[41] which caused significant damage in the archipelago, especially on Cat Cays.

Due to light vertical wind shear, Bonnie quickly strengthened, and became a hurricane late on September 18.

[52] By 1500 UTC on September 27, the National Hurricane Center declared Bonnie extratropical, since it was losing tropical characteristics.

[53] Bonnie re-acquired tropical characteristics, and the National Hurricane Center resumed advisories on the storm by 2100 UTC on September 28.

Bonnie re-strengthened to a strong tropical storm before vertical wind shear weakened it while approaching the Azores.

By the following day, satellite imagery noted a well-defined low-level circulation and thus, Tropical Depression Five while centered about 633 miles (1,019 km) south of the Azores.

While offshore of North Carolina on September 25, Danielle reached its peak intensity as a moderately strong tropical storm with maximum sustained winds of 65 mph (105 km/h).

In addition, street flooding also closed several roads in the region,[61][62][63] most notably, North Carolina Highway 12.

[71] However, wind shear exposed the center of the depression again by early on September 30, though it was still forecast to intensify to tropical storm status.

[72] By late on October 1, satellite imagery noted that the depression dissipated, and the National Hurricane Center issued its final advisory on the system.

Initially, the depression remained weak, but after reaching the Gulf Stream it strengthened into Tropical Storm Earl at 1200 UTC on September 29.

Early on October 1, Earl reached maximum sustained winds of 65 mph (105 km/h) and a minimum barometric pressure of 990 mbar (29 inHg).

[82] After reaching peak intensity, Frances began tracking over cooler sea surface temperatures, which gradually weakened the storm.