After crossing the state, Gabrielle had the appearance of an occluded frontal low or subtropical cyclone; this was after the convection decreased near the center.

On September 5, a weak low- to mid-level trough was nearly stationary a short distance off the southeastern coastline of the United States.

The system moved into the Gulf of Mexico,[1] and by September 11, the low and its associated convection were well-organized enough for the National Hurricane Center (NHC) to classify it as Tropical Depression Eight.

Northerly wind shear and the presence of a nearby upper-level low initially prevented further organization,[2] leaving the center of the depression poorly–defined with minimal convection.

[4] By early on September 13, the upper level outflow over the depression became much more conducive for intensification, although the circulation remained broad and weak.

[5] Shortly thereafter, deep convection developed and persisted near the center,[6] and at 1200 UTC on September 13, the depression intensified into Tropical Storm Gabrielle while located about 200 miles (320 km) southwest of Venice, Florida.

[1] Under the influence of a mid-level trough, Gabrielle accelerated northeastward and quickly intensified, despite increasing amounts of westerly wind shear.

[1] Its center reformed several times under the deep convection, and on September 14 Gabrielle made landfall near Venice with winds of 70 mph (110 km/h).

[12] A Hurricane Hunters flight into the system reported the center of Gabrielle became elongated, resembling a trough, and one forecaster considered the storm on the verge of becoming an extratropical cyclone.

[14] Despite strong amounts of wind shear, Gabrielle intensified to attain hurricane status early on September 17 while located about 350 mi (560 km) to the west of Bermuda.

Continuing northeastward, the hurricane strengthened slightly further to reach peak winds of 80 mph (130 km/h) about 230 miles (370 km) northwest of Bermuda.

[15] Increased wind shear eventually diminished the convection, and Gabrielle weakened to tropical storm status September 18.

[16] By early on September 19, wind shear dissipated nearly all of the associated deep convection, and Gabrielle transitioned into an extratropical cyclone about 350 miles (560 km) south of Newfoundland.

The extratropical remnant continued to the northeast, passing a short distance southeast of Newfoundland before restrengthening to reach winds of 75 mph (121 km/h).

On September 14, a tropical storm warning was issued for Lake Okeechobee and the Florida east coast from Jupiter to Saint Augustine.

Flights resumed the day Gabrielle moved ashore, with the exception of Sarasota-Bradenton International Airport which closed due to the inclement weather.

[22] While the storm was moving east across the Gulf of Mexico, Gabrielle produced rip currents along the coast of Alabama, killing one man in Orange Beach.

In the Florida Keys, there was an indirect drowning death of a man who fell off his boat; this was due to a combination of high seas, engine failure, and intoxication.

[28] However, water management officials considered the rains more beneficial than destructive, as the storm ended a 22-month rainfall deficit across southeast Florida.

[23] After moving across the state, the storm produced locally strong winds along the Atlantic Florida coastline, peaking at 59 mph (95 km/h) at Saint Augustine.

[31] While extratropical, the remnants of Gabrielle passed a short distance south of Newfoundland, the second cyclone in less than a week to affect the area.

[21] The remnant of Gabrielle dropped heavy rainfall in a short amount of time across Newfoundland, with one station at Cape Race recording 1.9 in (48 mm) in just one hour.