After encountering dry air and strong vertical wind shear, Andrea weakened to a subtropical depression on May 10 while remaining nearly stationary, and the National Hurricane Center discontinued advisories early on May 11.

Offshore North Carolina, high waves of 34 feet (10 m) and tropical-storm-force winds damaged three boats; their combined nine passengers were rescued by the Coast Guard, although all nine sustained injuries.

[5] The National Hurricane Center first mentioned the possibility of tropical cyclogenesis on May 8, while the storm was located about 230 miles (370 km) east-southeast of the South Carolina coastline.

[6] The system changed little in organization throughout the day,[7] though by the following morning, hurricane specialists indicated the low was acquiring subtropical characteristics[8] as it tracked over progressively warmer waters.

Based on the observations and the hybrid structure of the system, the National Hurricane Center classified the low as Subtropical Storm Andrea at 1500 UTC on May 9 about 150 miles (240 km) northeast of Daytona Beach, Florida.

[10] By early on May 10, much of the associated weather was located to the east of the cyclone within a band of moderate convection due to a brief spell of westerly vertical wind shear.

[11] This disorganization of the center, combined with increasing wind shear and dry air suppressing convective activity, caused it to begin weakening later that morning.

[13] Though a few intermittent thunderstorms persisted over the eastern semicircle, the depression remained disorganized and weak; the National Hurricane Center discontinued advisories early on May 11, after it had been without significant deep convection for 18 hours about 80 miles (130 km) northeast of Cape Canaveral, Florida.

[16] It accelerated east-northeastward away from the continental United States without redeveloping, and after passing over cooler waters,[17] the remnants of Andrea merged with an approaching cold front on May 14.

[3] Upon first becoming a subtropical cyclone, the National Hurricane Center issued a tropical storm watch from the mouth of the Altamaha River in Georgia southward to Flagler Beach, Florida.

All nine were injured to some degree; three endured hypothermia, one received a broken rib, and one Coast Guardsman experienced back injuries from the surf.

[21] The winds covered portions of North Carolina Highway 12 with sand,[29] and for a day the route was closed after waves from the storm washed out about 200 feet (61 m) of roadway.

Minor to moderate beach erosion caused the Florida Department of Transportation to fill in areas near the seawall with sand.

[34] Outer rainbands produced light rainfall, with the highest report in the Jacksonville National Weather Service area of responsibility totaling 0.77 inches (20 mm); the bands also caused tropical storm force wind gusts in the northeastern portion of the state.