Tropical Storm Ana was the first named storm of the 2015 Atlantic hurricane season. A pre-season system, it became the earliest United States–landfalling tropical cyclone on record. It developed as a subtropical cyclone from a non-tropical low north of the Bahamas, and intensified to attain peak winds of 60 mph (97 km/h) before transitioning into a fully tropical cyclone early on May 9. Sustained in part by the warm waters of the Gulf Stream, Ana made landfall along the northeast coast of South Carolina early the next morning. Overall, damage from the storm was minor. Heavy rainfall and gusty winds affected parts of the Carolinas, and some vulnerable beaches endured coastal flooding and several feet of erosion. Gusty winds damaged trees and powerlines, causing sporadic power outages, and a weak tornado was reported in association with Ana. In North Carolina, two deaths—one direct and one indirect—were attributed to the storm.

Tropical Storm Bonnie was a weak but persistent tropical cyclone that brought heavy rains to the Southeastern United States in May 2016. The second storm of the season, Bonnie formed from an area of low pressure northeast of the Bahamas on May 27, a few days before the official hurricane season began on June 1. Moving steadily west-northwestwards, Bonnie intensified into a tropical storm on May 28 and attained peak winds six hours later. However, due to hostile environmental conditions, Bonnie weakened to a depression hours before making landfall just east of Charleston, South Carolina, on May 29. Steering currents collapsed afterwards, causing the storm to meander over South Carolina for two days. The storm weakened further into a post-tropical cyclone on May 31, before emerging off the coast while moving generally east-northeastwards. On June 2, Bonnie regenerated into a tropical depression just offshore North Carolina as conditions became slightly more favorable. The next day, despite increasing wind shear and cooling sea surface temperatures, Bonnie reintensified into a tropical storm and reached its peak intensity. The storm hung on to tropical storm strength for another day, before weakening into a depression late on June 4 and became post-tropical early the next day.