ORLANDO, Fla. — Residents of the Carolinas work up to a surprise Saturday morning: Tropical Storm Colin had formed overnight. According the National Hurricane Center, an area of low pressure formed just offshore from Savannah, Georgia, on Friday but became better organized overnight. “As a result, and rather unexpectedly, Tropical Storm Colin has formed near the South Carolina coast, centered just inland a bit to the northeast of Charleston,” the hurricane center said Saturday morning. At 5 p.m., Tropical Storm Colin was located about 50 miles west-southwest of Wilmington, North Carolina, with…