By 1947, tropical cyclones developing in the North Atlantic Ocean were named by the United States Army Air Forces in private communications between weather centres and aircraft using the Phonetic alphabet. This practice continued until September 1950, when the names started to be used publicly after three hurricanes (Baker, Dog, Easy) had occurred simultaneously and caused confusion within the media and the public. Public use of the phonetic alphabet continued until the 1953 Interdepartmental Hurricane Conference, where the decision was made to start using a new list of female names during that season, as a second phonetic alphabet had been developed. During the active but mild 1953 Atlantic hurricane season, the names were readily used in the press with few objections recorded; as a result, the same names were reused during the next year with only one change: Gilda for Gail. Over the next six years a new list of names was developed ahead of each season, before in 1960 forecasters developed four alphabetical sets and repeated them every four years. These new sets followed the example of the typhoon names and excluded names beginning with the letters Q, U, X, Y, and Z, and keeping them to female names only.