The practice of naming tropical storms began in 1953 by the National Hurricane Center. There are six lists of names and each list is recycled every six years. The list is maintained and updated through a strict procedure by an international committee of the World Meteorological Organization. Every so often, when a storm is particularly deadly or costly, that name is retired. The WMO committee retired the name Sandy after last year's storm, and will replace it with Sara when the list is used again in 2018.