Original: Between 1992 and 2001 , two different numbers were given to subtropical depressions or subtropical storms , one for public use , the other one for NRL and NHC reference . For example , Hurricane Karen in 2001 was initially known as Subtropical Storm One as well as AL1301 ( or 13L for short ) .
Simplified: After that , subtropical storms were just numbered , such as Hurricane Karen from 2001 which was originally named Subtropical Storm One .