Wikipedia
The National Hurricane Centers HURricane DATabases (HURDAT) are two separate databases that contain details on tropical cyclones, that have occurred within the Atlantic Ocean and Eastern Pacific Ocean since either 1851 or 1949.
The Eastern Pacific database was originally compiled at the NHC during 1976, to help with the initialization with two tropical cyclone forecast models. Initially tracks for the Central Pacific region and tracks for tropical depressions, that did not develop into tropical storms or hurricanes were not included within the database. Over the next few years tracks were archived best track data from the Eastern Pacific Hurricane Center (EPHC) were archived by the NHC on an annual basis. During 1982 the NHC started to include data on Central Pacific tropical storms and hurricanes within the database, before they took over the responsibility for issuing advisories during 1988. The format of the Eastern Pacific database was subsequently significantly changed during 2013 to include non-synoptic best track times and non-developing tropical depressions.