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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. ==The Atlantic hurricane database== The initial requirement for computerized tropical cyclone data at the National Hurricane Centre (NHC), came during the mid 1960s after NASA's Apollo space programme requested data on the climatological impact of tropical cyclones on launches of space vehicles at the Kennedy Space Center. The basic data was taken by John Hope and Charles Neumman from the National Weather Records North Atlantic Tropical Cyclone deck number 988 who updated it to include data from 1886 - 1968 and applied several corrections to the data.〔http://www.pmarshwx.com/research/srtm/wbtm-44.pdf〕 The original database of six-hourly positions and intensities were put together in the 1960s in support of the Apollo space program to help provide statistical track forecast guidance. In the intervening years, this database – which is now freely and easily accessible on the Internet from the National Hurricane Center's (NHC's) Webpage – has been utilized for a wide variety of uses: climatic change studies, seasonal forecasting, risk assessment for county emergency managers, analysis of potential losses for insurance and business interests, intensity forecasting techniques and verification of official and various model predictions of track and intensity. HURDAT was not designed with all of these uses in mind when it was first put together and not all of them may be appropriate given its original motivation. HURDAT contains numerous systematic as well as some random errors in the database. Additionally, analysis techniques have changed over the years at NHC as their understanding of tropical cyclones has developed, leading to biases in the historical database. Another difficulty in applying the hurricane database to studies concerned with landfalling events is the lack exact location, time and intensity at hurricane landfall. In 2013, the archives format was significantly changed to include non-synoptic best track times, non-developing tropical depressions and wind radii. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「HURDAT」の詳細全文を読む スポンサード リンク
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