The spatiotemporal evolution of storm tracks in the North Pacific in winter is investigated using NCEP/NCAR reanalysis data from December 1948 to February 2010 and the Fuzzy C-Means method.The storm tracks are divided into three patterns:The Common Pattern (TCP),The Northern Pattern (TNP),and The Southern Pattern (TSP).The air-sea interaction and physical characteristics of the three patterns are also investigated.The results are summarized as follows:(1) The physical meanings of the three patterns are clear.They show distinct differences in storm track meridional location,corresponding to different propagating routes of synoptic-scale eddies.(2) The classification of storm tracks not only shows the meridional and zonal differences,but also exposes the characteristics of multiple centers.(3) The three patterns are related to different Sea Surface Temperature Anomalies (SSTAs).The SSTAs affect the strength and location of the Aleutian low in the lower troposphere,and the associated wind anomalies.As a result,the baroclinicity of the atmosphere is changed.The difference in the baroclinicity changes therefore causes different storm track spatial patterns.