Time series of tropical cyclones in the Central North Pacific basin

Time series of tropical cyclones (tropical storms and hurricanes) in the Central North Pacific basin from 1966 to 2010. Although there was a period of greater tropical cyclone activity from the 1980s to mid-1990s, the basin has again entered a quieter time, with fewer average annual occurrences of storms. Broken lines denote the means for the periods 1966-81, 1982-94, and 1995-2010. Data from Chu (2002), figure from Keener et al. (2012).