Interannual Variability of Northern Hemisphere Storm Tracks in Coarse-Gridded Datasets

Table 2

Years used in composite study for El Niño, NAO, and IOD (JFM except OND for IOD).

El Niño	1950, 1958, 1966, 1969, 1973, 1983, 1987, 1992, 1998, 2010
La Niña	1950, 1971, 1974, 1976, 1989, 1999, 2000, 2008
Positive PNA	1977, 1981, 1983, 1984, 1987, 2010
Negative PNA	1950, 1951, 1952, 1954, 1955, 1956, 1957, 1959, 1962, 1965, 1967, 1969, 1971, 1972, 1974, 1975, 1976, 1979, 1982, 1989, 1990, 1996, 2002, 2009
Positive NAO	1950, 1957, 1959, 1961, 1967, 1973, 1974, 1976, 1983, 1989, 1990, 1992, 1993, 1994, 1995, 1997, 1998, 2000, 2002, 2008
Negative NAO	1955, 1963, 1969, 1979, 1985, 1996, 2010