The El Ni�o/ Southern Oscillation event has widespread effects on global atmospheric conditions. During El Ni�o years, it has been observed that the tracks of extratropical cyclones over the United States are altered compared to those during non-El Ni�o years. How cyclone tracks are affected during an El Ni�o event is the focus of this study. Cyclone tracks are plotted across the North American continent for the period 1 December 1997 � 31 March 1998. The frequency of occurrence and the location of the tracks during this period are compared to two other El Ni�o years (1982-83 and 1987-88) and two non-El Ni�o years (1985-86 and 1995-96). This paper examines results from both El Ni�o and non-El Ni�o cases. There appears to be an equatorward shift in the cyclone tracks during El Ni�o years compared to non-El Ni�o years, which can have a significant impact on the weather patterns of areas that are crossed (or missed) by cyclones during an El Ni�o year