ANALYSES OF THE ANNUAL FREQUENCY ANOMALIES OFTYPHOONS AND HURRICANES IN 1998

In 1998, the annual frequency of typhoon (including tropical storms) genesis created a minimum value ― 14, far lower than the minimum of 20 in 1950 over North-West Pacific, while in the Atlantic Ocean, the annual frequency of hurricanes (including the tropical storm) created a maximum value ― 14, far higher than the average number ― 9.2. In this paper, an analysis on the relationship between the generation of Typhoon, Hurricane and the Cross-Equatorial Flow was done by using the NCEP/NCAR reanalysis data for 1979 –C 1995. It is pointed out that the anomalies of the CEF over the Pacific and Atlantic Ocean is the main cause for the 1998 annual frequency anomalies of Typhoon and Hurricane, respectively.