Assessment of tropical cyclone frequency over Western North Pacific and North Indian Ocean from 1991‒2020
The tropical cyclone (TC) frequency intensity over the Western North Pacific (WNP) and North Indian Ocean (NIO) was evaluated from the 1991‒2020 period to identify the variability of TC frequency at different intensities and seasons. The TC intensity was classified based on the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) criteria from tropical storm (TS), severe tropical storm (STS), and typhoon (TY). The results show an inverse relationship between the WNP and NIO in terms of more frequent TC occurrence. Further, in both WNP and NIO, the strong tropical cyclone, typhoon, occurred during autumn. A clear relationship of ENSO to the TC frequency in the WNP is presented.