While the research for this paper was conducted by the lead author as part of a Ph.D. course of study at the University of Auckland, it should be noted that he is also affiliated with the NOAA National Climatic Data Center. Thanks are due to Dr. Anthony Fowler at the University of Auckland’s School of Environment for comments on an earlier draft of this study, as well as to the two anonymous reviewers of the paper for their very positive feedback and useful comments. Finally, thanks also go to Dr. Mark Morrissey at the University of Oklahoma and Mr. Derrick Snowden at NOAA’s Integrated Ocean Observing System program, for consultation on some of the statistical work included herein. Financial support for Drs. Lorrey and Renwick came from the New Zealand Ministry of Science and Innovation contract C01X0701 (formerly “Adaptation to Climate Variability and Change”), which currently funds the NIWA core science project “Climate Present and Past.”
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In the Southern Hemisphere, the TC season straddles the change of calendar year; therefore, the 1970 season extends from November 1969 through April 1970, and the season is thus labeled as 1970 here. This will be the seasonal convention utilized throughout this paper.
Work is underway to eventually incorporate the work done in constructing the SPEArTC dataset back into IBTrACS.
The height of the season is from January to March in which 67% of the storms occur.
The date line has no physical significance as it merely traverses around the antimeridian at 180° longitude, but is still a useful and popularly used reference point for describing TC activity in the region.
Based on a 10-min averaged wind speed.