They used the location of peak intensity of cyclones as a benchmark because it is a more consistent metric than statistics such as storm duration: The duration can be harder to estimate because of difficulties in establishing precisely when a storm should first be considered a tropical cyclone. (sciencedaily.com)
The critical area near Peak Intensity on the Nexus 7 is discussed in greater detail in this Display News article. (displaymate.com)
The implications are serious, since the movement of peak intensity means regions further north and south of the equator, which have not previously had to face many landfalls by violent cyclones, may now have greater exposure to these extreme weather events. (sciencedaily.com)