In September Tu et al. had a paper out that looked at the trend in destructive tropical cyclones (hurricanes) over the past three decades. They use the PDI (power dissipation index) which combines intensity, duration, and frequency.
The authors note that “there is no significant positive correlation between local upper-ocean heat content and TC [tropical cyclone] destructiveness. In fact, TC activity is more strongly related to changes in relative SST.”
They write:
“Overall, the annual cumulative PDI of TCs reaches its maximum in the 1990s, followed by a slight decreasing trend. The annual cumulative PDI in the Southern Hemisphere has decreased significantly since the mid-1990s, while the PDI in the Northern Hemisphere decreases to a lesser extent and shows strong interdecadal variability throughout the study period.”
Go tell it on the mountain! This is known and even stated in the IPCC. And it includes all weather related disasters. Not just the cyclones in the article. It is never reported and “climate scientists” seem very reticent about letting out this big secret. But as long as the media is ignoring (suppressing) it why worry?
Focusing on major hurricanes (Category 3-5) in the Atlantic, Vecchi et al. conclude that their counts also show little evidence of a long-term increase since the 1880s after accounting for changes in observing system capabilities (limited ship observations); they also show that US landfalling major hurricanes (with no adjustment) have no significant increasing trend since the late 1800s.
