The obvious question is whether climate change is causing an increase in the frequency or intensity of these storms.
3) The average temperature of the ocean water at depth has also risen. The average temperature of waters from the surface to 700 meters has risen by 1/10 of a degree Celsius since 1980. Waters from 100 to 200 meters have warmed nearly as much as surface waters. Hurricane waves churn up deeper water, bringing cooler water to the surface. In the past, this stirring of deeper water cooled the ocean surface, and acted as a buffer on the intensity of a hurricane. But now that deeper waters are also warmer, there is less tendency for wave action to moderate the strength of a hurricane.
"The GOES imager series involve technology upgrades and are not well calibrated, and so are not well suited for measuring changes in water vapour over time.