LeafByNiggle
Well-known member
The chart posted in support of this claim does not really address the claim very well. The only way to infer from the data in that chart anything about the intensity of hurricanes is by noting the number of category 3,4,or 5 hurricanes as compared to category 1&2. But that is a very indirect statistic. For example, it could be that hurricanes are getting more extreme, but few of them are crossing the boundary between 2 and 3, which is the only thing this graph would show. It does show how many crossed the border from 3 to 4 or 4 to 5. And even then you would have to take the ratio between category counts and compare those ratios over time. Even looking at this chart and focusing only on the red lines, without doing the actual math, it sort of looks to me like they are more prominent as we move the right. What is really needed to assess this claim is to measure the wind speed of each hurricane and see how those speeds distribute.If you look at the actual data you will see that hurricanes are not in fact getting more extreme. That is an exaggeration, and is regrettably typical of the misleading coverage this issue gets.
But even without empirical data, it makes sense that hurricanes would be more extreme. We do know that the ocean temperatures are rising over time. And we do know that higher ocean temperatures feed more energy into hurricanes. (That is why there is a hurricane “season”.) So it would be very surprising if hurricanes were not more energetic as a consequence.