AccuWeather’s new hurricane scale

It’s no secret that the Saffir-Simpson scale, used to rate the strength of hurricanes, is inadequate. It is based solely on wind speed, which does a poor job of communicating the potential impacts. I wrote just a few months ago that it’s time to consider retiring it. So when I heard that AccuWeather rolled out a new hurricane scale, you might think I’d be in favor of it.

You would be wrong.

It’s not that I think AccuWeather’s leadership is awful. I do, but that’s not the point here. The AccuWeather RealImpact Scale for Hurricanes does not address the fundamental weakness of the Saffir-Simpson scale because it still produces a single number. That this number is produced from more inputs isn’t novel (the original Saffir-Simpson scale included other aspects of a hurricane threat) nor is it better at explaining the threat. You still need to tell the public why it received a particular rating, and the preparation for wind damage may be different from storm surge may be different from inland flooding.

Not to mention the fact that the scale is opaque. It cannot be reviewed by researchers and meteorologists outside of AccuWeather. There’s no indication that it’s had any input from social scientists and science communication experts to make sure it even accomplishes the stated goal of improving communication to the general public. In short, it’s just AccuWeather acting on its own and pretending there’s value.

After insulting National Weather Service employees by falsely implying that forecasts are degraded during this government shutdown, AccuWeather would do well to shut up for a little bit and work with the meteorological community.