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The article calls Hurricane Katrina a category 5. It was a category 3 at landfall but due to it's size, fetch and the area it impacted it ended up being one of the worst disasters in US history. Category 3 does not represent the threat, only the wind speed.
Same goes for Tropical Storms Allison and Imelda or the unnamed tropical low that created the 2016 LA flooding or Hurricane Florence (cat 1). Those were closer to a cat 3-4 based on impact to property than some random tropical storm and easily posed a much bigger threat than Hurricane Patricia did as the strongest hurricane ever recorded. Patricia was fast moving and tiny. The hurricane force winds only extended out about 15 miles from the center, it was moving quickly, hit an unpopulated area with little surge impact. The costliest disaster in US history was Sandy, it's classification was a post tropical storm and no category assigned. Sandy was the equivalent to a category 1 hurricane, the damage was greater than any category 5 ever seen. However, that damage was spread over such a massive area it would be a category 3-4 based on impact to life and property.
Agree completely.
On the same level, some hurricanes should be downgraded based on impacts even though the wind speeds were higher.
I dunno about this. While I agree 100% in theory with adding storm surge, rain and other categories as part of the equation, I think that downgrading a storm with 200 mph winds simply because it's fast moving and doesn't have a high storm surge would be pretty dangerous in terms of not effectively communicating a threat based upon how we classify storms now via the saffir-sampson wind scale. If the goal of communication of this category is to preserve life, I think it still stands.
Communicating to people that there's, say, a Cat 2 or 3 hurricane who don't understand what that means or don't have the means to (elderly, non-native speaker, cognitive impairments, economically disadvantaged, whatever) would seem to communicate that the threat isn't as severe relatively speaking. Sure, any category of hurricane with regard to wind speed can technically kill you, but wind speeds of a 5 can cave your roof in depending on the home - while a 3 will likely only incur damage to your roof (maybe more if you're in a mobile home).
I speak to so many survivors that simply are not prepared to deal with the impacts because it was just a tropical storm or a cat 1.
Right, and I think it's a huge issue. I'm spitballing here - but maybe it makes sense to rate hurricanes not on a combination of threats, but if any one of the variables that indicate a threat to life are high?
The variables that contribute to life-threatening hurricane weather could be as you said:
- Wind speed (already estimates property damage within this)
- Storm surge ( i think SLOSH predicts / analyzes this?)
- Rainfall amount/Flood potential
Examples:
Hurricane Alpha:
Wind speed/rating: 110 mph/ 2
Storm surge/rating: 25 feet / 5
Rainfall/flood potential: 17 inches/ 4
Final rating: Category 5
Why: High probability of life-threatening storm surge and threat of destruction to structures, property
Hurricane Beta:
Wind speed/rating: 175 mph/5
Storm surge/rating: 0-0.5 ft. / None
Rainfall/flood potential: 4 inches/None
Final rating: Category 5
Why: High probability of life-threatening wind and threat of destruction to structures, property
I dunno, just some thoughts
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