Comment by horsawlarway

Tornadoes are quite a bit less common outside of North America, and especially the US. Some of that comes down to the absence of people in the places where tornadoes occur, so there's no one there to report them.

The Tornado Archive (https://tornadoarchive.com/) has a pretty well executed map to illustrate that. They report that between 2011 and 2021 (just the dates I punched in, so its possible the actual ratio is a bit different from that), the world saw ~20,000 reported tornadoes. North America reported 12,000 of them.

So its not just that Americans maybe don't know how to build tornado resistant structures. Its that the US and Canada's per-capita tornado rate is quite a bit higher than the rest of the world.

> Hurricanes are mostly just flood damage in the US, and some wind/debris damage exactly like the blown over trees you mention.

The insurance companies have done research on the topic (including building giant 'labs' with a large number of fans)

* https://fortifiedhome.org/research/

and have developed standards/techniques that home builders/owners can do to fix a bunch of problems, starting with roofing:

* https://fortifiedhome.org

* https://fortifiedhome.org/wp-content/uploads/2020-FORTIFIED-...

* https://www.youtube.com/watch?v=Zd-0yAPs6Wc

* https://www.youtube.com/watch?v=proGT6AtyJc

Tornados might be more intense but only for a short period of time and in a small area. I don't see any of those where the tornado is lasting days, causing sustained damage. There are some where there are multiple tornadoes in a span, but each individual tornado is itself quick and violent but localized within a mile or so at most.

Compare some incidents with, Hurricane Sandy, for example, where it traveled across the span of a thousand miles and lasted a week of damages.

If you have to be inside one, pick a hurricane. But tornadoes are so much smaller. This list is like... 10-20 per year with an average of less than 1 casualty and a dozen houses damaged? That's basically zero as far as insurance and habitability go. I found a study titled "Tornadoes in Europe An Underestimated Threat" and it has an estimate of 10-50 million euros per year in total damage. That's not even 1 euro per house in Europe.

Let's not be silly here. European tornadoes are not taking apart houses to the foundations. Ripping off roofs or flipping over cars or even when trees are falling on a tourist tent and killing them in process has nothing to do with how houses are built in USA and nowadays even in UK and elsewhere.

The real problem is that we're politically/socially unwilling to transfer the risk to the people who are responsible for creating it: Wealthy coastal landowners believe that the cost of home insurance should be about $2000/year. If their properties actually cost $200,000 per year to insure, then that's what they should have to pay! If they don't like it, they should either build something cheaper (that's the other half of the product) or move to somewhere with less risk.

Tornados are almost the perfect example of an insurable hazard: Very low probability, very high damage, very widely distributed across the affected areas:

https://mrcc.purdue.edu/gismaps/cntytorn#

Click around that neat interactive map, you'll see that the tornado is typically a few miles long and a few hundred yards wide, there are a few thousand severe tornadoes scattered all over the Midwest and somewhat fewer on the east coast in the past 70 years. It's not feasible to build houses everywhere that will stand up to an F5 tornado throwing cars. But they only cause a total loss of a tiny fraction of all houses in the country, and there are relatively few choices anyone east of Texas can make that would meaningfully impact their risk.

You could price insurance premiums at the risk of a tornado times the cost of the insured assets, plus a 10% administrative fee/profit margin, and those rates would be affordable. Maybe a handful of people would choose to live in Colorado instead of a few hundred miles east in Kansas because the cost of this 'tornado insurance' was higher in Kansas, but even in Tornado Alley it wouldn't be unaffordable.

Conversely, if you look at the hurricane incidence and storm surge risk map:

https://coast.noaa.gov/hurricanes/#map=4/32/-80

https://experience.arcgis.com/experience/203f772571cb48b1b8b...

and population density along the gulf coast:

https://luminocity3d.org/WorldPopDen/#7/28.541/-88.011

It's clear that people are choosing to build houses in the narrow strip of low-lying land that's right along the coast and vulnerable to high-probability storm surges! If insurance was priced at cost of assets + administration times risk of loss, it would be really, really expensive.

Tornados are indeed scary. I have seen a house cut in half like a knife by one. You could see the doors ripped off the medicine cabinet on the second floor and meds still on the shelf.

But tornados are also significantly smaller. A hurricane will damage a thousand square miles while a hurricane will mess up 50. It’s not quite right but the proportions are in that ballpark.

the US would avoid flood damage if they just built apartment buildings. Asian apartments towers are immune to flooding because they allocate the ground floor to parking. Can't blow the roof off a square concrete building either.

Ofc, a sufficiently strong Tornado is destroying everything in its wake. But, they're rare in comparison.

The 2024 hurricane season damage totaled $128.072 billion.

I couldn't find data for tornadoes in aggregate, only individual storms.

> Economically, tornadoes cause about a tenth as much damage per year, on average, as hurricanes. Hurricanes tend to cause much more overall destruction than tornadoes because of their much larger size, longer duration and their greater variety of ways to damage property. The destructive core in hurricanes can be tens of miles across, last many hours and damage structures through storm surge and rainfall-caused flooding, as well as from wind. Tornadoes, in contrast, tend to be a few hundred yards in diameter, last for minutes and primarily cause damage from their extreme winds

https://www.americangeosciences.org/critical-issues/faq/how-...