![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiYNHqU9eprbjAewGp1G5M4G3fH7PsXd7zqzKbdkncDKR5QoUW1S4rKuD_ndOJmGF3zqucwz83xydmCraw3A32z6WMYNguLc9wr5XxB_GR5ERuFyNHuE2Uh63zNGf7Trj4dCCpLStXIkRw/s400/hurricaneforcewindscaleextended.png)
based on earlier work seen somewhere in the net. since the B-scale has worked well but ends up at the point where a wooden, well-built ship disintegrates, taking no account to the washed-to-shore iron-hulled fishing boats which still may float someday.
the table in graphical format (no tornado ever has been 11):
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjsW7NzlW6R7Xc8veszft_Y94QpI8vmw6eumlwTMZU6EzERYgEoD4cLMeRwjsuFczNrNAN9SG1PQp-6F9EzwvRgg5Iqyn5VttpNdbuMlDRYV9BDwviQm5huFArXica3Jx82CBan8k0YXiA/s320/graficalhfws.png)
Update: Sharing the .ods -file used to make the images. (Hurricane Patricia (2015) with measured measured winds of 175 kt = 5,83 hfws = cat 6) added to the list
https://drive.google.com/file/d/0B34nFtPgUZzjUWhpTl9sQXhzT2M/view?usp=sharing
As can be seen nothing happens at -5 (calm), and at >+5 everything happens.
Theoretically possible would be a category 7 in this scale, as described here: https://robertscribbler.com/2016/07/29/hothouse-2090-category-6-hurricane-a-grey-swansong-for-tampa/
Let's hope it won't get to that.