Feels like something similar to the NFPA 704 safety square [0] — maybe they could copy that to mimic a relatively accepted "danger measurement" format.
Also of interest: hypercanes [1], my hurricane-adjacent Interesting Wikipedia Deep Dive, which (according to Wikipedia):
- require ocean temperatures of 120 °F (50 °C)
- have sustained winds of 500 mph (800 km/h)
- have barometric pressures in their centers sufficiently low enough to cause altitude sickness
- may persist for several weeks due to above low pressure
- may be as large as North America or as small as 15 mi (25 km) — Wikipedia has an unhelpful caption about the size of the "average hypercane" (!)
- extend into the upper stratosphere, unlike today's hurricanes (lower stratosphere)
- due to above height, may sufficiently degrade the ozone layer with water vapor to the point of causing (an additional) hazard to planetary life
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