Looks like down the road we may see a cat 6 storm starting at 175,for now it doesn’t exist.
http://www.hurricane.com/category-6-hurricane.php
The amount of damage between each category does not increase linearly. Each increase in category greatly increases the damage potential. The original scale included no Category 6 hurricane. Robert Simpson has stated that there was no reason to include an additional category because the damage would be severe no matter the wind speed over 155 mph. Improvements in building engineering over the past roughly 35-40 years may have changed that dynamic and might necessitate the addition of a category 6 hurricane.
In our view, if the Saffir-Simpson scale were adjusted to include another category, it would likely be as follows:
Category 1 hurricane: 74 to 95 mph
Category 2 hurricane: 96-110 mph
Category 3 hurricane: 111-130 mph
Category 4 hurricane: 131-155 mph
Category 5 hurricane: 156-175 mph
Category 6 hurricane: greater than or equal to 176 mph
It doesn’t exist because it’s not needed, and likely would be dangerous if it were implemented. People would go ‘oh, it’s only a Cat 5, man, I’d be out of here if it was a Cat 6... Honestly, if he had cut off his scale at 4, more lives would be saved because people would take warnings more seriously.
Storm surge is the killer. We need a storm surge scale.