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Patricia, Strongest Hurricane Ever Seen In Eastern Pacific, Strikes In Mexico
CNN reports that Hurricane Patricia has made landfall in Mexico; Patricia is notable for having the third-lowest barometer reading ever recorded, and as "the strongest hurricane ever observed in the eastern Pacific or Atlantic oceans." Slate points out that at one point, "satellite estimates of Patricia’s intensity broke the Dvorak scale, peaking at 8.3 on the 8.0 scale. ... In fact, Patricia is now very close to the theoretical maximum strength for a tropical cyclone on planet Earth." The Weather Channel is tracking the storm's path, and predicts "catastrophic damage ... along a narrow path as the eye slices into the interior of southwest Mexico Friday night." Here's a map from the National Weather Service showing Patricia's track as well as projected path.
Your description sort of comes close. The scale was originally based on categories of visual features in satellite imagery, for use when direct wind measurements were not possible. They were roughly correlated with wind over time, but still is mainly a categorization scheme more than a scale. It is like the F and EF scales of tornado, which are roughly based on damage done to various structures. Both sets of scales have a max category, where a hurricane has the strong features or a tornado does the worst listed categories of damage. It is discrete, so there is no higher value on that scale, unless you try fitting a wind speed to it and extrapolating. But that is re-purposing and changing a scale that was not about raw wind speed into one that is.