After Paris is ravaged by the storm at the beginning of the movie, the team of experts in Washington, DC is watching a new report that the storm system decimated much of the American Midwest. The new report is captioned, "C6 storm leaves destruction of Las Vegas to Chicago." C6 is a reference to the "Category 6" of the first film's title. However, there is no such thing as a Category 6 storm; the maximum is Category 5, no matter how much more powerful a given storm is than the threshold for that classification. In fact, the storm described in the first film was a Category 4 hurricane.
[This might be a bit long: The Saffir-Simpson scale is not sent down by God, it is man created. According to Robert Simpson, co-creator of the scale, the scale stopped at 156mph for 2 reasons: 1) The damage inflicted by wind speeds above 156mph pretty much looks all the same. 2) Cat5 storms WERE pretty rare. There is debate, and has been for some time, about changing the scale or modifying it. In whatever fictional timeline the movie exists, the scale could have been easily altered and increased.
http://www.livescience.com/forcesofnature/051020_hurricane_winds.html.]
Corrected by Rlvlk
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