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How destructive can a hurricane be? Wave height appears to be a good indicator. For example the recent hurricane through Pennsacola (Frances) produced 52 foot waves at the data buoy located 64 nm off Alabama (this data buoy broke free from its moorings and is currently drifting). A data buoy located 120 east of Cape Canaveral reported only 30 foot waves. Last year's hurricane that struck N Carolina (that chopped through the Outer Banks) had 42 foot waves at Frying Pan Shoals.
Also interesting is how long a hurricane exists. This from a data buoy located off Cape Canaveral demonstrates how sudden the change can be during and after a hurricane:
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