It is the costliest hurricane to ever hit the United States, surpassing the record previously held by Hurricane Andrew from 1992. In addition, Katrina is one of the five deadliest hurricanes to ever strike the United States.
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The magnitude of intensification was poorly forecast and both forecast models and meteorologists suffered from record-high prediction errors. On October 23, two Hurricane Hunter missions both revealed the storm to have acquired maximum sustained winds of 205 mph (330 km/h) and a pressure of 879 mbar (hPa; 25.96 inHg).