Storm history of Hurricane Katrina
By the afternoon of August 28, the storm was large enough that some areas of the Gulf Coast were already experiencing tropical storm-force winds. The center of Katrina was about 180 statute miles (290 km) from the mouth of the Mississippi River, but tropical storm-force winds extended 230 mi (370 km) from the center of the storm, and hurricane-force winds extended about 105 miles (170 km) away.