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This satellite image is from around 10:30 a.m. CST on Aug. 31, 2005, as Tropical Depression Katrina storms the Great Lakes. The hurricane was responsible for at least 120 deaths and billions of dollars in damages.
It was a different scene the morning of Aug. 29, as Katrina hit land in southeastern Louisiana as a Category 4 storm, with maximum sustained winds of 145 mph, according to the National Hurricane Center.
This chart shows the path of Hurricane Katrina and the power that it picked up as it swept from Florida across the Gulf of Mexico. The warm water increased the strength of Katrina's hurricane-force winds (red) and the tropical winds (brown). The winds weakened when the storm hit land.