And eventually evolved into a Category Five storm the very same day , with winds blowing at about 175 mph ( 280 kph ) .
The next day , Sunday , August 28 , Katrina became a Category 4 hurricane .
Eventually evolved into a Category Five storm the very same day , with winds blowing at about 175 mph ( 280 kph ) .
The next day , Sunday , August 28 , Katrina became a Category 4 hurricane .