text: The Hurricane Katrina tornado outbreak was a tornado outbreak across the eastern United States from August 29 to August 31 , 2005 , spawned mostly by the outer bands of Hurricane Katrina ( or the remnants thereof ) .
simplified: The Hurricane Katrina tornado outbreak was a tornado outbreak across the eastern United States from August 29 to 31 , 2005 , spawned mostly by the outer bands of Hurricane Katrina ( or the remnants thereof ) .