27 August: Katrina declared category three hurricane.
Evacuation of New Orleans begins. Some head for Superdome.
28 August 2am: Katrina upgraded to category four.
7am: Katrina upgraded to category five.
10am: Mandatory evacuation order issued for New Orleans.
29 August: Katrina downgraded to category four.
30 August: New Orleans without power or drinking water.
Levee breaches flood large areas.
Looting and gun violence erupt Military heads for New Orleans at FEMA request.
Katrina downgraded to storm.
31 August: George Bush begins aid mobilisation.
Public health emergency declared.
Superdome evacuation begins.
1 September: Violence disrupts relief effort.
2 September: First supply convoy reaches Superdome.
Bush declares $10.5bn aid budget for hurricane affected areas.
3 September: Power restored for 1M Gulf Coast residents.
4 September: Coast Guard says it has rescued 17,000 people following Hurricane Katrina.
5 September: Some New Orleans residents allowed home to retrieve belongings.
Levee breach at 17th Street Canal repaired.