Here are some timelines that I found with direct sources:
http://64.233.179.104/search?q=cache:hEP6_KL2CP0J:www.thinkprogress.org/katrina-timeline+katrina+timeline+&hl=en
Which is a liberal site (anti-Bush) - Let's see the difference between what they post and the other site.
Here is the other site:
http://64.233.179.104/search?q=cache:yrY9Jo9XnwgJ:www.ojr.org/ojr/wiki/Katrina_Timeline/+katrina+timeline+&hl=en
This organization is part of the University of Southern California - which was founded by Walter Annenberg, Philanthropist and Publisher who was appointed ambassador to Great Britain by Richard Nixon for his anti-communism and pro-Vietnam-War views.
I don't know if this site would be a conservative site because it says it is neither liberal nor conservative.
I looked at that ThinkProgress timeline and website and it is so biased it is worthless. No mention of buses......