Conversation so far:
when was new orleans told to evacuate for katrina
At a news conference 10:00 AM on August 28, shortly after Katrina was upgraded to a Category 5 storm, New Orleans mayor Ray Nagin ordered the first ever mandatory evacuation.
was there another option besides evacuation for katrina
The city government of New Orleans also established a refuge of last resort for citizens who could not leave the city, at the massive Louisiana Superdome.

Question: how many people died
Self-contained rewrite: how many people died in hurricane katrina