By the next morning , on August 27 , the NHC gave out a hurricane watch that included the New Orleans metro area , which was upgraded to a hurricane warning by 10:00 p.m. CDT that same evening . By the next morning , on August 27 , the NHC issued a hurricane watch that included the New Orleans metro area , which was upgraded to a hurricane warning by 10:00 p.m. CDT that same evening .