In response to the storm's projected path into the Gulf of Mexico, prices for crude oil rose on the New York Mercantile Exchange at branch offices in London. Natural gas prices rose considerably in New York Mercantile Exchange electronic trading on August 2. Anticipation of a threat to supply by a potential Hurricane Chris coupled with high demand during an ongoing heat wave were cited as part of the reasons in the price move. In New Orleans, officials including Mayor Ray Nagin prepared for a possible evacuation of the city if Chris entered the Gulf of Mexico as a hurricane. The evacuation plan included moving all residents out of the city as a worst-case scenario, intended to avoid a re-occurrence of Hurricane Katrina around 1 year prior. Florida Emergency Management requested 10 mobile recovery centers, and placed hospitals in the Florida Keys on standby for evacuation. Officials in Mississippi identified the need for 110 to assist in an evacuation process in case of a possible landfall. Both Louisiana and Texas emergency operation centers monitored the progress of the storm, though did not execute any preparation action.