o donnell: deadly shark attack. a pennsylvania woman on a cruise killed while snorkeling in the bahamas. and the obamas return to the white house. let me thank my husband, first of all, for such spicy remarks. ( laughter ) this is the cbs evening news with norah o donnell, reporting from the nation s capital. o donnell: good evening to our viewers in the west, and thank you for joining us on this wednesday night. onight, wildfires are leaving a trail of destruction amid record-breaking heat in the west. the california heat wave is stretching into its eighth straight day with seven states under warnings and advisories. the temperatures are record breaking. salt lake city and fresno, california, had their hottest september days ever. the brutal heat is straining california s power grid and power companies are pleading with the public to conserve energy. the governor there sending out rare text alerts to avoid rolling blackouts. the dry weather has caused more than a doz