“It’s raising the possibility of an unusual mortality event,” Moorman said. By The Associated Press VENTURA – A dead blue whale was discovered floating off Southern California’s coast Thursday. A boater spotted the whale, estimated between 70 feet and 75 feet long, in the Santa Barbara Channel, said Easter Moorman, spokeswoman for the Santa Barbara Museum of Natural History. It appeared to be floating toward a beach where another blue whale washed ashore a week ago, Moorman said. It was the third blue whale found dead off the Southern California coast this month. One washed ashore in Long Beach Harbor. 160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set!