See, there's a slight reason I'd advocate against Cali in general at least: What happens when all of California's electrical devices suddenly...no longer work?
Much of California is naught but a desert supported on the back of a massive irrigation system and pumping systems. Take that away...and people tend to run out of water, fast. Especially in somewhere like Los Angeles. Take away the water? You have 18 MILLION people exploding out of the city as fast, and a far as they can get. At this point, you basically have to start looking at it as a earthquake propagation...except with people acting like locusts of death.
You can't go east. Period. Get to the mountains and then into the real desert. To the north you are going to run into the idiots who fled south out of San Fran (7.5 million), Sacramento (2.6 million), Fresno (1.1 million) and all the other places in between, who've eaten and drank everything in their path south. Go South? San Diego (3.3 Million) has people pushing north. And you have to start thinking....by the time 2 weeks after this "change"...people are going to get desperate for food and water. Most of these people are idiot city people who haven't got a clue how to hunt, trap, or discern safe drinking water.
What is the easiest prey to catch?
Other idiot city people.
....California has utterly no appeal to me for this scenario. It sounds more like a gigantic, hot as hell coffin...only following Nevada.