Family court judges consider child custody matters with one parent moving out of the area to be the most difficult. This obviously will complicate relations between the children and the non-custodial parent. This is in part because day-to-day participation in the child's life has also become more difficult.
There are a large number of these kinds of situations in California. While a large number of people move to California from other locations, there is also a good chance that these individuals will move away at some point as well. That's not to say that these circumstances are reserved for our state alone. It all reflects a greater trend of a more mobile population due to the type of economy we now have in place.