Numerous reports this morning that Pacific will leave the Big West Conference to become the 10th member of the WCC, effective in the 2013-14 season. The move could become official as early as this afternoon.
The WCC's membership was stable for three decades before BYU joined the conference last season. With BYU, the nine-team conference had unavoidable scheduling issues (split home-away weeks, Monday games, etc.). Conferences with even-numbered membership typically have smoother scheduling models.
Pacific was a member of the West Coast Athletic Conference (which changed its name to the WCC in 1989) from 1952-71.