I live in close proximity to LAX, and can observe aircraft as they approach from the north. Typically, the routing is Fillmore, Santa Monica, then vectors to (usually) the 24 complex, sometimes the 25s. However, there have been occasions whereby upon reaching SMO, the aircraft flies about a 100 heading. This routing takes the aircraft over the 24/25 approaches at 7000' descending and has said planes doing a south downwind to LAX.
What condition(s) dictate this?