The Pliocene ocean was very mixed vs today, typhoons happen anywhere in the Pacific not a band in western and some in eastern, all over. This points to that, the north Pacific is very warm, the Philippines expecting their first typhoon of the year on the radar ... seems where it's going, it's mixing so the southern oscillations may not always hold anymore with an ocean warming so fast to depth, as shown by the Argos buoys. The oscillation relies on a difference in ocean temps & trade winds, we are losing that temperature contrast as the oceans warm the thesis, fits into El Limbo and the jetstream doing these radical loops due north, due south farther in total latitude instead of normal waves, that tied a warming atmosphere. Another way to check this would be longer term averages of sea-level in west vs east, if they equalize would be another indication.