Water levels actually dip below sea level near Australia, and as the pile traverses the Pacific, waters rise in the east near South America. An oscillation is a reverberation back and forth between two states, like between summer and winter. Back and forth, east and west, this cycle has run continuously for many thousands of years. Signs can be read in Arizona tree rings and Himalayan ice-core layers. The answer is hidden in the laws of probability.
Climate science is all about understanding probabilities.
Scientists can, however, assign probabilities to its possible effects. There's a 60 percent chance of double the normal rainfall, and a 10 percent chance of triple. There's a 70 percent chance the answer is yes. There's over a 95 percent chance that the answer is yes-a virtual certainty. If you want to be trendy, you can say this is because Earth's weather machinery is chaotic, a property of many natural systems which unfold in mysterious and complex ways.