Wind influences precipitation patterns. Wind could be warm or cool, humid or dry. As they go over the mountains, they could get cooler and cooler until they could not anymore hold moisture that is when it precipitates and distributes water call shower. The cycle repeats itself and the wind is never cancelled out of the equation. The process repeats itself, it is a cycle.
It's because underneath the pacific rim is tectonic plates that move causing earthquakes, active volcanoes, or both.
