Suppose it isn't a cycle as such…. …
Water (warmer than normal) in the eastern tropical Pacific Ocean marks an El Niño. The atmosphere is heated and more convection and precipitation that normal occurs.
The anticyclones block the normal west-to-east flow of air in the middle latitudes, and forms a train of atmospheric waves denoted by high and low pressure centres typical of thundery weather.
Due von Karman vortice wave train behaviour, this system curves north-eastward. The so called anomalies form in El Niño once the North Pacific tropical cyclone season ends (November to April).
An anomalous low pressure centre forms in the Gulf of Alaska, and a ridge of high pressure establishes over central and western Canada and the jet stream alters course.