I believe the jet stream and the Japanese ocean currents push the weather up and down from the east to the west from eastern Asia up towards Alaska and then down the west coast towards us
The southern hemisphere weather from S America push the weather from Anarctica north colliding with the weather pushed down from the north.
The weather here in central Oregon doesn't follow the normal results, I have been told we are in a convergence zone, some weather comes down from the gulf of Alaska and some comes up from the coast of California, depending on which front has the most pressure