Cold air comes from the poles and warm air comes from the equator, wind systems spin because the earth is rotating on its axis, Much of the warm air masses come from the over water because water holds heat better than land, so the wind systems are like energy distribution system they balance out of the atmosphere by redistributing heat from equator and cold form poles. When cold air meets warm air it is forced up because cold air is more dense, the warm air will cool, condense and rain. The equator is rotating at 1600km/h, it is spinning faster than any other latitude. As you move away from the equator your rotational speed slows down. This means that wind traveling sway from the equator toward the North will veer to the East as it is traveling faster than the earth beneath it. This is why storm systems spin in a circle
