Wind: The air at the equator is hot and the at the poles is cold, when warm air rushes cold air rushes in to fill the empty space. We call this wind. In Ontario our prevailing winds come from the west.
Air Masses: Large body of air, Warm masses from the equator, Cold masses from the poles, Air masses that come from over water tend to be warm and wet. When cold and warm air masses meet, The warm air is forced up the air rushes in to fill the space, the warm cool, condense, and precipitate. The rotation of the earth causes air masses to spin. Because the equator is moving faster than any other part of the planet. If air is moving North away from the equator it will veer to the East because its travelling slightly faster than the Earth is keeping it. So hurricanes or storm systems in the Northern Hemisphere usually spin counterclockwise.
