It may be NW-SE, SW-NE, or just W-E, but it’s almost always this way. Why not E-W?
In: 10
In between the 30 and 60 degree latitudes (includes most of the US), the dominant winds are from the West towards the East, so the storms (and other meteorological structures follow that). The 30 and 60 degrees are averages, it can be sometime higher or lower.
Below the 30 degrees and above 60 degrees, the dominant winds are in the opposite direction. Higher than 60 degrees, there is one permanent vortex which is typically centered on the pole. Below 30 degrees, storms go towards the East because of the dominant winds.
Big storms (hurricanes for example) go towards the poles because of the Coriolis force. Smaller storms tend to still go towards the pole most of the time, but can go towards the equator sometime.
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