Generally, prevailing winds blow east-west rather than north-south. This happens because Earth's rotation generates what is known as the Coriolis effect. The Coriolis effect makes wind systems twist counter-clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.
The reason that they most often move from west to east is due to the jet stream. ... Jet streams carry weather systems. Warmer tropical air blows toward the colder northern air. These winds shift west to east due to the rotation of the earth.
Low pressure spins counterclockwise, causing weather systems to move from west to east in the Northern Hemisphere.
This is due to lower air pressure further North America than in the tropics. Since low-pressure systems spin counterclockwise, winds move from the west to the east.
Prevailing weather results from expansive convection currents formed by the temperature differences on the surface of the earth as latitude increases. The Coriolis effect adds the twist.
I got this from a few sites so use this information as you want and be careful <3
