This apparent deflection is the Coriolis effect. The wind is like the ball. It appears to bend to the right in the Northern Hemisphere. In the Southern Hemisphere, winds appear to bend to the left. In the Northern Hemisphere, wind from high-pressure systems pass low-pressure systems on the right. read more
The Coriolis effect is caused by a combination of the inertia of moving air and the rotation of the Earth. Air tends to move from high pressure to low pressure in a straight line, but the rotation of the Earth means that, to an observer at one spot on its surface, the moving air appears to turn. This effect increases as the air moves faster. read more
High pressure over poles (caused by sinking cold dense air) causes the air to blow away from the poles toward 60 latitude. Planetary wind shift because the earth goes through seasons throughtout the year, wind belts can shift slightly. read more
The cause of Coriolis effect is the Earth's rotation and the massof inertia. The deflection effects the direction of moving bodieson earth surface. read more