# Why does Coriolis force act on North-South moving air?

Earth's axis is North-South; then why does air moving towards or away from North or South experience Coriolis force, since $\vec\omega\times \vec v$ will be 0 in this case?

• Because "north/south" is a different direction depending on where you are? If you're looking at a globe, 'north' at the equator points up to the ceiling. But north near the north pole is almost horizontal. Jul 24, 2016 at 17:25
• To elaborate: $\vec{\omega}$ points towards the North Celestial Pole, not north along the Earth's surface. Jul 25, 2016 at 18:03