Planetary winds are the flow of a whole tear from one latitude to another due to differences in air pressure. There are three types of planetary winds – westerly winds and easterly and polar easterlies.
- In the Northern Hemisphere, high-pressure subtropical to pole winds is deflected to the right and therefore blow from the southwest.
- In the Southern Hemisphere, these winds deflect to the left and blow from the northwest, hence these winds are called westerly winds.
- Westerly winds below the high-pressure subtropical areas towards the low-pressure equatorial regions. These are also called trade winds.
- Since easterlies blow mainly from the east, they are also called tropical easterlies.
- These winds move from the polar regions to the sub-polar low-pressure areas.
- The direction of these winds is from North-East to South-West in the Northern Hemisphere and from South-East to North-West in the Southern Hemisphere.