How does the Coriolis effect influence wind direction?

The Coriolis effect is a pseudo-force caused by Earth's rotation that deflects moving air and water. Instead of flowing directly from high to low pressure, winds are deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. This horizontal deflection shapes large-scale atmospheric circulation patterns, ocean currents, and storms.

What we know

• The Coriolis force acts as a pseudo-force on objects in motion within a frame of reference that rotates with respect to an inertial frame. [1, 2]
• Moving objects on Earth's surface are deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. [2]
• Rather than flowing directly from high pressure to low pressure areas, winds tend to flow to the right of this direction north of the equator and to the left south of it. [2]
• The horizontal deflection effect is greatest near the poles and decreases to zero at the equator. [2]

Where to go next

• how it workedWhat is the geostrophic wind in meteorology?
• a case in pointHow do trade winds form across the globe?
• the bigger pictureWhat are prevailing winds and how do they work?
• whoWho was Gaspard-Gustave de Coriolis?
• what caused itHow does friction alter near-surface wind direction?
• an unexpected connectionHow water wheels led to understanding the Coriolis forceThe mathematical expression for the Coriolis force was originally derived in connection with the theory of water wheels.

Sources

• [1]Coriolis force (Wikidata Q169973) · CC0 1.0
• [2]Coriolis force · CC BY-SA 4.0
• [3]Trade winds · CC BY-SA 4.0
• [4]Prevailing winds · CC BY-SA 4.0
• [5]Geostrophic wind · CC BY-SA 4.0