Definition
The horizontal and vertical movement of air in the atmosphere. Wind refers primarily to horizontal air motion across the Earth's surface, while currents refer to vertical air motion (rising or descending air). Together they describe how air moves in three dimensions and directly affect aircraft performance, handling, and flight planning.
Plain English
Wind is air moving sideways across the ground. Currents are air moving up or down. Pilots have to deal with both, because air moves in every direction, not just one.
Context Anchor
You encounter this term in weather study, preflight planning, takeoff and landing decisions, and while correcting the airplane’s path in flight.
Derivation
Wind' comes from Old English 'wind,' meaning moving air. 'Current' comes from Latin 'currere,' to run or flow -- the same root as 'course' and 'occur.' A current is air that is 'running' in a particular direction, which is why the word is used for vertical air movement just as it is for flowing water.
Why Pilots Care
These movements change groundspeed, fuel use, takeoff and landing distances, and can create unexpected turbulence or drift.
Analogy
Think of an airplane like a boat moving through a river. The boat moves through the water, but the moving water also carries the boat. An airplane moves through air, and moving air can carry the airplane the same way.
Grounding Statement
Air is a fluid that moves in every direction. 'Wind and currents' is the pilot's shorthand for that full three-dimensional motion -- sideways and up-down.
Intuition Check
Do not think of wind and currents only as something you feel standing outside. In aviation, they are moving air that can change where the airplane goes and how it performs, even when the air looks clear.
Example Sentence 1
Chapter 12 covers wind and currents, explaining how horizontal winds and vertical air movement both shape the conditions a pilot will encounter.
Example Sentence 2
Strong wind and currents near a front can produce turbulence that requires slowing to maneuvering speed.