Definition
The pair of counter-rotating, horizontal tornado-like air masses trailing behind an aircraft's wingtips, generated as a by-product of producing lift. The vortices form because higher-pressure air beneath the wing spills around the wingtip into the lower-pressure area above, creating spiraling air that persists behind the aircraft. Vortex strength increases with aircraft weight and decreases with airspeed and wingspan, so the strongest wakes come from heavy, slow, clean-configuration aircraft.
Plain English
The two spinning rolls of disturbed air left behind by a flying aircraft's wingtips. They are invisible, can be very powerful behind larger aircraft, and can upset or roll a smaller aircraft that flies into them.
Context Anchor
Seen in wake turbulence discussions, especially during takeoff, landing, and when following another aircraft.
Derivation
Vortex comes from the Latin vortex/vertex meaning 'a whirling mass' or 'whirlpool.' Wake originally referred to the trail of disturbed water left behind a moving ship. Together, 'vortex wake' literally describes a whirling, disturbed trail left in the air behind an aircraft -- the airborne equivalent of a ship's wake, but spinning.
Why Pilots Care
These vortices can induce sudden roll or loss of control in following aircraft, making separation distances critical for safety.
Grounding Statement
Picture an airplane leaving two invisible, rolling trails of air behind it as it flies.
Intuition Check
Do not think of vortex wake as just random rough air behind an aircraft. It is organized, rolling air that can persist and move after the aircraft has passed.
Example Sentence 1
The tower instructed the Cessna to hold short for two minutes to allow the heavy jet's vortex wake to dissipate before takeoff.
Example Sentence 2
During final approach the instructor pointed out the visible wingtip vortices forming the vortex wake of the aircraft ahead.