Definition
The predictable way that wingtip vortices generated by an aircraft move and dissipate after they are produced. Vortices trail behind and below the generating aircraft, sink at roughly 200 to 500 feet per minute, level off about 500 to 900 feet below the flight path, and tend to drift laterally with the wind. They persist longest in light winds and calm conditions and are strongest when the generating aircraft is heavy, clean (flaps and gear up), and slow.
Plain English
How the spinning columns of air left behind by a larger aircraft move, sink, and drift after they form -- which tells you where they will be and how long they will be a hazard.
Context Anchor
Seen in wake turbulence discussions, especially when taking off, landing, or following another aircraft near an airport.
Derivation
Vortex comes from the Latin vortex/vertex, meaning a whirling mass or whirlpool. Behavior simply means how something acts. Together it describes the consistent pattern these whirling air masses follow, which is what makes them possible to avoid.
Why Pilots Care
Recognizing how vortices move and persist helps pilots time separations and avoid dangerous wake encounters.
Grounding Statement
Vortices behave like invisible, slowly sinking horizontal tornadoes that drift with the wind until they break up.
Intuition Check
Vortex behavior does not mean the air moves randomly. In aviation, it means the usual, predictable way wingtip vortices move and weaken after an aircraft passes.
Example Sentence 1
Because of typical vortex behavior, the pilot stayed above the heavy jet's flight path and touched down beyond its touchdown point.
Example Sentence 2
A light crosswind shifted the vortex behavior so one trail moved away from the runway edge.