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LEVEL: noun; a particular altitude

Ex. There is too much turbulence at this level; let's go up a couple of thousand feet.
Ex. There are a few low-level clouds but that's all.
OCCUPANT(S): noun; the person(s) in a vehicle, aircraft, building, area, etc.
Ex. The aircraft was damaged when it landed, but none of the occupants were hurt.
NOTE: verb; occupy

REACTION: noun; an action produced as a result of another action
Ex. Turbulence that affects a small aircraft may produce no

reaction in a large, heavy aircraft.
ROTOR CLOUD: noun; a ball-shaped cloud that sometimes forms near a line of mountains
Ex. Rotor clouds and standing lenticular clouds are signs of severe turbulence.
SHEAR: noun; a tearing or breaking effect produced by force moving

in one direction against a stationary object, or an object moving in the opposite
direction
Ex. You can see on the piece of metal that it is breaking as a result of shear caused by
too much weight.

NOTE: verb; shear
Ex. When the truck went off the road it sheared the tree off right at the surface of
the ground.

THERMAL: adjective; caused by heat, or dealing with heat
Ex. Hot air rising is sometimes called a thermal current.

UPWIND: adjective or adverb; a position from an object so that wind
blows from that position to the object

Ex. You won't find much turbulence when you are upwind from the obstruction.
VORTEX, VORTICES: noun; a current that flows in a spiral

Ex. Water forms a vortex in a container when it drains from a hole in the bottom of
the container.

Ex. The wind flowing over and around the wing tips creates vortices behind the
aircraft.
WAKE: noun; the disturbance in a fluid (liquid or air) caused by an

object moving through the fluid
Ex. You can see the wake behind the boat. Ex. the aircraft leaves a wake behind it as it
moves through the air.