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3. Select words from the list below to complete the following sentences.

Some of the words may be used more than once, and you may have to
make the word plural or change the tense. Do not try to write the words in the
spaces.
leeward vortices windward

rotor cloud wake
vortex wave

a. When standing lenticular clouds and small round ___________ occur in a
downwind area they are signs of severe turbulence.
b. A spiral-shaped current is often called a _______________ .

c. The town is south of the mountain, that means it is on the ___________ side
when a northwind blows.

d. The turbulence produced by a moving aircraft is a special kind of mechanical
turbulence __________ called turbulence.
e. The wingtips of a moving aircraft produce two __________ of air that extend
behind the aircraft.

f. High-speed winds blowing across a mountain can create __________ currents
that extend far above the mountain.

g. There should be much less turbulence on the _____________ side of an obstacle.
h. Large, fast-moving vehicles disturb the air as they move. Even though it is
invisible, they leave a ___________ of air behind them

i. Downwind and ___________ refer to the same position, and upwind and
____________ also have the same general meaning.

j. Strong upward and downward currents called ___________ often form to the
leeward of mountains when strong, winds are blowing:
k. Lenticular clouds and ______________form on the leeward side of the mountains