Questões ATP_pag320

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1087. The horizontal wind shear, critical for turbulence (moderate or greater) per 150 miles
is
 A. 18 knots or less.
 B. greater than 18 knots.
 C. not a factor, only vertical shear is a factor.
Horizontal wind shear can be determined from the spacing of isotachs. The horizontal
wind shear critical for turbulence (moderate or greater) is greater than 18 knots per
150 miles. 150 nautical miles is equal to 2-1/2° latitude.
1088. A squall is a sudden increase of at least 15 knots in average wind speed to a
sustained speed of
 A. 24 knots or more for at least 1 minute.
 B. 22 knots or more for at least 1 minute.
 C. 20 knots or more for at least 1 minute.
A squall (SQ) means there has been a sudden increase in wind speed of at least 15
knots to a speed of 20 knots or more, and it lasted at least one minute.
1089. Maximum turbulence potential charts (GTG-2) are issued
 A. every morning at 0400.
 B. two times a day.
 C. hourly.
The Graphical Turbulence Guidance (GTG-2) graphics are computer-generated four-
dimensional forecasts of information related to the likelihood of encountering Clear Air
Turbulence (CAT) associated with upper-level fronts and jet streams. The GTG-2
product consists of a 00, 01, 02, and 03 hour forecast, which are updated every hour,
and a 06, 09, and 12 hour forecast, which are updated every three hours, starting at
00Z. GTG-2 graphics are "snapshot" graphics, intended to depict forecasted clear air
turbulence conditions at the valid time (for example, at 1200Z), not for a valid time
range (for example, from 1200Z to 1300Z).
1090. Which type clouds are indicative of very strong turbulence?
 A. Nimbostratus.
 B. Standing lenticular.
 C. Cirrocumulus.