Questões ATP_pag318

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C. Embedded thunderstorms.
A layer of stratiform clouds may sometimes form in a mildly stable layer while a few
convective clouds penetrate the layer thus merging stratiform with cumuliform. Under
the right conditions, the cumuliform clouds can become thunderstorms which are
completely obscured by the surrounding stratus clouds.
Answer (A) is incorrect because the formation of freezing rain is dependent on rain
falling through colder air. Convective clouds that penetrate a stratus layer may or may
not produce precipitation. Answer (B) is incorrect because clear air turbulence is
turbulence encountered in air where no clouds are present.
1081. A station is forecasting wind and temperature aloft to be 280° at 205 knots;
temperature -51°C at FL390. How would this data be encoded in the FB?
 A. 7800-51.
 B. 789951
 C. 280051
FB forecasts of wind speeds from 100 knots through 199 knots have 50 added to the
wind direction code and 100 subtracted from the speed. Winds over 200 knots are
coded as 199 knots. A wind of 280° at 205 knots with a temperature of -51°C is coded
as '789951.'
Answer (A) is incorrect because it indicates a wind at 280° at 100 knots. The minus
sign is to be omitted above 24,000 feet MSL. Answer (C) is incorrect because if the
wind is 0 knots, the direction and wind group is coded '9900.'
1082. What type turbulence should be reported when it momentarily causes slight, erratic
changes in altitude and/or attitude, one-third to two-thirds of the time?
 A. Occasional light chop.
 B. Moderate chop.
 C. Intermittent light turbulence.
This description meets the criteria for intermittent light turbulence.
Answer (A) is incorrect because light chop does not cause any appreciable changes
in altitude and/or attitude, and occasional is less than one-third of the time. Answer
(B) is incorrect because moderate chop does not cause any appreciable changes in
altitude and/or attitude.
1083. METAR KHRO 131753Z 09007KT 7SM FEW020 BKN040 30/27 A3001.
SPECI KHRO 131815Z 13017G26KT 3SM +TSRA SCT020 BKN045TCU 29/24
A2983 RMK
RAB12 WS TKO LDG RW14R FRQ LTGICCG VC.
What change has taken place between 1753 and 1815 UTC at Harrison (KHRO)?
 A. The ceiling lowered and cumulonimbus clouds developed.
 B. Thundershowers began at 12 minutes past the hour.