Questões ATP_pag326

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B. The jetstream is located south of the low and warm front.
 C.
The jetstream is located over the low and crosses both the warm front and the cold
front.
Development of a surface low is usually south of the jet stream. As the low deepens, it
moves nearer the jet center. When a low occludes, the jet stream usually crosses the
frontal system at the point of the occlusion.
Answer (B) is incorrect because the jet stream is located to the north of the low and
warm front. Answer (C) is incorrect because the jet stream crosses the occlusion of
the warm and cold front at the point of occlusion.
1109. Which process causes adiabatic cooling?
 A. Expansion of air as it rises.
 B. Movement of air over a colder surface.
 C. Release of latent heat during the vaporization process.
When air expands, it cools; and when compressed, it warms. These changes are
adiabatic, meaning that no heat is removed from or added to the air.
Answer (B) is incorrect because adiabatic cooling means that no heat is removed from
the air, as would be the case if the air was moved over a colder surface. Answer (C) is
incorrect because adiabatic cooling is the process in which no heat is removed from
or added to the air.
1110. What is a feature of supercooled water?
 A. The water drop sublimates to an ice particle upon impact.
 B. The unstable water drop freezes upon striking an exposed object.
 C.
The temperature of the water drop remains at 0°C until it impacts a part of the
airframe, then clear ice accumulates.
Rain or drizzle is always formed in temperatures which are above freezing. Rain
falling through colder air may become supercooled, freezing on impact as freezing
rain.
Answer (A) is incorrect because sublimation is the process of changing water vapor to
ice crystals (not liquid water to ice). Answer (C) is incorrect because supercooled
water temperature is below 0°C.
1111. Maximum downdrafts in a microburst encounter may be as strong as
 A. 8,000 ft/min.
 B. 7,000 ft/min.
 C. 6,000 ft/min.
The downdrafts can be as strong as 6,000 feet per minute. Horizontal winds near the
surface can be as strong as 45 knots resulting in a 90-knot shear across the
microburst.