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WX 201 EXAM 2 QUESTIONS AND ANSWERS
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WX 201 EXAM 2 QUESTIONS AND ANSWERS
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WX 201 EXAM 2 QUESTIONS AND ANSWERSWhat are constant pressure surfaces? - Answers-Constant pressure at all points
In regard to constant pressure surfaces, where do higher heights form? - Answers-Over
warm air
In regard to constant pressure surfaces, what do high heights correspond to region
wise? - Answers-Regions of high pressure
In regard to constant pressure surfaces, what will happen to the wind if the height
gradient gets stronger? - Answers-Wind will get stronger
What height on the standard atmosphere relates to the common pressure level of
200mb? - Answers-39,000ft
How do heights on a constant pressure surface correspond to pressure features? -
Answers-By contour lines
How are the necessary data (i.e. pressure, wind, temperature, and humidity with height)
obtained for creating constant pressure charts? How often are the data obtained, and at
what times daily? - Answers-Obtained by Radiosonde Balloon launches, which are
launched daily, twice a day, at 00 and 12Z.
How do you convert from UTC to MST? - Answers-Subtract 7 from the utc time to get
your mst time
What are the six causes of vertical motion in the atmosphere? - Answers-1. Orography
(topography)
2. Fronts
3. Convection
4. Convergence/Divergence
5. Wave motion
6. Turbulence
What is convergence? - Answers-Occurs when there is more outflow from than inflow to
a region
What is divergence? - Answers-Occurs when there is more outflow from than inflow to a
region
What type of pressure change does convergence lead to? - Answers-An increase
What type of pressure change does divergence lead to? - Answers-A decrease
, What is Orographic (topographic) lifting? - Answers-Consists of upstream lifting,
upslope lifting, Lee Lifting, and convergence
What is upstream lifting? - Answers-Caused by convergence upstream from mountains
What is upslope lifting? - Answers-Caused by air being forced up a mountain slope
What is lee lifting? - Answers-Caused by convergence on the downwind side
What height on the standard atmosphere relates to the common pressure level of
250mb? - Answers-34,500ft
What height on the standard atmosphere relates to the common pressure level of
300mb? - Answers-30,000ft
What height on the standard atmosphere relates to the common pressure level of
500mb? - Answers-18,000ft
What height on the standard atmosphere relates to the common pressure level of
700mb? - Answers-10,000ft
What height on the standard atmosphere relates to the common pressure level of
850mb? - Answers-5,000ft
What are fronts? - Answers-A surface boundary between two air masses that results in
warm air rising
What is convection? - Answers-Caused by buoyancy, a lifting force proportional to
differences in air density. Occurs in unstable air. Rising air in warm plumes (bubbles)
called thermals. Thunderstorms form when humid and unstable enough
What are wave motions? - Answers-Are observed downwind from mountains or
thunderstorm systems. Called gravity waves, lee waves, and mountain waves
What is turbulence? - Answers-Overturning air motions
What are different types of turbulence? - Answers-Mechanical Turbulence, Mountain
Wave Turbulence, Thermal Turbulence, Turbulence near thunderstorms, and Clear-air
turbulence.
What is Clear-Air Turbulence? - Answers-Above and below jet streams
What is Mechanical Turbulence? - Answers-On windy days, over rough terrain
What is thermal turbulence? - Answers-From unstable air near ground
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