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WX 201 Exam 2 with correct Answers

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WX 201 Exam 2 with correct Answers What are constant pressure surfaces? Constant pressure at all points In regard to constant pressure surfaces, where do higher heights form? Over warm air In regard to constant pressure surfaces, what do high heights correspond to region wise? Regions of high pressure In regard to constant pressure surfaces, what will happen to the wind if the height gradient gets stronger? Wind will get stronger What height on the standard atmosphere relates to the common pressure level of 200mb? 39,000ft What height on the standard atmosphere relates to the common pressure level of 250mb? 34,500ft What height on the standard atmosphere relates to the common pressure level of 300mb? 30,000ft What height on the standard atmosphere relates to the common pressure level of 500mb? 18,000ft What height on the standard atmosphere relates to the common pressure level of 700mb? 10,000ft What height on the standard atmosphere relates to the common pressure level of 850mb? 5,000ft How do heights on a constant pressure surface correspond to pressure features? 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? Obtained by Radiosonde Balloon launches, which are launched daily, twice a day, at 00 and 12Z. How do you convert from UTC to MST? Subtract 7 from the utc time to get your mst time What are the six causes of vertical motion in the atmosphere?

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WX 201 Exam 2 with correct Answers
What are constant pressure surfaces?
Constant pressure at all points


In regard to constant pressure surfaces, where do higher heights form?
Over warm air


In regard to constant pressure surfaces, what do high heights correspond to region wise?
Regions of high pressure


In regard to constant pressure surfaces, what will happen to the wind if the height gradient gets
stronger?
Wind will get stronger


What height on the standard atmosphere relates to the common pressure level of 200mb?
39,000ft


What height on the standard atmosphere relates to the common pressure level of 250mb?
34,500ft


What height on the standard atmosphere relates to the common pressure level of 300mb?
30,000ft


What height on the standard atmosphere relates to the common pressure level of 500mb?
18,000ft


What height on the standard atmosphere relates to the common pressure level of 700mb?
10,000ft


What height on the standard atmosphere relates to the common pressure level of 850mb?
5,000ft


How do heights on a constant pressure surface correspond to pressure features?
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?
Obtained by Radiosonde Balloon launches, which are launched daily, twice a day, at 00 and 12Z.


How do you convert from UTC to MST?
Subtract 7 from the utc time to get your mst time


What are the six causes of vertical motion in the atmosphere?

, 1. Orography (topography)
2. Fronts
3. Convection
4. Convergence/Divergence
5. Wave motion
6. Turbulence


What is convergence?
Occurs when there is more outflow from than inflow to a region


What is divergence?
Occurs when there is more outflow from than inflow to a region


What type of pressure change does convergence lead to?
An increase


What type of pressure change does divergence lead to?
A decrease


What is Orographic (topographic) lifting?
Consists of upstream lifting, upslope lifting, Lee Lifting, and convergence


What is upstream lifting?
Caused by convergence upstream from mountains


What is upslope lifting?
Caused by air being forced up a mountain slope


What is lee lifting?
Caused by convergence on the downwind side


What are fronts?
A surface boundary between two air masses that results in warm air rising


What is convection?
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?
Are observed downwind from mountains or thunderstorm systems. Called gravity waves, lee waves,
and mountain waves


What is turbulence?
Overturning air motions

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