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
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
