ERAU WX-201
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ERAU WX 201 8
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ERAU WX-201 75
Latest notes & summaries ERAU WX-201
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WX 201 Final Exam Question Bank with correct Answers 
The most abundant gases in Earth's atmosphere by volume are 
nitrogen and oxygen 
 
 
Which of the following is considered a variable gas in Earth's atmosphere? 
water vapor 
 
 
The only substance near Earth's surface that is found naturally in the current atmosphere as a solid, liquid, and a gas is 
water 
 
 
Which weather element ALWAYS decreases as we climb upward in the atmosphere? 
pressure 
 
 
Earth's atmosphere is divided into n...
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WX 201 Final Exam Question Bank with correct Answers 
The most abundant gases in Earth's atmosphere by volume are 
nitrogen and oxygen 
 
 
Which of the following is considered a variable gas in Earth's atmosphere? 
water vapor 
 
 
The only substance near Earth's surface that is found naturally in the current atmosphere as a solid, liquid, and a gas is 
water 
 
 
Which weather element ALWAYS decreases as we climb upward in the atmosphere? 
pressure 
 
 
Earth's atmosphere is divided into n...
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WX 201 Final ERAU Exam Questions and Answers 
The Atmosphere 
aerosol (a.k.a. particulates) 
rain, drizzle, fog, snow, ice crystals, cloud droplets 
 
 
Permanent gas 
Nitrogen [N2]=78% 
Oxygen [02]=21% 
Others (Ar, Ne, He, Kr, H)=1% 
 
 
Variable gas 
[H2O] 
-0 to 4% (highly variable) 
-Most abundant variable gas• 
[CO2] 
-0.039% and rising 
[O3] 
-Highly variable, reactive gas 
-Upper atmosphere: protects life from UV light 
-Occurs naturally, absorbs harmful ultraviolet light from sun 
 
 
...
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WX 201 Final ERAU Exam Questions and Answers 
The Atmosphere 
aerosol (a.k.a. particulates) 
rain, drizzle, fog, snow, ice crystals, cloud droplets 
 
 
Permanent gas 
Nitrogen [N2]=78% 
Oxygen [02]=21% 
Others (Ar, Ne, He, Kr, H)=1% 
 
 
Variable gas 
[H2O] 
-0 to 4% (highly variable) 
-Most abundant variable gas• 
[CO2] 
-0.039% and rising 
[O3] 
-Highly variable, reactive gas 
-Upper atmosphere: protects life from UV light 
-Occurs naturally, absorbs harmful ultraviolet light from sun 
 
 
...
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WX 201 Exam 3 with correct Answers 
The contour lines drawn on a 500 mb chart are lines of constant 
height 
 
 
The unit of pressure most commonly found on a surface weather map is 
millibars or hectopascals 
 
 
Isobaric surfaces are ____ in warm, less-dense air and ____in cold, more-dense air. 
higher; lower 
 
 
Because of friction, surface winds move ____ winds aloft with the same pressure gradient. 
more slowly than 
 
 
The pressure gradient force is directed from higher pressure toward l...
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WX 201 Exam 3 with correct Answers 
The contour lines drawn on a 500 mb chart are lines of constant 
height 
 
 
The unit of pressure most commonly found on a surface weather map is 
millibars or hectopascals 
 
 
Isobaric surfaces are ____ in warm, less-dense air and ____in cold, more-dense air. 
higher; lower 
 
 
Because of friction, surface winds move ____ winds aloft with the same pressure gradient. 
more slowly than 
 
 
The pressure gradient force is directed from higher pressure toward l...
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WX 201 Exam 3 with correct Answers Graded A+ 
The land/sea breeze, lake, breeze, and mountain/valley breeze are examples of 
thermal circulations 
 
 
Longwaves in the middle and upper troposphere usually have lengths on the order of 
thousands of kilometers 
 
 
in the Northern Hemisphere, air found to the north of the polar front is______, while air further south is____ 
cold; warm 
 
 
the air mass with the highest actual water vapor content is 
mT 
 
 
because of friction, the surface winds ...
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WX 201 Exam 3 with correct Answers Graded A+ 
The land/sea breeze, lake, breeze, and mountain/valley breeze are examples of 
thermal circulations 
 
 
Longwaves in the middle and upper troposphere usually have lengths on the order of 
thousands of kilometers 
 
 
in the Northern Hemisphere, air found to the north of the polar front is______, while air further south is____ 
cold; warm 
 
 
the air mass with the highest actual water vapor content is 
mT 
 
 
because of friction, the surface winds ...
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WX 201 Exam 3 w- HW 16 and 17 Questions and Answers 
Due to Hadley cell formation and the Coriolis force in both hemispheres, winds aloft flow 
 
a. easterly 
b. southerly 
c. westerly 
d. randomly 
e. northerly 
C 
 
 
Which air mass woudl show the most dramatic change in both temperature and moisture content as it moves over a large body of very warm water? 
 
a. mA in winter 
b. mP in winter 
c. cP in winter 
d. cT in summer 
e. mT in summer 
C 
 
 
If you are standing directly south of a smo...
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WX 201 Exam 3 w- HW 16 and 17 Questions and Answers 
Due to Hadley cell formation and the Coriolis force in both hemispheres, winds aloft flow 
 
a. easterly 
b. southerly 
c. westerly 
d. randomly 
e. northerly 
C 
 
 
Which air mass woudl show the most dramatic change in both temperature and moisture content as it moves over a large body of very warm water? 
 
a. mA in winter 
b. mP in winter 
c. cP in winter 
d. cT in summer 
e. mT in summer 
C 
 
 
If you are standing directly south of a smo...
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WX 201 Exam 3 Study Guide with complete solutions 
What is a cloud? 
a volume of atmosphere containing numerous water droplets and/or ice particles 
 
 
What ingredients are necessary for cloud development? 
-Abundant water vapor 
-Condensation nuclei particles 
-A cooling mechanism 
 
 
What is supercooled water? At what temperature does it exist, and how does it freeze? 
Cloud drops that remain liquid down to -40 degrees Celcius. May freeze when the temperature decreases, encounters an ice nuc...
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WX 201 Exam 3 Study Guide with complete solutions 
What is a cloud? 
a volume of atmosphere containing numerous water droplets and/or ice particles 
 
 
What ingredients are necessary for cloud development? 
-Abundant water vapor 
-Condensation nuclei particles 
-A cooling mechanism 
 
 
What is supercooled water? At what temperature does it exist, and how does it freeze? 
Cloud drops that remain liquid down to -40 degrees Celcius. May freeze when the temperature decreases, encounters an ice nuc...
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WX 201 Exam 3 HW #1 & 2 Questions and Answers 
Upper-level winds in the middle latitudes of both hemispheres generally blow from ____. 
The west 
 
 
The pressure gradient force is directed from higher pressure toward lower pressure 
at all places on Earth. 
 
 
The Coriolis force acts at a ____ degree angle to the wind. 
90 
 
 
On a 500 millibar chart, ____ are drawn to represent horizontal changes in altitude which correspond to horizontal changes in pressure. 
Contour Lines 
 
 
The surface ...
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WX 201 Exam 3 HW #1 & 2 Questions and Answers 
Upper-level winds in the middle latitudes of both hemispheres generally blow from ____. 
The west 
 
 
The pressure gradient force is directed from higher pressure toward lower pressure 
at all places on Earth. 
 
 
The Coriolis force acts at a ____ degree angle to the wind. 
90 
 
 
On a 500 millibar chart, ____ are drawn to represent horizontal changes in altitude which correspond to horizontal changes in pressure. 
Contour Lines 
 
 
The surface ...
![Latest Preview Thumbnail](/docpics/5254965/663e05fe7b4f1_5254965_121_171.jpeg)
WX 201 Exam 2 with correct Answers Graded A+ 
At what time of day is the relative humidity normally at a minimum? 
when the air temperature is highest 
 
 
The time of day when the relative humidity reaches a maximum value is usually 
at the time when the air temperature is lowest. 
 
 
The instrument that measures humidity by measuring the amount of radiant energy absorbed by water vapor is the 
infrared hygrometer. 
 
 
The relationship between the mass of water vapor in an air parcel and the ...
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WX 201 Exam 2 with correct Answers Graded A+ 
At what time of day is the relative humidity normally at a minimum? 
when the air temperature is highest 
 
 
The time of day when the relative humidity reaches a maximum value is usually 
at the time when the air temperature is lowest. 
 
 
The instrument that measures humidity by measuring the amount of radiant energy absorbed by water vapor is the 
infrared hygrometer. 
 
 
The relationship between the mass of water vapor in an air parcel and the ...
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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 re...
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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 re...
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WX 201 Exam 2 with correct Answers (Graded A) 
Dew is most likely to form on 
clear, calm nights 
 
 
Which two clouds can produce precipitation? 
cumulonimbus and nimbostratus 
 
 
If fog is forming in Denver, Colorado (located on the eastern side of the Rocky Mountains), and the wind is blowing from the east, then the fog is most likely 
upslope fog 
 
 
On a cold, winter morning, the most likely place for radiation fog to form is 
in a valley 
 
 
As Apollo 12 ascended into the atmosphere, th...
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WX 201 Exam 2 with correct Answers (Graded A) 
Dew is most likely to form on 
clear, calm nights 
 
 
Which two clouds can produce precipitation? 
cumulonimbus and nimbostratus 
 
 
If fog is forming in Denver, Colorado (located on the eastern side of the Rocky Mountains), and the wind is blowing from the east, then the fog is most likely 
upslope fog 
 
 
On a cold, winter morning, the most likely place for radiation fog to form is 
in a valley 
 
 
As Apollo 12 ascended into the atmosphere, th...