ERAU WX-201
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WX 201 Exam 2 with correct Answers (Graded A) 
Reflectivity 
 
 
attenutation 
absorption of radiation by targets 
 
 
WSR-88D 
Weather Surveillance Radar 1988 Doppler, detects precip and atmospheric movement 
 
 
Doppler 
ability to detect the "shift in the phase" of an energy pulse 
 
 
aircraft radar 
less precise than WSR-88D 
 
 
ground radar 
elevated to avoid terrain, raises elevation angle 1 degree every 360 degree scan, probably wont give you full picture of scan, cone of silence wher...
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WX 201 Exam 2 with correct Answers (Graded A) 
Reflectivity 
 
 
attenutation 
absorption of radiation by targets 
 
 
WSR-88D 
Weather Surveillance Radar 1988 Doppler, detects precip and atmospheric movement 
 
 
Doppler 
ability to detect the "shift in the phase" of an energy pulse 
 
 
aircraft radar 
less precise than WSR-88D 
 
 
ground radar 
elevated to avoid terrain, raises elevation angle 1 degree every 360 degree scan, probably wont give you full picture of scan, cone of silence wher...
WX 201 Exam 2 with correct Answers (Graded A) 
Generally, the concentration of condensation nuclei is greater over the oceans than over land. 
False 
 
 
If a city receives 24 inches of snow, it is the equivalent to 18 inches of rain. 
False 
 
 
An important factor in the production of rain by the collision-coalescence process is the number of ice crystals in the cloud. 
False 
 
 
In a cloud composed of water droplets and ice crystals, the saturation vapor pressure is less over the droplets th...
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WX 201 Exam 2 with correct Answers (Graded A) 
Generally, the concentration of condensation nuclei is greater over the oceans than over land. 
False 
 
 
If a city receives 24 inches of snow, it is the equivalent to 18 inches of rain. 
False 
 
 
An important factor in the production of rain by the collision-coalescence process is the number of ice crystals in the cloud. 
False 
 
 
In a cloud composed of water droplets and ice crystals, the saturation vapor pressure is less over the droplets th...
WX 201 Exam 2 with correct Answers (Graded A) 
Analysis Chart 
Depict actual data obtained at a given observation time 
 
 
Forecast Chart 
Computer model charts predicting future conditions of the atmosphere; surface charts and upper level charts are created 
 
 
Constant altitude charts 
All locations at the same altitude above ground level (for surface analysis, pressures are typically adjusted to MSL) 
 
 
Constant pressure charts 
all locations on the chart have the same pressure; contour l...
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WX 201 Exam 2 with correct Answers (Graded A) 
Analysis Chart 
Depict actual data obtained at a given observation time 
 
 
Forecast Chart 
Computer model charts predicting future conditions of the atmosphere; surface charts and upper level charts are created 
 
 
Constant altitude charts 
All locations at the same altitude above ground level (for surface analysis, pressures are typically adjusted to MSL) 
 
 
Constant pressure charts 
all locations on the chart have the same pressure; contour l...
WX 201 Exam 2 with correct Answers (Graded A) 
large raindrops fall _____ smaller raindrops; and have ______terminal velocity than/as small raindrops 
 
a. slower than; a greater 
b. faster than; a greater 
c. faster than; a lesser 
d. at the same rate as; the same 
e. slower than; a lesser 
B 
 
 
the most likely time for an ordinary thunderstorm to form is 
 
a. just before sunrise 
b. late afternoon 
c. just after sunrise 
d. around midnight 
e. at noon 
B 
 
 
The region of a cloud where onl...
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WX 201 Exam 2 with correct Answers (Graded A) 
large raindrops fall _____ smaller raindrops; and have ______terminal velocity than/as small raindrops 
 
a. slower than; a greater 
b. faster than; a greater 
c. faster than; a lesser 
d. at the same rate as; the same 
e. slower than; a lesser 
B 
 
 
the most likely time for an ordinary thunderstorm to form is 
 
a. just before sunrise 
b. late afternoon 
c. just after sunrise 
d. around midnight 
e. at noon 
B 
 
 
The region of a cloud where onl...
WX 201 Exam 2 with correct Answers (Graded A) 
An unsaturated air parcel cools or warms at what rate? 
Dry adiabatic lapse rate (DALR) 
 
 
A saturated air parcel cools or warms at which rate? 
Moist adiabatic rate (MALR) 
 
 
If the environmental lapse rate is greater than the dry adiabatic rate, the atmosphere is: 
Absolutely unstable 
 
 
Surface cooling and warm air advection aloft generally do what to the atmosphere? 
Make it more stable 
 
 
An air parcel starts to rise freely when it firs...
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WX 201 Exam 2 with correct Answers (Graded A) 
An unsaturated air parcel cools or warms at what rate? 
Dry adiabatic lapse rate (DALR) 
 
 
A saturated air parcel cools or warms at which rate? 
Moist adiabatic rate (MALR) 
 
 
If the environmental lapse rate is greater than the dry adiabatic rate, the atmosphere is: 
Absolutely unstable 
 
 
Surface cooling and warm air advection aloft generally do what to the atmosphere? 
Make it more stable 
 
 
An air parcel starts to rise freely when it firs...
WX 201 Exam 2 with correct Answers (Graded A) 
____ is a condition in which the environmental lapse rate is equal to the dry adiabatic rate. 
Neutral stability 
 
 
The rate at which the actual air temperature changes with increasing height above the surface is referred to as the ____ rate. 
environmental lapse 
 
 
Absolute instability results when the environmental lapse rate is ____ the ____ adiabatic rate. 
greater than; dry 
 
 
An air parcel in an unstable atmosphere has ____ force acting ...
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WX 201 Exam 2 with correct Answers (Graded A) 
____ is a condition in which the environmental lapse rate is equal to the dry adiabatic rate. 
Neutral stability 
 
 
The rate at which the actual air temperature changes with increasing height above the surface is referred to as the ____ rate. 
environmental lapse 
 
 
Absolute instability results when the environmental lapse rate is ____ the ____ adiabatic rate. 
greater than; dry 
 
 
An air parcel in an unstable atmosphere has ____ force acting ...
WX 201 Exam 1 Study Guide|Complete And Graded A+ 
Variable gasses in the atmosphere 
CO2 , Water Vapor , O3 (ozone) , CH4(methane) 
 
 
Permanent gasses in the atmosphere 
Oxygen (O2) , Nitrogen (N2) , Nobel Gasses 
 
 
Characteristics of a variable gas 
Concentration is changing ; sources and sinks are not consistent 
 
 
Characteristics of a permanent gas 
Concentration in atmosphere remains constant ; sources and sinks consistent 
 
 
Examples of green house gasses 
CH4 , CO2 , CFCs , O3 
 
...
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WX 201 Exam 1 Study Guide|Complete And Graded A+ 
Variable gasses in the atmosphere 
CO2 , Water Vapor , O3 (ozone) , CH4(methane) 
 
 
Permanent gasses in the atmosphere 
Oxygen (O2) , Nitrogen (N2) , Nobel Gasses 
 
 
Characteristics of a variable gas 
Concentration is changing ; sources and sinks are not consistent 
 
 
Characteristics of a permanent gas 
Concentration in atmosphere remains constant ; sources and sinks consistent 
 
 
Examples of green house gasses 
CH4 , CO2 , CFCs , O3 
 
...
WX 201 Exam 1 |Complete And Graded A+ 
Atmosphere 
Collection of gaseous molecules, small liquid and solid particles 
 
 
Latitude 
The angular distance along the meridian from the point in question to the equator 
 
 
Tropic of Capricorn 
23.5 degrees south 
 
 
Tropic of Cancer 
23.5 degrees North 
 
 
Weather 
atmospheric conditions at any particular place or time 
 
 
Climate 
Accumulation of weather weekly, monthly, seasonally. "accumulation of weather" 
 
 
Density 
Mass of anything 
 
...
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WX 201 Exam 1 |Complete And Graded A+ 
Atmosphere 
Collection of gaseous molecules, small liquid and solid particles 
 
 
Latitude 
The angular distance along the meridian from the point in question to the equator 
 
 
Tropic of Capricorn 
23.5 degrees south 
 
 
Tropic of Cancer 
23.5 degrees North 
 
 
Weather 
atmospheric conditions at any particular place or time 
 
 
Climate 
Accumulation of weather weekly, monthly, seasonally. "accumulation of weather" 
 
 
Density 
Mass of anything 
 
...
WX 201 Exam 1 |Complete And Graded A+ 
Humidity is 
a measure of the amount of water vapor in the air 
 
 
Which of the following is considered a variable gas in Earth's atmosphere? 
water vapor 
 
 
Water vapor molecules 
are invisible 
 
 
The atmospheric concentration of CO2 has risen by about ____ since 1958, when measurements began at Mauna Loa Observatory in Hawaii. 
about 30% 
 
 
Most human-made impurities found in the atmosphere present a health and environmental hazard. These are cal...
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WX 201 Exam 1 |Complete And Graded A+ 
Humidity is 
a measure of the amount of water vapor in the air 
 
 
Which of the following is considered a variable gas in Earth's atmosphere? 
water vapor 
 
 
Water vapor molecules 
are invisible 
 
 
The atmospheric concentration of CO2 has risen by about ____ since 1958, when measurements began at Mauna Loa Observatory in Hawaii. 
about 30% 
 
 
Most human-made impurities found in the atmosphere present a health and environmental hazard. These are cal...
WX 201 Exam 1 |Complete And Graded A+ 
Meteorology is the study of: 
The Atmosphere 
 
 
Weather describes the conditions averaged over a region or over a period, whereas climate describes the condition of the atmosphere at a particular time and place. 
False 
 
 
In ____ near Earth's surface today, nitrogen occupies 78 percent and oxygen nearly 21 percent. 
The volume of air 
 
 
Atmospheric concentration of helium has increased from below 300 ppm historically to over 400 ppm presently. 
Fals...
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WX 201 Exam 1 |Complete And Graded A+ 
Meteorology is the study of: 
The Atmosphere 
 
 
Weather describes the conditions averaged over a region or over a period, whereas climate describes the condition of the atmosphere at a particular time and place. 
False 
 
 
In ____ near Earth's surface today, nitrogen occupies 78 percent and oxygen nearly 21 percent. 
The volume of air 
 
 
Atmospheric concentration of helium has increased from below 300 ppm historically to over 400 ppm presently. 
Fals...