WEAX WX 301 Quiz Stability Lab with Plotted
Sounding Actual Questions and Answers 100%
Correct
Quiz Instructions
Use this skew-T to answer questions 1-14.
Question 1 2 pts
Examine the plotted sounding provided. The red line is the environmental temperature, while the
blue line is the environmental dew point temperature.
The lowest pressure level (i.e., the bottom of the sounding) provides the temperature and dew
point at the surface. We will therefore refer to this pressure level as the "surface level" for this
sounding. What was the pressure at the surface at time the sounding was taken?
1013mb
1000 mb
960 mb
910 mb
Question 2 2 pts
What was the surface temperature and dew point temperature (in Celsius)?
T = 22, Td = 18
T = 26, Td = 22
T = 30, Td = 25
,Question 3 4 pts
What is the sounding temperature (in Celsius) at 500 mb?
-15
+13
Question 4 4 pts
What is the 700 mb dew point temperature (in Celsius)?
0
-15
Question 5 4 pts
Next compute the Lifted Condensation Level (LCL). To determine the LCL, start with the
temperature at the surface on the thermodynamic diagram. Draw a line parallelling the dry
adiabats (brown lines) upward to the left (for about an inch). Then draw a second line starting
from the surface dewpoint temperature following the mixing ratio line(dotted green line) upward
to the right until it crosses the dry adiabat line you just drew. This is
the LCL. What is the approximate pressure level (mb) of the LCL?
1000 mb
964 mb
, 910 mb
840 mb
Question 6 4 pts
Why should pilots be concerned with the lifted condensation level (LCL)?
The LCL is typically representative of cloud tops. The
LCL is typically representative of cloud bases. The LCL
indicates thunderstorm probability.
The LCL is only of concern to meteorologists.
Question 7 4 pts
Starting at the LCL, draw the lifted parcel line parallel to the moist (saturated) adiabat until you
come to the top of the chart. Now examine the line you just drew, i.e., the parcel
path. At the 500mb level, what is the temperature of the parcel?
-15oC
-7oC
+7oC
22oC
Question 8 4 pts
The Lifted Index (LI) is computed from the difference between the environmental temperature (Te) at
500 mb and the parcel temperature (Tp) at 500mb. That is, LI = Te - Tp.The environmental temperature
refers to the red line, while the parcel temperature
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