Angel Oppong - Lab 8 Skew-T diagram and Atmospheric stability
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Eastern Michigan University *
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Jan 9, 2024
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ESSC 101 Lab 8: Skew-T Diagrams and Atmospheric stability Report
1. After reading the Lab procedures, formulate a question that will be answered after completing your lab. 2. Describe the methodology you will use to complete your laboratory exercise. (Remember that would include, an explanation of how you obtained the data, and how the materials will be used to complete your lab.) 3. Record Data:
Part 1 Reading a Skew-T diagram Questions
Examine the Skew-T diagram (Figure 1 ) in the procedures and answer the following questions.
1.
What is the data that is plotted on a Skew-T diagram?
2.
What is the surface temperature for FFC on 3/11/22 00Z? (Hint: It is printed at the surface pressure isobar)
The surface temperature is 63 F (about 17 C).
3.
What is the surface dewpoint temperature for FFC on 3/11/22 00Z? The surface dewpoint temperature is 52 F (about 11 C).
4.
Examine the Skew-T diagram. Find the temperature lines (for 0 and -20 C, marked in blue) in the Skew -T diagram in Figure 1. At what pressure in the atmosphere does the temperature go below freezing (0C)? The pressure at which the temperature goes below freezing is about at 675mb.
5.
Examine the relationship of the temperature and dew point temperature on the the Skew-
T diagram between what heights (pressure) would you most likely expect to see clouds develop? (Remember that Clouds need saturated conditions, requiring similar
temperature and dewpoints)
We will most likely see clouds between about 820mb and about 990mb.
6.
Find the wind data on the right hand side of the diagram. Do the wind directions vary with decreasing pressure (higher altitudes)? The wind direction mostly stays the same from 100mb to 850mb (west winds). After 850mb, the wind direction changes southwest.
7.
At what pressure, do you find the highest wind speeds? The highest wind speeds can be found between 100mb to 200mb.
8.
Find the dashed line representing the calculated adiabatic temperature. What is the color of this line? And is it to the left or right of the environmental temperature? The color of the line representing the calculated (theoretical) adiabatic temperature is dark red / maroon. This line is mostly printed to the left of the environmental temperature.
Part 2 Analysis Skew-T diagram for atmospheric Stability
Attach your western Skew-T diagram here:
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Attach your Florida Skew-T diagram here:
Using your attached Skew-T diagrams complete this table. (Remember units where necessary)
Station Code Name (upper left Corner)
LKN
TBW
Location (State)
Nevada
Florida
Surface temperature
62 F (about 16 C)
72 F (about 22 C)
Surface Dewpoint 30 F (about -1 C)
50 F (10 C)
Wind speed variations
Varies between about 15kt (starting at surface) to 115kt.
Varies between about 10 kt (starting from 1000mb) to 110 kt. Wind direction variations
Varies between southwest and
west
Varies between west and northeast
Height Clouds would form
Between 180mb and 450mb, and between 600mb and 700mb
Between about 880mb and 1000mb
Atmospheric Stability (stable,
unstable, conditional)
Conditional (mostly stable)
Stable
4.
Laboratory Analysis:
The lab analysis discussion should include your observations from each atmospheric sounding, an
explanation of the atmospheric stability, and a comparison of the differences and similarities between the two atmospheric soundings. (Hint: remember to use your Data as the evidence in your discussion.)
After looking at both Nevada’s and Florida’s skew-t diagram, some of the data recorded were similar. For example, the atmospheric stability where mostly stable in both diagrams. Also, the lowest and high wind speed differs by about 5 kt. The surface temperature in Florida is 10 F higher than Nevada (Florida: 72 F, Nevada: 62 F), while the Dewpoint in Florida is 20 F higher than Nevada (Florida 50 F, Nevada: 30 F). In Nevada, according to the surface temperature and dewpoint, clouds may form at different pressure heights (180-450mb and 600mb-700mb), while Florida may form clouds at 800mb-1000mb. I also noticed that the surface pressure height are located differently (Florida: about 1005mb, Nevada: 840mb). 5. Final Lab Conclusion:
After completing your analysis, write a conclusion to your Lab report. Your conclusion should address how well your lab experiments addressed the question posed at the beginning of the Lab report and a address of what you have learned about Skew-T diagrams.