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Skew T Diagram Essentials
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1
Question
On a Skew-T Log-P diagram, the warmest air is located in which corner of the diagram?
Page 2
Answer
Bottom right
2
Question
How many different sets of isopleths are there on a standard Skew-T Log-P diagram?
Page 2
Answer
5
3
Question
On a Skew-T Log-P diagram, to track changes in a vertically moving unsaturated parcel, follow a what adiabat?
Page 2
Answer
Dry adiabat
4
Question
On a Skew-T Log-P diagram, to track changes in a vertically moving saturated parcel, follow a what adiabat?
Page 2
Answer
Moist adiabat
5
Question
If the saturation mixing ratio at 700 mb is 8 g/kg and the relative humidity is 25%, what is the actual mixing ratio of the parcel?
Page 2
Answer
2 g/kg
6
Question
What is the definition of potential temperature for an air parcel?
Page 3
Answer
The temperature the parcel would have if moved dry adiabatically to the 1000 mb level.
7
Question
A parcel at 500 mb has a temperature of -20°C. When moved dry adiabatically to 1000 mb, its temperature becomes 35°C. What is this value called?
Page 3
Answer
Potential temperature
8
Question
On a Skew-T Log-P diagram, if the temperature sounding in a layer lies between the dry adiabat and moist adiabat both passing through the bottom temperature of the layer, what is the stability of that layer?
Page 3
Answer
Conditionally unstable
9
Question
With only a temperature sounding (no dew point) on a Skew-T Log-P diagram, can you determine the relative humidity at any level?
Page 3
Answer
No
10
Question
With only a temperature sounding (no dew point) on a Skew-T Log-P diagram, can you determine the saturation mixing ratio at any level?
Page 3
Answer
No
11
Question
With only a temperature sounding on a Skew-T Log-P diagram, can you determine the potential temperature at any level?
Page 3
Answer
Yes
12
Question
With only a temperature sounding on a Skew-T Log-P diagram, can you assess the stability of various layers?
Page 3
Answer
Yes
13
Question
The notion of wind chill is based on wind increasing what from the skin?
Page 4
Answer
Evaporation
14
Question
A necessary ingredient for lake-effect snow formation is a large what in the lowest atmospheric layer over the lake?
Page 4
Answer
Environmental lapse rate
15
Question
Why is the moist adiabatic lapse rate less than the dry adiabatic lapse rate?
Page 1
Answer
Condensation in a saturated parcel releases latent heat, slowing the cooling rate.
16
Question
What is the standard dry adiabatic lapse rate?
Page 1
Answer
10°C/km
17
Question
What is the average moist adiabatic lapse rate?
Page 1
Answer
6°C/km
18
Question
In the Northern Hemisphere at high altitudes, where the temperature gradient reverses to warmer southward, what boundary have you reached?
Page 1
Answer
Tropopause
19
Question
For surface low-pressure systems to persist, what must occur aloft to compensate for low-level convergence?
Page 1
Answer
Upper-air divergence
20
Question
For surface high-pressure systems to persist, what must occur aloft to compensate for low-level divergence?
Page 1
Answer
Upper-air convergence
21
Question
The moist adiabatic lapse rate is less than the dry because of release of what during condensation?
Page 1
Answer
Latent heat
22
Question
What defines a conditionally unstable layer on a Skew-T diagram?
Page 3
Answer
Temperature sounding between dry and moist adiabats from the layer's bottom.
23
Question
What process does wind enhance to cause wind chill?
Page 4
Answer
Evaporation of perspiration from the skin
24
Question
The tropopause is characterized by what temperature change with latitude in the NH?
Page 1
Answer
Warmer to the south, colder to the north