American Meteorological Society Certification Thermodynamics and Atmospheric Stability 2

Question 1

What does the CIN (Convective Inhibition) represent on a sounding?

Accepted Answer

Energy that must be overcome by lifting to reach the LFC

Answer

CIN represents the negative buoyancy energy that must be overcome before a parcel can reach the LFC and convect freely.

Question 2

The moist adiabatic lapse rate (MALR) is approximately what value near the surface?

Accepted Answer

4–7°C/km

Answer

The MALR varies from about 4°C/km in warm moist air to 7°C/km in cooler air, less than the DALR due to latent heat release.

Question 3

What is potential temperature (theta) and why is it useful?

Accepted Answer

Temperature a parcel would have if brought adiabatically to 1000 hPa; conserved in dry adiabatic motion

Answer

Potential temperature is conserved during dry adiabatic processes, making it ideal for identifying airmass properties and stability.

Question 4

What type of lapse rate produces absolutely unstable conditions?

Accepted Answer

Lapse rate greater than the DALR

Answer

Absolute instability occurs when the environmental lapse rate exceeds the dry adiabatic lapse rate (~9.8°C/km), causing any parcel to accelerate upward.

Question 5

On a Skew-T log-P diagram, the dew point profile indicates what?

Accepted Answer

Moisture content as a function of pressure

Answer

The dew point profile on a Skew-T shows the moisture content of the atmosphere as a function of pressure level.

American Meteorological Society Certification Practice Test

American Meteorological Society Certification Practice Test

American Meteorological Society Certification Thermodynamics and Atmospheric Stability 2