Discussion
Consider the following pairs of stability condition and criterion.
Absolute stability - environmental rate below saturated rate
Conditional instability - rate between the two adiabats
Absolute instability - rate above the dry adiabatic rate
Potential instability - potential temperature decreasing with height
How many of the pairs given above are correctly matched?
Answer: B
Potential instability requires equivalent potential temperature rather than potential temperature to decrease with height, so the last pairing is wrong. A decrease of ordinary potential temperature would indicate absolute instability. The three parcel criteria plus the layer criterion together cover every stability question the subject asks. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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