Discussion
Which criterion identifies symmetric instability?
Answer: B
Where the surfaces of constant absolute momentum are less steep than the surfaces of constant equivalent potential temperature, a slantwise displacement releases energy and instability follows. Equivalently the moist potential vorticity becomes negative. Recognising the criterion on a cross section is how forecasters anticipate banded frontal snowfall. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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