Discussion
A sounding shows the wind veering steadily from south-westerly at the surface to westerly at 500 hectopascals.
What does this indicate about temperature advection?
Answer: C
Veering with height in the northern hemisphere places the thermal wind to the right of the lower level wind, and since the thermal wind blows with cold air on its left, warm air must be being advected into the layer. This is one of the most useful inferences obtainable from a single sounding and follows entirely from the thermal wind relation. No absolute temperatures are needed, only the turning.
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