Discussion
Which rule places the thermal wind relative to the thickness contours?
Answer: B
The thermal wind obeys the same geometry as the geostrophic wind, with thickness playing the role of height, so it blows along the thickness contours with low values on the left in the northern hemisphere. Since low thickness means cold air, this is the familiar statement that the thermal wind blows with cold air on its left. The rule reverses in the southern hemisphere along with the sign of the Coriolis parameter, which is worth checking explicitly. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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