Discussion
Which side does cold air lie on for a northern hemisphere thermal wind?
Answer: D
Because low thickness corresponds to cold air and the thermal wind blows with low thickness on its left, cold air lies to the left in the northern hemisphere. The rule reverses in the southern hemisphere along with the sign of the Coriolis parameter. It is a direct transcription of Buys Ballot's law with thickness substituted for pressure, so anyone who has the geostrophic rule firmly in hand gets the thermal one free. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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