Discussion
Match each hemisphere and turning with the advection implied.
List I
A. Northern, veering
B. Northern, backing
C. Southern, veering
List II
P. cold advection
Q. warm advection
R. cold advection in the south
Select the correct match.
Answer: B
In the northern hemisphere veering means warm advection and backing means cold advection, while in the southern hemisphere the sense reverses so that veering means cold advection. The reversal follows from the sign of the Coriolis parameter, which puts warm rather than cold air on the left of the thermal wind south of the equator. Stating the rule with its hemisphere attached avoids the commonest error.
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