Discussion
Assertion (A): A veering wind with height in the northern hemisphere indicates warm advection.
Reason (R): The thermal wind blows with cold air on its left in the northern hemisphere.
Select the correct answer from the options below.
Answer: B
Veering places the thermal wind to the right of the lower level wind, and if the thermal wind has cold air on its left then the flow at that level must be coming from the warm side. The reason therefore explains the assertion exactly. The same argument run with backing gives cold advection, and both rules reverse in the southern hemisphere along with the sign of the Coriolis parameter.
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