Discussion
Which filtering is applied before a vorticity field is displayed operationally?
Answer: B
Because the Laplacian amplifies short wavelengths, raw vorticity computed from an analysis contains a great deal of small-scale noise that obscures the meteorologically significant maxima. A smoothing pass is therefore standard before display. Absolute vorticity, which retains the planetary part, is what is normally plotted, potential vorticity is a separate product, and anomalies from climatology are used for other purposes such as identifying unusual events rather than for routine synoptic tracking of short wave features.
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