Discussion
Which imagery displays that feature most directly?
Answer: B
The water vapour channel responds to upper tropospheric humidity, so descending dry stratospheric air appears as a dark feature that corresponds closely to the potential vorticity anomaly. Overlaying model potential vorticity on the imagery is a routine verification. Visible and infrared channels see cloud rather than humidity and reveal nothing where there is no cloud. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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