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Which imagery is used to track that feature operationally?

  • A.Visible channel imagery, on which the feature appears as a distinct bright region against the darker sea
  • B.Radar reflectivity
  • C.Infrared imagery, which shows the temperature of the cloud tops rather than the humidity of the air
  • D.Water vapour channel satellite imagery

Answer: D

The water vapour channel responds to upper tropospheric humidity, so descending dry stratospheric air associated with a potential vorticity anomaly appears as a dark region even where there is no cloud. This makes it uniquely suited to tracking upper level features. Visible, infrared and radar imagery all require cloud or precipitation to show anything at all.

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