Interpret water vapour imagery

How do one interpret water vapour imagery?

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Water vapour in the mid & upper troposphere absorbs infrared energy at discrete wavelengths. By using this information, water vapour can behave like a tracer of atmospheric circulation in the mid & upper troposphere. Generally dark regions on water vapour pictures are areas where the air is sinking & drying. Light colour regions are areas of going up motion and moisture. Water vapour images are useful in locating jet streams & short-wave troughs and ridges in the mid & upper troposphere, however are lousy while trying to see clouds near the ground such like stratus.

 

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