Discussion
Which quantity does an upper air chart contour?
Answer: B
An upper air chart is drawn for a constant pressure surface and contours its geopotential height, so the contours function exactly as isobars do on a surface chart. Temperature is usually overlaid as dashed isotherms. Pressure cannot be contoured on a surface where it is by construction constant, and thickness requires two surfaces rather than one. Reading a constant pressure chart exactly as one reads a surface isobaric chart is the habit that makes upper air analysis straightforward.
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