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Which lines run diagonally on a skew-T diagram?

  • A.The isobars, which are drawn at an angle so that the plotted sounding runs approximately vertically up the page
  • B.The mixing ratio lines only
  • C.The dry adiabats, which are skewed relative to the vertical so that the saturated adiabats become straight
  • D.The isotherms

Answer: D

On a skew-T log-p diagram the isotherms are skewed to run at about forty five degrees while the isobars remain straight and horizontal with a logarithmic spacing. Skewing the isotherms spreads a typical sounding across the diagram rather than compressing it into a narrow band, which is the whole purpose of the design. The dry adiabats curve gently to the left and the saturated adiabats curve more strongly, converging towards the dry adiabats at low temperature.

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