The Skew-T is one of the four thermodynamic diagrams used to analyze the thermal structure of the atmosphere. The name comes the skewed aspect (English skewed) from the axis of the Température S ( T ). It is used to point the temperature and the Dewpoint coming from a survey Aérologique by radiosondes, from a plane or extrapolated by satellite.
In 1947, NR. Herloffson proposes a modification of the émagramme which allows straight lines and horizontal for the isobar layout of the S as well as a great angle between the Isotherme S and the Adiabatique S dry. The whole similar to the Téphigramme but the potential temperatures and the dry adiabatics are curved there instead of right-hand sides. In general, the lines of Rapport of mixture are also indicated and the winds with the various pressure levels are often added in the margin in the form of barbules.
This new diagram corresponded to the needs for the American air force (United States Air Force) for new types of analyzes of the atmosphere. Like the téphigramme, Skew-T makes it possible to calculate energy between two temperature curves more easily than on the émagramme.
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