English: An emagram is one of four thermodynamic diagrams used to display temperature lapse rate and moisture content profiles in the atmosphere. The emagram has axes of temperature (T) and pressure (p). In the emagram, the dry adiabats make an angle of about 45 degrees with the isobars, isotherms are vertical and isopleths of saturation mixing ratio are almost straight and vertical. Usually, temperature and dew point data from radiosondes are plotted on these diagrams to allow calculations of convective stability or Convective Available Potential Energy. Wind barbs are often plotted at the side of a tephigram to indicate the winds at different heights.
Français : L’émagramme est l'un des quatre diagrammes thermodynamiques utilisés pour analyser la structure thermique de l'atmosphère. Il est utilisé pour pointer la température et le point de rosée provenant d'un sondage aérologique par radiosondes, d'un avion ou extrapolés par satellite. Les axes de l'émagramme sont ceux de température (T) et du logarithme de la pression (P) dans un repère semi-logarithmique. Ces axes sont perpendiculaires dans le diagramme original mais la version la plus courante est celle dont l'axe des températures est à 45 degrés vers la droite, cette dernière est appelée SkewT aux États-Unis et émagramme 761 en France
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