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  2. Contour line - Wikipedia

    en.wikipedia.org/wiki/Contour_line

    An isobar (from Ancient Greek βάρος (baros) 'weight') is a line of equal or constant pressure on a graph, plot, or map; an isopleth or contour line of pressure. More accurately, isobars are lines drawn on a map joining places of equal average atmospheric pressure reduced to sea level for a specified period of time.

  3. History of surface weather analysis - Wikipedia

    en.wikipedia.org/wiki/History_of_surface_weather...

    Within a short time, the Signal Corps added a tables showing eight-hour pressure change, 24-hour temperature change, relative humidity, and 24-hour precipitation. The Signal Office also added a general discussion of synoptic weather features and forecast, before adding isobars and isotherms onto the maps.

  4. Surface weather analysis - Wikipedia

    en.wikipedia.org/wiki/Surface_weather_analysis

    Once a map has a field of station models plotted, the analyzing isobars (lines of equal pressure), isallobars (lines of equal pressure change), isotherms (lines of equal temperature), and isotachs (lines of equal wind speed) are drawn. [18] The abstract weather symbols were devised to take up the least room possible on weather maps. [citation ...

  5. Skew-T log-P diagram - Wikipedia

    en.wikipedia.org/wiki/Skew-T_log-P_diagram

    In 1947, N. Herlofson proposed a modification to the emagram that allows straight, horizontal isobars and provides for a large angle between isotherms and dry adiabats, similar to that in the tephigram. This made the diagram useful for analysis techniques that were then being adopted by the United States Air Force.

  6. Thermodynamic diagrams - Wikipedia

    en.wikipedia.org/wiki/Thermodynamic_diagrams

    Thermodynamic diagrams usually show a net of five different lines: isobars = lines of constant pressure; isotherms = lines of constant temperature; dry adiabats = lines of constant potential temperature representing the temperature of a rising parcel of dry air

  7. Baroclinity - Wikipedia

    en.wikipedia.org/wiki/Baroclinity

    Visualization of a (fictive) formation of isotherms (red-orange) and isobars (blue) in a baroclinic atmospheric layering. A rotating tank experiment modelling baroclinic eddies in the atmosphere In fluid dynamics , the baroclinity (often called baroclinicity ) of a stratified fluid is a measure of how misaligned the gradient of pressure is from ...

  8. Emagram - Wikipedia

    en.wikipedia.org/wiki/Emagram

    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 ...

  9. Isotherm - Wikipedia

    en.wikipedia.org/wiki/Isotherm

    Isotherm may refer to: . Isotherm (contour line) – a type of equal temperature at a given date or time on a geographic map Isotherm – in thermodynamics, a curve on a P-V diagram for an isothermal process