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  2. Air mass - Wikipedia

    en.wikipedia.org/wiki/Air_mass

    Maritime tropical air masses are sometimes referred to as trade air masses. Maritime tropical air masses that affect the United States originate in the Caribbean Sea, southern Gulf of Mexico, and tropical Atlantic east of Florida through the Bahamas. [6] Monsoon air masses are moist and unstable. Superior air masses are dry, and rarely reach ...

  3. Surface weather analysis - Wikipedia

    en.wikipedia.org/wiki/Surface_weather_analysis

    A surface weather analysis for the United States on October 21, 2006. By that time, Tropical Storm Paul was active (Paul later became a hurricane). Surface weather analysis is a special type of weather map that provides a view of weather elements over a geographical area at a specified time based on information from ground-based weather stations.

  4. Weather map - Wikipedia

    en.wikipedia.org/wiki/Weather_map

    Such maps have been in use since the mid-19th century and are used for research and weather forecasting purposes. Maps using isotherms show temperature gradients, [2] which can help locate weather fronts. Isotach maps, analyzing lines of equal wind speed, [3] on a constant pressure surface of 300 or 250 hPa show where the jet stream is located.

  5. History of surface weather analysis - Wikipedia

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

    Despite the introduction of the Norwegian cyclone model just after World War I, the United States did not formally analyze fronts on surface analyses until August 1, 1941, just before the WBAN Analysis Center opened in downtown Washington, D.C. [19] [20] [21] The effort to automate map plotting began in the United States in 1969, [22] with the ...

  6. Dry line - Wikipedia

    en.wikipedia.org/wiki/Dry_line

    A dry line (also called a dew point line, or Marfa front, after Marfa, Texas) [1] is a line across a continent that separates moist air and dry air. One of the most prominent examples of such a separation occurs in central North America , especially Texas, Oklahoma, and Kansas, where the moist air from the Gulf of Mexico meets dry air from the ...

  7. Stationary front - Wikipedia

    en.wikipedia.org/wiki/Stationary_front

    Stationary front symbol: solid line of alternating blue spikes pointing to the warmer air mass and red domes pointing to the colder air mass. A stationary front (or quasi-stationary front) is a weather front or transition zone between two air masses when each air mass is advancing into the other at speeds less than 5 knots (about 6 miles per hour or about 9 kilometers per hour) at the ground ...

  8. Reference atmospheric model - Wikipedia

    en.wikipedia.org/wiki/Reference_atmospheric_model

    For example, the U.S. Standard Atmosphere derives the values for air temperature, pressure, and mass density, as a function of altitude above sea level. Other static atmospheric models may have other outputs, or depend on inputs besides altitude.

  9. Atmospheric instability - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_instability

    It is a form of fluid instability found in thermally stratified atmospheres in which a colder fluid overlies a warmer one. When an air mass is unstable, the element of the air mass that is displaced upwards is accelerated by the pressure differential between the displaced air and the ambient air at the (higher) altitude to which it was displaced.

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