altimeter setting indicator—A precision aneroid barometer calibrated to indicate directly the altimeter setting.
altitude—Height expressed in units of distance above a reference plane, usually above mean sea level or above ground.
Altimeter setting- That pressure value to which an aircraft altimeter scale is set so that it will indicate the altitude above mean sea-level of an aircraft on the ground at the location for which the value was determined.
Altimeter Setting
A correction of the station pressure to sea level used by aviation. This correction takes into account the standard variation of pressure with height and the influence of temperature variation with height on the pressure.
The altimeter setting in aviation, set either QNH or QFE, is another atmospheric pressure reduced to sea level, but the method of making this reduction differs slightly. See altimeter.
Altimeter setting The value of atmospheric pressure to which the scale of a pressure altimeter is set so as to indicate airport elevation. The altimeter setting is included as part of an aviation weather observation.
It is read accurately only in a standard atmosphere and when the correct altimeter setting is used.Pressure AltitudeThe altitude in standard atmosphere at which a given pressure will be observed.
Altimeter Setting:The value set in an aircraft so that it will indicate the height above sea level at that location.
Altitude: The height above the ground.
Alto: Meaning high.
AM: Ante Merdiem: Before Noon
Anders Celsius: Born Nov. 27, 1701.
PRESSURE ALTIMETER
An aneroid barometer calibrated to indicate altitude in feet instead of units of pressure. It is read accurately only in a standard atmosphere and when the correct altimeter setting is used.
It may include type of report, station identifier, date and time of report, a report modifier, wind, visibility, runway visual range, weather and obstructions to vision, sky condition, temperature and dew point, altimeter setting and remarks.
Tailored to the needs of aviation, these reports describe current conditions such as air temperature, dew point, humidity, wind direction, wind speed, altimeter setting, visibility, and cloud ceiling.
letter code used by aircraft in requests for information; it is also used in the supply of information to aircraft. Certain items in the code relate to meteorological information, for example, QFE refers to station pressure, QNH to altimeter setting.
used in the United States to satisfy requirements for reporting surface meteorological data. Minimum reporting requirements includes wind, visibility, runway visual range, present weather, sky condition, temperature, dew point, and altimeter setting.
Quasi-nonhydrostatic (QNH) Pilots, air traffic control (ATC) and low frequency weather beacons use this pressure setting to refer to the barometric altimeter setting that causes the altimeter to read altitude above mean sea level within a certain ...
 See also: Altimeter, Meteor, Pressure, Weather, Earth
  
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