Barometric Tendency The amount and direction of change in barometer readings over a three-hour period.
barometric tendency—The change of barometric pressure within a specified period of time. In aviation weather observations, routinely determined periodically, usually for a 3-hour period.
beam resolution—See resolution.
Pressure tendency (barometric tendency) The character and amount of atmospheric pressure change for a three-hour or other specified period ending at the time of observation.
PRESSURE TENDENCY: (BAROMETRIC TENDENCY) The change in barometric pressure within a specified period of time (typically 3 hours for meteorological observations).
These values can be contoured just like the pressure itself, and the lines ∂p/∂t = constant are called isallobars, lines of constant barometric tendency. Rates of change of pressure contour just like pressure itself, with highs and lows.
 See also: Pressure, Radiation, Weather, Clouds, Barometer
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