The change in barometric pressure within a specified period of time (typically 3 hours for meteorological observations).
The nature of the change in atmospheric pressure over the past several hours. It can be a useful aid in short-range weather prediction.
The pressure characteristic and amount of pressure change during a specified time period, usually the three hour period preceding the observation.
(Also called barometric tendency.) The character and amount of atmospheric pressure change during a specified period of time, often a three-hour period preceding an observation. Pressure tendency is composed of two parts, the pressure change and the pressure characteristic. The pressure change is the net difference between pressure readings at the beginning and ending of a specified interval of time. The pressure characteristic is an indication of how the pressure has been changing during that specified period of time, for example, decreasing then increasing, or increasing and then increasing more rapidly. See tendency.
the character and amount of atmospheric pressure change for a three-hour or other specified period ending at the time of observation.
