- absolute instability
- As it relates to meteorology, the state of a layer of air within the atmosphere in which a parcel of air, if given an upward push, will move away from its initial level without further outside force being applied. It is that condition in which the observed lapse rate is more than the dry and saturated adiabatic lapse rates. A mass of dry air in this case will rise until it becomes saturated and will still continue to rise, as the observed lapse rate is still greater. See also dry adiabatic lapse rate and saturated adiabatic lapse rate.Dry adiabatic lapse rate = 3°c per thousand ft.Saturated adiabatic lapse rate = 1.5°c per thousand ft.In this case, environment lapse rate (ELR) > dry air lapse rate (DALR) > saturated air lapse rate (SALR). Hence, a parcel of air will continue to rise if it is given an upward push.
Aviation dictionary. 2014.
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