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Lifted Index

Meteorology  LEWP  Lifting
04/24/2014

LIFTED INDEX (LI) A measure of atmospheric instability that is obtained by computing the temperature that the air near the ground would have if it were lifted to a higher level and comparing it to the actual temperature at that altitude.


Lifted Index (LI) Lifted Index (LI) Thunderstorm Indication < -5
Very Unstable, Heavy/strong thunderstorm potential
-3 to -5
Unstable, Thunderstorms probable
0 to -2
Marginally Unstable, Thunderstorms possible ...

Lifted Index
(abbrev. LI)- A common measure of atmospheric instability.

Lifted Index (LI): It is a stability index used to determine thunderstorm potential. The LI is calculated by taking a representative low level air parcel and lifting it adiabatically to 500 mb.

LIFTED INDEX- The environmental temperature at 500 millibars minus the 500 millibar parcel temperature on a Skew-T diagram. Negative LI values are unstable. ...

The Lifted Index is a measure of atmosphere's stability (or instability) and Meteorologists use it to determine the thunderstorm potential.

LIFTED INDEX - A measurement of the instability of the atmosphere based on the temperature difference between a parcel of air from the surface and the ambient air at 500 Mb pressure altitude (18,500 feet).

Related Term : Lifted Index
2. National Oceanographic and Atmospheric Administration (NOAA ) ...

LFTLiftLGTLightLGWVLong WaveLILifted Index. A common measure of atmospheric instability.

MLLIMean Layer Lifted Index - Lifted Index (LI) calculated using a parcel consisting of Mean Layer values of temperature and moisture from the lowest 100 mb above ground level. See Lifted Index (LI).MLLW(Mean Lower Low Water) - A tidal datum.

In cases of elevated convection, stability indices based on near-surface measurements (such as the lifted index) typically will underestimate the amount of instability present.

LI - Abbreviation for lifted index.
lid - (Also known as cap, capping inversion, capping layer.) A thin layer with enhanced static stability separating a layer below possessing large convective available potential energy from a layer above ...

of a measure to a standard or true value; in other words, how close a predicted or measured value is to the true value.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: bias, Delta T, Li, Lifted Index, MLLI, ...

from their original position; especially, the tendency to accelerate upward after being lifted. Instability is a prerequisite for severe weather - the greater the instability, the greater the potential for severe thunderstorms. See lifted index and ...

See also: See also: Thunder, Air, Weather, Thunderstorm, Thunderstorms

Meteorology  LEWP  Lifting
04/24/2014

 
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