The Lifted Index as a Predictor of Latent Instability

Galway, Joseph G.

doi:10.1175/1520-0477-37.10.528

Cited by 326 publications

(163 citation statements)

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“…Lifted Index (LI): LI (Galway, 1956) is a measure of the thunderstorm potential, which takes into account of the low-level moisture availability, and a negative index indicates the possibility of convection. It is the subtraction of the temperature of the parcel at 500 hPa from the environmental temperature at 500 hPa like the following:…”

Section: Selected Stability Indicesmentioning

confidence: 99%

Trends of Stability Indices and Environmental Parameters Derived from the Rawinsonde Data over South Korea

Eom¹,

Suh²

2011

Journal of the Korean earth science society

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In this paper, trends of the widely used stability indices (SIs) and environmental parameters (EPs) were examined by using the 30-year routine rawinsonde data observed in three upper air observatories (Osan, Gwangju and Pohang) over South Korea. To take into account of the contribution of water vapor to a parcel density, we applied the virtual temperature correction in calculating the SIs and EPs. The trends of SIs and EPs indicated significant increases of temperature and moisture contents, especially at the low-to-mid troposphere during the last 10 years. The warming trend in the lower troposphere shows about 3 times greater than that of the global average (+0.10-+0.20 o C/10 years), whereas the cooling trend of lower stratosphere demonstrates a similar trend with the global average (−0.33-−0.60 o C/10 years). The vertical stability is clearly reduced due to the unsymmetrical change of atmospheric elements. The unstabilizing trend with the increased moisture contents gradually changed the atmospheric environment in South Korea into the conditions favorable for the occurrence of severe weather or intensifications of such events. These trends are consistent with the recent observations, which showed clear increase in the intensity and frequency of heavy rainfalls.

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Section: Selected Stability Indicesmentioning

confidence: 99%

Trends of Stability Indices and Environmental Parameters Derived from the Rawinsonde Data over South Korea

Eom¹,

Suh²

2011

Journal of the Korean earth science society

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“…The lifted (LI) index (Galway, 1956) is obtained by first raising air parcels from the surface dry adiabatically to the lifting condensation level and then moist adiabatically to 500 mb. The index is given by the temperature difference between the parcel and the environmental air at 500 mb.…”

Section: A Computed Quantitiesmentioning

confidence: 99%

Synoptic aspects and physical processes in the rapidly intensifying cyclone of 6–8 March 1986

Yau

Jean

1989

Atmosphere-Ocean

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“…Additionally, there were some erroneous measurements near the ground. Nevertheless, one can see the over-adiabatic ground layer with easterly winds and the southerly flow in higher levels and the latent instability (Galway 1956;Groenemeijer 2005). CAPE, calculated from a parcel from the lowest 500 m of the atmosphere, raised dry adiabatically to the LCL and moist adiabatically thereafter, is about 1,200 J kg -1 compared to a CAPE of approximately 1,500 J kg -1 calculated from the model data.…”

Section: Pre-storm Conditionsmentioning

confidence: 81%

Nowcasting of a supercell storm with VERA

Schneider

Chimani

Kaufmann

et al. 2008

Meteorol Atmos Phys

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On 13th May 2003, a severe weather event took place in Vienna, located in the eastern part of Austria at the foothills of the Alps. A supercell storm was reported by storm chasers, including a tornado, large hail and flash floods due to heavy precipitation, causing damage to both people and to goods in parts of Vienna downtown, which is a rather rare event in this region. For this reason, the development of the thunderstorm has been analysed from the synoptic scale down to the storm scale using different data sources, including, e.g. ground measurements, radio soundings and remote sensing data, for a better understanding of the onset and evolution of such a severe weather event. Furthermore, VERA (Vienna Enhanced Resolution Analysis), a real-time analysis system for surface data, was tested on this case study. Measurements which were available during the event have been used to reanalyse the pre-storm situation, testing the possibility of nowcasting such a storm.

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The Lifted Index as a Predictor of Latent Instability

Cited by 326 publications

References 1 publication

Trends of Stability Indices and Environmental Parameters Derived from the Rawinsonde Data over South Korea

Trends of Stability Indices and Environmental Parameters Derived from the Rawinsonde Data over South Korea

Synoptic aspects and physical processes in the rapidly intensifying cyclone of 6–8 March 1986

Nowcasting of a supercell storm with VERA

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