An evaluation of NGM lifted index predictions of extreme instability

Weiss, Steven J.

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An evaluation of NGM lifted index predictions of extreme instability

1986
By Weiss, Steven J.
Series: Central Region Technical attachment ; 86-25

[PDF-3.05 MB]

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Personal Author:

Weiss, Steven J.
Corporate Authors:

United States. National Weather Service. Central Region
NOAA Program & Office:

NWS (National Weather Service) ; CR (Central Region)

NWS (National Weather Service) ; CR (Central Region) Less -
Description:

The NGM lifted index is computed by lifting parcels from each of the bottom four model layers dry adiabatically to saturation, then moist adiabatically to 500 i±>. The difference between the parcel temperature and the predicted 500 mb temperature is calculated, with a negative value indicating instability. The most unstable value is retained; hence, the term "Four-layer Lifted Index" (4LI). Parcels in the fourth layer are just below 850 mb when the surface pressure is 1013 mb. Note that the 4LI can reflect instability originating in warm air overlying a shallow cold layer, such as in warm frontal overrunning.
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Numerical weather forecasting
Series:

Central Region Technical attachment ; 86-25
Document Type:

Technical Attachment
Rights Information:

Public domain
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Library
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urn:sha256:c112bca85371c18adc9ee387d2fddc523b30b6f8c9a3ccf8da7fedb631471029
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https://repository.library.noaa.gov/view/noaa/33750/noaa_33750_DS1.pdf
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An evaluation of NGM lifted index predictions of extreme instability

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