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Re: Is this LI calculation correct?

Posted By: Bill Moninger
Date: 2-July-07 2049Z

In Response To: Is this LI calculation correct? (Scott Dennstaedt)

Scott,

There are a number of thermodynamic indices shown on the RUC soundings plot, and the documentation wasn't very clear on the detailed differences between them. I've clarified the documentation, at http://rucsoundings.noaa.gov/help.html, as follows:

The following thermodynamic indices are also shown, if available:

* These values are taken directly from RUC model output, if available (for further details about these, please see http://ruc.noaa.gov/vartxt.html):

o CAPE (Convective Available Potential Energy) in J/Kg

o CIn (Convective inhibition) in J/Kg

o PW (Precipitable water) in Kg/m^2

o Helic (storm-relative helicity) in m^2/s^2 (not currently available)

* These values are calculated directly from the sounding data by the display software:

o TT (Total Totals index)

o KI (K index)

o SI (Showalter index)

o LI (Lifted index) of the mixed layer (assumed to be the lowest 100 mb of the sounding)

o LCL (Lifted Condensation Level) of the mixed layer (assumed to be the lowest 100 mb of the sounding)

* These values are calculated when the user specifies a parcel:

o iCAPE (interactive CAPE) - approximate CAPE of the parcel

o iCIn (interactive CIn) - approximate CIn of the parcel

o iLCL (interactive Lifted Condensation Level) of the parcel

Thanks for asking. We welcome other questions to clarify this information further.

-Bill

Messages In This Thread

Is this LI calculation correct? -- Scott Dennstaedt -- 13-June-07 2026Z
Re: Is this LI calculation correct? -- Bill Moninger -- 2-July-07 2049Z

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