CaneTalk: Lifted Index

Lifted Index

Posted by JAC on 6/13/2009, 8:29 pm

A severe weather parameter.

It is also watched during hurricanes and indicates how unstable the mid and upper atmosphere is.

The more the negative number, the more unstable the air is.

In general, convection intensifies, either in a MCS or TC, when LI is -5 or lower. -10 is very unstable. I have never seen -14 before.

http://en.wikipedia.org/wiki/Lifted_index

http://www.psci.net/~gfritz/index11.html

In this thread:

North TX / OK Severe Weather this afternoon - JAC, 6/13/2009, 9:00 am

Latest MD - JAC, 6/13/2009, 9:10 pm
- Red River still uncapped with 5500 CAPE - JAC, 6/13/2009, 9:14 pm
  - Could bow in a few hours - JAC, 6/13/2009, 9:32 pm
Will is chasing a tornado warned cell east of Amarillo - JAC, 6/13/2009, 8:40 pm
Bill is intercepting a tornado warned cell north of Abilene - JAC, 6/13/2009, 8:36 pm
MCS now building - JAC, 6/13/2009, 5:59 pm
- Get ready for a derecho - JAC, 6/13/2009, 6:04 pm
Very high risk for hail - JAC, 6/13/2009, 4:34 pm
Chasers deployed east of Lubbock, already on a 50k-ft supercell - JAC, 6/13/2009, 4:28 pm
- Cell now 52K ft - JAC, 6/13/2009, 4:40 pm
  - Now 56K-ft, David Drummond is streaming a funnel - JAC, 6/13/2009, 4:57 pm
  - Heading for a 6500 CAPE Bulls-Eye - JAC, 6/13/2009, 4:45 pm
    - I have never seen a -14 LI before - JAC, 6/13/2009, 4:51 pm
      - what is LI ? - CypressTX, 6/13/2009, 8:22 pm
        Lifted Index - JAC, 6/13/2009, 8:29 pm
        thanks for the links - CypressTX, 6/13/2009, 8:38 pm
        this is the video I saw today - CypressTX, 6/13/2009, 8:26 pm
      - What else can I say but 60k-ft - JAC, 6/13/2009, 5:43 pm
Re: North TX / OK Severe Weather this afternoon - Susan, 6/13/2009, 1:44 pm
- You need to think about hunkering down in a few hours - JAC, 6/13/2009, 5:51 pm
- Hope it dodges you again today - JAC, 6/13/2009, 4:09 pm
  - Re: Hope it dodges you again today - Susan, 6/13/2009, 8:21 pm
    - comment and test - Susan, 6/13/2009, 8:39 pm
      - Re: comment and test - JAC, 6/13/2009, 8:45 pm
        Re: comment and test - Susan, 6/13/2009, 8:46 pm
        Not much of an inversion with 5122 CAPE - your lucky - JAC, 6/13/2009, 8:48 pm
Huge Theta-e Feed and max'd LI - JAC, 6/13/2009, 12:02 pm
from Houston Chronicle - CypressTX, 6/13/2009, 10:42 am
from Dallas NWS - CypressTX, 6/13/2009, 10:22 am
- Re: from Dallas NWS - JAC, 6/13/2009, 11:17 am
Dallas & West needs to watch closely - JAC, 6/13/2009, 9:23 am
Insane CAPE & Cap - JAC, 6/13/2009, 9:15 am

< Return to the front page of the: message board | monthly archive this page is in

Post A Reply

This thread has been archived and can no longer receive replies.