Re: Light-Sport Aircraft Yahoo group Lifted index, was: Maxpro Battery monitor

Richard: I had studied that map and had added it to my shortcuts even though I find the presentation a little puzzling. It seems that the numbers on the map describe areas with a particular lifted index and if I remember right the larger the number the less likely there will be unstable air in any given area. But I can't figure out the correlation between the numbers and the color-shaded areas (or what the color-shaded areas intend to represent). (It would be nice if Unisys would add a legend to this page. I've read the info on their web site but I don't find any discussion of this specific upper air map to describe what it intends to show.) Looking at the 12Z 3/29 map for my area (Savannah, GA and Hilton Head SC) the area is deep purple and there is a "2" very near our location. We just had a rain system pass through here. Do the colors designate moisture content in the air mass? or perhaps temperatures at a specific altitude? Thanks.

 

----- Original Message -----

From: Richard Williams

To: Sport_Aircraft@yahoogroups.com

Sent: Sunday, March 28, 2010 7:02 PM

Subject: Light-Sport Aircraft Yahoo group Lifted index, was: Maxpro Battery monitor

 

Bill,

There are several web sites that list the soaring lift index/soaring index/thermal index.
Most seem to be related to a specific area.
Here is a lifted index that covers the U.S.
I'm not sure this will be of any help.
<http://weather.unisys.com/upper_air/ua_con_lift.html>

Mostly, using the Williams...pdf, I compare the current clouds with the pictures to get an indication of the stability/instability of the air.

R. Williams




---------- Original Message -----------
From: "Bill Hobson" <wrhobson@aol.com>
To: <Sport_Aircraft@yahoogroups.com>
Sent: Sun, 28 Mar 2010 17:30:03 -0400
Subject: Re: Light-Sport Aircraft Yahoo group Re: Maxpro Battery monitor

>  
>
>
> I must confess that some of the material (most of the graphs) was a bit over my head. Do you know of a site that depicts the lapse rate on a map? (Or can one go by the Lifted Index?)
>  

> ----- Original Message -----
> From: daleandee
> To: Sport_Aircraft@yahoogroups.com
> Sent: Sunday, March 28, 2010 4:38 PM
> Subject: Light-Sport Aircraft Yahoo group Re: Maxpro Battery monitor
>
>  
>
> I had to find the pdf as the link would work directly.
>
> Here's a direct link:
>
> http://williams.best.vwh.net/smxgigpdf/smx2003.pdf
>
> Good reading ... thanks!
>
> Dale
> N28YD
>
> --- In Sport_Aircraft@yahoogroups.com, "Richard Williams" <rkwill@...> wrote:
>
> > One way to help determine if the ride is going to be bumpy is:
> > Check the lapse rate. If it is less than 3 degrees per 1000' then
> > things will be quite smooth if it is over 12 degrees per 1000' then
> > things will be wildly rock and roll.
> > Intervening lapse rates will be bumpy but probably not totally rock
> > and roll. <SNIP>
>
>

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