As CAPE goes up the chances for thunderstorms increase. As LI goes down
the chances of severe weather increase. There are other factors involved
(moisture, temperature, topography, whole - atmosphere) but CAPE that
high and LI that low are not common in the UK.

This is from Bernhard Oker's website:

LIFTED INDEX:
0 Thunderstorms unlikely
0 - -2 Thunderstorms possible - trigger needed
-3 - -5 Thunderstorms probable
-5 - -7 Strong/severe thunderstorms. Tornadoes possible
-7 - -9 Move to Alaska
-9 Yikes

CAPE:
300 Weak convection (showers)
300-1000 Weak thunderstorms
1000-2500 Moderate thunderstorms
2500-3000 Strong thunderstorms
3000+ Very Strong thunderstorms

Col wrote:
"Les Crossan" wrote in message
. uk...

If this comes off it's going to get a tad scary.... thunder almost
certain along with hail, gusty winds, torrential rain, tornadoes.....!!



Cape/Lifted Index.

Am I right in thinking that this is in simplistic terms, a measure
of atmospheric instability?

Col

--
Les Crossan,
Wallsend, Tyne & Wear
54.95N 1.5W
Home of the Wallsend StormCam and the Backup USW FAQ -
www.uksevereweather.org.uk