the Total-Totals Index (TTI). * TTI
o The orange and yellow bars indicate the value of the TTI.
o TTI is a derived index, and is dimensionless.
o TTI is a measure of the vertical stability of the atmosphere, and over central and eastern North America is also a good indicator of the potential for severe weather.
o Values of TTI of around 40-45 indicate the potential for thunderstorms. Around 50, severe thunderstorms are possible.
Around 55, storms producing tornados are possible. This rule-of-thumb does not hold over western North America where there is alot of high terrain (Rocky Mountains and West Coast).
o The base line for the bar graph of TTI is 40.
08495 LXGB Gibraltar Observations at 12Z 06 Oct 2003
Station information and sounding indices
Station identifier: LXGB
Station number: 8495
Observation time: 031006/1200
Station latitude: 36.15
Station longitude: -5.35
Station elevation: 4.0
Showalter index: -2.09
Lifted index: -2.87
LIFT computed using virtual temperature: -3.14
SWEAT index: 263.85
K index: 31.10
Cross totals index: 26.30
Vertical totals index: 26.70
Totals totals index: 53.00 Convective Available Potential Energy: 496.43
CAPE using virtual temperature: 570.24
Convective Inhibition: -0.24
CINS using virtual temperature: -0.12
Equilibrum Level: 337.40
Equilibrum Level using virtual temperature: 336.17
Level of Free Convection: 949.41
LFCT using virtual temperature: 951.22
Bulk Richardson Number: 11.05
Bulk Richardson Number using CAPV: 12.70
Temp [K] of the Lifted Condensation Level: 288.97
Pres [hPa] of the Lifted Condensation Level: 958.59
Mean mixed layer potential temperature: 292.49
Mean mixed layer mixing ratio: 11.94
1000 hPa to 500 hPa thickness: 5600.00
Precipitable water [mm] for entire sounding: 34.23
Sondeo de Gibraltar