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Total-Totals index
A stability index and severe weather forecast tool, equal to T850 + Td850 - 2 T500.
The SWEAT Index and Total-Totals Index The SWEAT Index was derived by the Air Force, not for putting cadets through basic training but for indicating the potential for severe weather to pilots.
TT is the total-totals index,
f 850 is the 850-mb wind speed (in knots),
f 500 is the 500-mb wind speed (in knots), and ...
The total-totals index is the arithmetic sum of two other indices: the Vertical Totals Index (temperature at 850 mb minus temperature at 500 mb) and the Cross Totals Index (dew point at 850 mb minus temperature at 500 mb).
Sounding-based Stability Index - an index calculated from balloon observations (e.g., CAPE, Lifted Index, K-Index, Bulk Richardson Number, Total-Totals Index) that provide guidance about the potential organization, type, ...
true value; in other words, how close a predicted or measured value is to the true value.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: bias, Delta T, Li, Lifted Index, MLLI, MULI, Sweat, Total-Totals Index ...
 See also: Rotation, Atmosphere, Surface, Forecast, Air
  
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