Total Totals Index

The Total Totals Index is actually an amalgamation of two indices: Vertical Totals and Cross Totals. Like the K-Index, the Total Totals index focuses purely on instability in the middle levels of the atmosphere and does not account for wind shear or surface conditions. In general, values of less than 42 suggest a low potential for convection, whereas values of over 55 indicate a high potential for convection, possibly exceeding severe limits. Like all severe weather indices, forecasters should carefully evaluate surface conditions and other atmospheric dynamics that may inhibit or encourage convection.