Question

Sounding plotted on skew-T diagram

What is the Total Totals index for this sounding?
Enter your answer in the text box below, then click Done.

TT =

The correct answer is 61.
TT = (T850 + Td850)
        - (2 * T500)
    = (18 + 13)
        - (2 * (-15)
    = 61

Note that the Total Totals index value also appears in the parameters listing to the right of the plotted sounding on the interactive skew-T.

What is the potential for severe convection?
a. Low
b. Moderate
c. High
Correct. The TT value of 61 indicates that severe thunderstorms are likely, with the possibility of tornadoes.
Incorrect. Recall from the table on page 1 that a Total Totals index of 55 or greater indicates that severe thunderstorms are likely, with possible tornadoes.
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