Question

Sounding plotted on skew-T diagram

What is the K index for this sounding?
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KI =

KI = 38
KI = (T850 - T500)
       + Td850
       - (T700 - Td700)
   = (18 - (-15)) + 13
       - (7 - (-1))
   = 38

What is the potential for thunderstorm activity?
a. Low
b. Moderate
c. High
Correct. The K index value of 38 indicates a potential for widespread thunderstorm activity in the sounding area.
Incorrect. Recall that thunderstorm probability ranges from very low when KI < 20 (KI < 15 west of the Rocky Mountains) to a likelihood of widespread activity when KI > 35 (KI > 30 west of the Rocky Mountains).
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