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Rackliff Index calculator



Enter the 850 hPa ThetaW (C)
Enter the 500 hPa temperature (C)
The Rackliff Index is


RI    25 :           showers possible.
RI    25 to 29 : showers with thunderstorms possible.
RI    >30 :         thunderstorms likely.

The Rackliff Index is best used for air mass thunderstorms (no dynamical triggering mechanism).


Formula used: RI = Tw850 - T500




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