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Showalter Index by Tim Brice and Todd Hall   Enter a temperatures that you would like: Enter the 500 millibar parcel temperature: °C Answers: Enter the 500 millibar environmental temperature: °C What does my answer mean? Showalter Index greater than 0: Stable, but weak convection possible for SI = 1-2 if strong lifting is present. Showalter Index between 0 and -3: Moderately unstable. Showalter Index between -4 and -6: Very Unstable. Showalter Index between less than -6: Extremely Unstable.   What is the formula for the Showatler Index?  (Coming soon)

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