National Weather Service United States Department of Commerce

El Paso, TX

Weather Forecast Office

Showalter Index Calculator

Weather.gov > El Paso, TX > Showalter Index Calculator

Showalter Index

by Tim Brice and Todd Hall
 
Enter the 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?
 

 

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