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A tornado diagram is a graphical summary of one-way sensitivity analysis that displays the influence of individual parameters on a model's result, drawing a horizontal bar for each parameter whose length represents the range of outcomes produced as that parameter is varied across its plausible range. The bars are arranged with the most influential parameter at the top and the least at the bottom, giving the chart its characteristic tapering, tornado-like shape and making it easy to see at a glance which inputs matter most to the conclusion. It helps analysts and decision makers focus attention on the assumptions that drive results and that may warrant further evidence or scrutiny. It complements probabilistic analysis, which conveys the combined effect of all uncertainty rather than the influence of parameters individually.

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