Tornado chart generator

Visual Encoding & Comparative Anatomy

A tornado chart (or tornado diagram) is a specialized, paired horizontal bar chart used to compare two opposing metrics or rank variables by their positive and negative impact on an outcome. Visually, the bars diverge outward from a central vertical baseline axis. By sorting the variables from the largest total variance at the top to the smallest at the bottom, the overall shape resembles a funnel or tornado. Trendalyzer renders tornado charts entirely locally in your browser, guaranteeing your data is never uploaded to an external server.

Input Format & Required Columns

Format input columns for tornado chart with explicit headers and numerical measurements. Verify that rows represent discrete categories or observations without unformatted symbol artifacts.

Example Comparison Table

| Risk / Driver | Low case | High case |

Best Practices for Category Comparison

• Ensure sufficient visual distinction for tornado chart marks across standard and high-contrast viewports.
• Align text labels horizontally whenever possible to improve cognitive readability for tornado chart elements.
• Double-check scale boundaries and zero-anchors before exporting tornado chart presentation artwork.