The Wall Street Journal used the following graphic to compare hurricanes Ida and Katrina (link to paywalled article).

Wsj_ida_katrina_hurricanes

This graphic illustrates the power of visual communications. Readers can learn a lot from it.

The paths of the storms can be compared. The geographical locations of the landfalls are shown. The strengthening of wind speeds as the hurricanes moved toward Louisiana is also displayed. Ida is clearly a lesser storm than Katrina: its wind speed never reached Category 5, and is generally lower at comparable time points.

The greatest feature of the WSJ graphic is how the designer stitches the two plots into one graphic. The anchors are two time points: when each storm attained enough wind speed to be classified as a hurricane (indicated by open dots), and when each storm made landfall in Louisiana. It is this little-noticed feature that makes it so easy to place each plot in context of the other.

Bravo!

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