The New York Times uses layering to place the Alabama tornadoes in context. (link)

Today's wide availability of detailed data allows designers to create dense data graphics like this:

Nyt_alabamatornado_3

The graphic shows the starting and ending locations and trajectory of each tornado, as well as the wind speeds (shown in color).

Too much data slows down our understanding of the visual message. The remedy is to subtract. Here is a second graphic that focuses only on the strongest tornadoes (graded 4 or 5 on a 5-point scale):

Nyt_alabamatornado_2

Another goal of the data visualization is to place in context the tornado that hit Beauregard:

Nyt_alabamatornado_1

The area around Beauregard is not typically visited by strong tornadoes. Also, the tornadoes were strong but there have been stronger ones.

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The designer unfolds the story in three stages. There are no knobs and sliders and arrows, and that's a beauty. It's usually not a good idea to make readers find the story themselves.

Tags:
junkcharts
http://junkcharts.typepad.com/junk_charts/

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