The deadly tornado that swept through Oklahoma was only the most recent storm to hit the area. This visual analysis of tornado data from 2000 to 2012 shows the frequency and intensity of tornadoes in the United States, with many resulting in injuries, significant property damage, and loss of life.

3-1-2000

Tornado intensity

Map key

This map shows of tornadoes observed in the United States from 2000 to 2012.

The size of the circle corresponds to the intensity of the tornado as measured by the Fujita scale (and Enhanced Fujita from 2007 onwards). Smaller circles are weaker tornadoes, and larger circles are stronger.

Use the slider to change dates, or press play to see it animated through. Data courtesy NOAA Storm Prediction Center. Click here to see 1950 - 2012 (Chrome only).