Chasing Tornado Data : Exploring Three Decades of Violent Storms


This storymap is based on storm reports used in the NOAA’s National Weather Service’s verification of storm events. Larger symbols indicate the higher intensity events based on the Enhanced Fujita Scale. If tornado track data exists, it is shown as a line from the start point to end point. Although tornadoes can occur throughout the year, prime time for twisters in the U.S. is spring and early summer. Larger symbols show more violent tornadoes. Zoom into the map to see approximate tornado tracks.

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El Niño: Mapping Disaster Risk

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The World Meteorological Foundation predicted the 2015-2016 year’s El Niño would be among the strongest on record. The last El Niño of comparable strength, which occurred between 1997 and 1998, brought more than 20 inches of rain to parts of California, caused widespread flooding and landslides, and inflicted billions of dollars in damages. Thirty-five counties were declared federal disaster areas, and 17 people lost their lives.

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