This map service displays the least, most and average number of violent tornados by US state and county from 1950 to 2010. Variance information is also provided in addition to information on total historic fatalities and injuries. Violent tornados are defined as ones with Enhanced Fujita scales classifications of EF4 or EF5 or ones with 3 second wind gusts exceeding 166 mph (http://www.spc.noaa.gov/faq/tornado/ef-scale.html).
This map depicts tornadoes and violent tornadoes per decade decade from 1950 to 2009, including data from 2010 and 2011. The purpose is to show the change in tornado frequency by US County, State, and urban areas over the last six decades. Also shown is the total number of violent tornadoes, classified as category four or five on the Fujita Scale by the National Weather Service. The final decade contains data for 2010 and 2011 only. At the largest scales, tornado and violent frequency is shown by urban areas. Pop-ups contain information about the total numbers of violent tornadoes, injuries, and fatalities by state. The National Oceanic and Atmospheric Administration and US Census Bureau provided the data for this map.
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{'Title': 'Statistics on violent tTornados in the United States', 'Author': 'Esri', 'Comments': 'This map service displays the least, most and average number of violent tornados by US state and county from 1950 to 2010. Variance information is also provided in addition to information on total historic fatalities and injuries. Violent tornados are defined as ones with Enhanced Fujita scales classifications of EF4 or EF5 or ones with 3 second wind gusts exceeding 166 mph (http://www.spc.noaa.gov/faq/tornado/ef-scale.html).', 'Subject': 'Historical statistics for violent tornados by state and county from 1950 to 2010.', 'Category': '', 'AntialiasingMode': 'None', 'TextAntialiasingMode': 'Force', 'Keywords': 'tornados,tornadoes,NOAA,United States,tornado tracks,Enhanced Fujita Scale,wind speed'}
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