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There's a new tornado sherrif in town http://www.news9.com/story/22498918/national-weather-service-upgrades-el-reno-tornado-to-ef-5
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The EF scale is completely based on damage caused by the tornado. Here's a decent chart giving more details if you're interested. The wind speeds are essentially estimates of what it would take to cause the corresponding damage. http://www.srh.noaa.gov/images/ohx/EF-Ratings.png