"On Saturday, officials at the National Weather Service in Morehead City, North Carolina, announced that one of Friday's tornadoes in eastern North Carolina rated an EF3 on the Enhanced Fujita Scale.
The April 25 tornado marked the latest wait by far for the first such tornado in any year in modern records dating to 1950, according to the University of Alabama-Huntsville. While we have had several episodes of severe thunderstorms in 2014, we've been fortunate enough to avoid the volatile combination of low-level wind shear (rapidly changing wind direction and speed with height) and strong instability (very warm and humid air near the surface topped by cold, dry air aloft) known to spawn large, destructive tornado outbreaks."
http://www.weather.com/news/tornado-central/record-latest-first-ef3-tornado-2014-20140408
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