https://weather.com/storms/severe/news/why-tornado-not-warned
The National Weather Service issues hundreds, if not thousands, of warnings ahead of likely or already occurring tornadoes, but occasionally, some tornadoes slip under the radar.
In fact, the NWS missed more than 25 percent of tornadoes from October 2007 to September 2016, according to the National Centers for Environmental Information
THANKS OBAMA!!!