With the Fujita Scale obsolete, tornados are now measured by the Enhanced Fujita Scale (initiated February 1, 2007). Video helps point out an RFD (rear flank downdraft), gust-front, funnel and forming wall cloud. Then storm chasers proceed to nighttime tornados — two in the same night.
Video of daytime wall cloud, zippy scud clouds and a trailing shelf cloud; and two Eastern Kansas nighttime tornadoes on February 28 in Linn County (reported by TornadoVideodotnet).
Colony, Kansas: EF-1 tornado at 7:00 pm CST
Just northwest of Blue Mound, Kansas: EF-4 tornado at 7:24 CST and powerflash.