On the afternoon of May 24, 2008 an isolated supercell thunderstorm developed over north-central Oklahoma, to the northwest of Oklahoma City, and quickly became tornadic as it moved slowly east-northeastward. The cyclic cell became a prolific tornado producer and, over a four hour period, generated no less than 15 individual tornadoes... possibly more. That morning our chase team (Michael Laca, Jim Leonard, Ray Walker, Eric Baker and Max Hagen) began the day in Hutchinson, Kansas and had opted to forego a northern chase target in Nebraska, in favor of an area of less vertical shear but deeper moisture to the south in Oklahoma. As we headed south on I-35 we quickly noticed the rapidly developing tower well to our southwest, and it wasn't long before we started hearing reports of confirmed tornadic activity in the Bison/Hennessey area (one of these tornadoes was made famous through widely seen aerial footage as it destroyed a hog farm near Hennessey). Assuming the activity was going...