My target was the warm front as close to the surface low as clearing/heating would allow. I-64 between Mount Vernon, IL and Evansville, IN seemed to be where this was setting up, with the warm frontal zone more or less right along I-64. I incrementally moved east with each new storm moving up from the south, starting at Belle Rive and ending at Burnt Prairie. The Burnt Prairie storm had the best chance, with no upstream storms to foul its inflow. As it approached, an RFD clear slot rapidly cut in. A lowered area that looked very much like a tornado was visible, right where one would expect - but it was not clear enough to confirm, and motion did not appear to be very strong: The RFD filled with precip and surged across I-64 as a strong low-level circulation appeared to be 30 seconds from producing, with tightly-rotating cloud tags and a brief rope funnel visible. I paralleled this feature on the only county road just north of I-64, but lost it as the RFD precip overtook me. A cylindrical updraft was visible above the rain as the strong RFD carved around it. I caught up to this feature again just south of Albion. The RFD winds imploded a small grain bin next to the road. Creeping north through the RFD precip, I finally broke through, but the storm quickly vanished to nothing right as it reached Albion. With all other storms either out of reach to the northeast or behind the outflow from the Albion storm, I was out of plays, and headed home.