With an unexpected early initiation, got a late start on the day and missed the central OK action. Blair and I eventually made it to the KS/OK border in an attempt to either intercept the long lived supercell moving out of central OK or any additional convection that may form on the leading edge of the theta e surge. We finally met up with the Gutherie, OK supercell as it neared Pawnee, OK. Around 5:30 pm, we stopped just south of Pawhuska, OK on Hwy99 and watched as the updraft base became visible. Decent mid-level (with some weak low-level) rotation briefly became evident within the notch region. Thereafter, the storm seemed to struggle as we followed it north of Bartlesville, OK where we encountered 1.5″ hail.