I (Kathryn) got off of work about 2:30 in the afternoon...Jeff called and said that small cells were firing ahead of the cold front west of Tulsa.   I went out to my car and fired up XM Weather and looked up parameters on my iphone...there was a pocket of low 70’s dewpoint that was coming up from the Southeast but it was pinched off from the main source of moisture...this concerned me...but I continued to move east and stopped East of Tulsa and watched as this gorgeous storm developed.