May 13th was a fairly marginal day as forecast. Some models tried to break out storms in southern Kansas and northern Oklahoma. We decided to chase down by the OK/KS border area and see if anything would form. Indeed it did! A couple of slow moving LP supercells developed and had decent structure and golfball hail. During the early evening hours, another supercell formed just southwest of the now decaying storms and became a formidable storm! Structure was of the classic supercell type and is spun like crazy in the dark. At one point we though it could even produce a tornado due to strong low level rotation. However it was not to be. A fun day, some good storms and great lightning in the night!