TBSS and Golf Balls Posted in General on June 9, 2015 by Tiffany. Very pronounced TBSS on a cell just north of KMSP. Storm has produced golf ball size hail at 713 CST. NOAA/CIMMS Severe Prob near 90%. Not crazy about the color bar right over the top of the base data color bar. Maybe it could go just below? MrSnow.