MA Thunderstorm was sired by Ima Doc O'Lena ($ 27,118.36), 1983 PCCHA Derby Open Champion, 1983 World Champion Junior Cutting Horse, 1984 World Champion Senior Cutting Horse. NRHA All-Time Leading Sire, NRCHA Futurity Open Champion Sire, ApHC Hall of Fame inducted. A leading sire of performance horses and point-earning performance horses.

MA Thunderstorm is out of the Superior Bronze Production Plaque mare Ms High Five, by High Sign ($ 12,588.20), 54-Time National or World Champion in Reining, Judged & Timed Roping, Heading & Heeling, Steer Daubing, Cutting & Working Cow-Horse classes. ApHC Versatility Champion, ApHC Superior Reining Horse, ApHC Superior Timed Calf Roping Horse. ApHC Hall of Fame inducted.