For many years it has been known that tornadoes accompany most, if not all, landfalling Tropical Cyclones (TCs) in the United States. Much research has been done on the thermodynamic and kinematic environments of TCs to determine why this is, and to determine if there is a way to forecast the number of tornadoes a landfalling TC is likely to produce. Past research has indicated that many TC Tornadoes are produced by shallow supercells embedded in the rainbands of TCs. As the Storm Prediction Center has a metric, Supercell Composite Parameter (SCP),for determining potential formation of supercell thunderstorms, the question is asked whether SCP can be applied to TCs as well, and whether it can be used to discriminate between outbreak" and "non-outbreak" TCs. All U.S. landfalling TCs from 2000-2010 are studied and statistical methods are applied to determine that SCP is correlated with tornado occurrence and that SCP can be used as a discriminator between "outbreak" and "non-outbreak" TCs."