The development of a weak tornado in association with this multicell severe thunderstorm is examined. It is shown that the synoptic environment was not conducive to tornado formation because of weak low-level wind shear with little veering of the low-level flow away from the boundary. However, there appears to have been sufficient storm relative environmental helicity along the boundary to result in a persistent low-level mesocyclone. Time-height trends of the mesocyclone show that each of at least three cell mergers resulted in the strengthening and deepening of the mesocyclone and eventual tornado formation. The strength of the mesocyclone and the radar-indicated tornado vortex were considerably weaker than is shown in previous work referencing similar tornadoes. In fact, the mesocyclone and TVS became strongest after the tornado occurred. A successful tornado warning decision was made based upon the storms course parallel to a well-defined surface boundary, tight low-level circulation, and low lifting condensation levels. This study documents a case in which radar analysis was augmented by knowledge of the near storm environment to issue a successful tornado warning in a synoptic situation that was not considered conducive to tornadogenesis.