Extreme precipitation events for the central US are influenced by a continental-scale, dipole-like circulation pattern that appears to modulate the transport of moisture from the Gulf of Mexico. The influence of the large-scale circulation on moisture transport from the Gulf and related changes in the occurrence of extreme precipitation is examined through trajectory analysis using the NOAA HYSPLIT model. The influence of the dipole mode on average trajectory and the implications for moisture transport is examined, as is the difference in moisture trajectories for extreme and non-extreme events.