After much deliberation a flight was called for July 18th to investigate the detailed flow structure around the southern part of the Baja California peninsula. A relatively short flight pattern (flight totalled 5.0 hrs block time) was designed to measure the suspected gap flow across the lowest part of the Peninsula near La Paz and the directional shift in the winds south of Cabo San Lucas.. The effect of the significant SST gradient in this region on the depth of the PBL and its moistening was also of interest. The flight is officially a moisture flux flight. The flight pattern was contorted to avoid as much as possible the controlled airspace near the airports of the region. Some flight across this airspace was necessary but fortunately there was good communication with the ground controllers and few problems were encountered in carrying out the flight. Porpoising was done throughout the flight, with the highest altitudes being 8,000 ft; most ascents reached only 4-6,000 ft. The flight found southerly and southeasterly winds over the southernmost Gulf of California, with southwesterly winds south of Cabo San Lucas. Near Cabo there was a sharp directional wind shift from NW-ly flow west of the cape to SW and S flow just east of Cabo. This was associated with a well defined cyclonic vortex at 925mb in this area. The NW-ly flow over the Pacific was very shallow; the SE flow over the gulf was much deeper. Weak southerly flow was present over the gap near La Paz; this might have been stronger but minimum altitudes over land (100 ft AGL) prevented sampling this near-surface flow. All in all, this fight should be useful for describing the effect of the topography on the near-climatological flow around the Cape of Baja California and the variation in PBL structure about the SST gradient in this region.