The flight of July 29 was called to describe the unusually weak monsoonal flow up the Gulf of California. This flight would be classified as a moisture flux flight, with modifications to sample the sea-breeze penetration along the eastern shore of the Gulf of California. The takeoff was later than normal - 1036 LT, and the flight was flown in the reverse sense - out first over the Pacific, to arrive over the coastal plain near Obregon by mid-afternoon. The track was modified to avoid Culiacan terminal airspace, hence the kink in one of the return legs. An near-overflight of the Altair was carried out, SST's measured at this point by the P-3 were 29.9 to 30.0°C. Overall, extremely weak winds were encountered over the Pacific, with a very shallow moist layer. Very dry air was found here at 900mb, some with dewpoints of -10C. Westerly winds were found over the Baja California peninsula, but over the gulf at the lowest levels the winds were southeasterly. The sea-breeze zone was described by 4-transects, with potential temperature ranging form 302K over the Gulf to about 308K far inland. Winds shifted from southwesterly along the coast to northwesterly far inland. The region was free of significant convective storms, only scattered cu and a few towering cu were present. Water temperature in a bay near Los Mochis was measured (downward radiometer) to be 32C! .