Mean heat and momentum budgets for the upwelling region off northwest Africa during March and April 1974 are estimated at midshelf, 32 km from the coast, using current and temperature measurements at six depths in 73 m of water. In the heat budget, the mean cross-shelf circulation transports 1.14¿107 W m-1 offshore, while fluctuations in the cross-shelf circulation transport an additional 1.9¿106 W m-1 offshore. This offshore heat flux is compensated by the net radiative heat gain in the region of 4.8¿106 W m-1 and an alongshore heat flux due to the mean circulation of 5.1¿106 W m-1 as indicated by southward cooling of the surface mixed layer of 0.5 ¿C per 100 km. In the cross-shelf momentum budget, the alongshore flow is nearly geostrophic with the Coriolis force being approximately balanced by the steric sea level slope. For the alongshore momentum budget, the surface wind stress is balanced by the bottom stress, alongshore pressure gradient, and Coriolis force associated with the net onshore mass transport. A three-dimensional momentum balance with singificant alongshore pressure gradients results even if the coordinate system is rotated 6¿ counterclockwise so that no net cross-shelf mass transport occurs.