The Navy Oceanic Vertical Aerosol Model (NOVAM) has been under development for some time. The model showed considerable promise in its first verification test during the First International Satellite Cloud Climatology Project (ISCCP) Regional Experiment (FIRE) in the eastern Pacific. Because much of the development work on NOVAM was done in this oceanic region, the model needed to be tested in very different environments to see just how universally it could be applied to other regions. KEY-90 was an experiment carried out in the tropical waters between the Florida Keys and Cuba in July 1990 to test the model. It included investigators from the U.S., U.K., and the Netherlands. The experiment included two lidars, two aircraft, a small boat, buoys, and several shore installations. The experiment provided an excellent database not only to test the model for the tropical water scenario, but also to further investigate the convective marine boundary layer and to enhance further modeling schemes in this region. This paper describes the optical, IR, and meteorological measurements made during KEY-90 and shows the comparison between the NOVAM model predictions and measurement.