"The importance of simulating atmospheric flows in wind tunnels has been well established. Experiments were conducted in the Modified Aerodynamic Wind Tunnel to determine the suitability of this wind tunnel for simulating atmospheric flows and the degree to which various aspects of modeling could be fulfilled. A temperature profile to simulate the inversion aloft was generated inside the test section, and then an appropriate velocity profile was built in by means of screen mesh arrangements. The turbulence characteristics of the flow were measured. The validity of the temperature, velocity and turbulence fields were examined. It was found that while the temperature and velocity profiles were quite valid, the turbulence generated by the screen mesh arrangement was too high. The test section being short, turbulence could not be damped out to the required level. A model smoke stack was introduced into the test section to observe the effect of the modeled inversion on the plume. The smoke velocity could not be effectively controlled, and the plume could only be observed a very short distance downstream. Therefore, the plume path was not very realistic. Other smoke tests in the test section showed maximum turbulence at the surface and no significant change when the temperature profile was introduced"--Abstract, leaf ii.