Centro de Lançamento de Alcântara is the main Brazilian launching center. In spite of presenting several desirable aspects, due to its proximity to the Equator, it has a peculiar topography because of the existence of a coastal cliff, hich modi es the characteristics of the atmospheric boundary layer. his may affect roc et launching operations, especially hen associated ith safety procedures. his or is a continuation of previous experimental studies about the air o pattern at this launching center. An improved ay of simulating the atmospheric boundary layer in a short test section ind tunnel using passive methods is presented here. It is also presented a preliminary analysis of the air o pattern in Centro de Lançamento de Alcântara, at speci c positions as the edge of cliff and around the mobile integration to er, from ind tunnel measurements using particle image velocimetry. hree values of eynolds number, based on the coastal cliff height, l, ranging from 6.8×105 to 2.0×106, were considered.