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Computations of divergence and vorticity are made by the tri-angular method for six 100-mb layers (1000-400 mb) for those obser-vation times (11) when wind data is available from eight stations in the BOIMEX region during the period 11-28 July 1969 (Phase IV). The results are compared to cloudiness from satellite pictures. Contemporary correlation coefficients between vorticity and di-vergence in the six layers ranged from-.19 to +.26. The corre-lation in the lowest layer (1000-900 mb) (where Ekman theory pre-dicts a large (--1.0) negative correlation) was-.19. The vorticity and divergence values had the same sign in approximately 50r of the sample. Despite the low values for the correlation coefficients, the comparison of the results to satellite pictures is encouraging in that convergence and cyclonic vorticity are associated with re-gions of maximum cloudiness. When algebraic means are compute