SUMMARYStatistical evidence is adduced to support the contention that significant patterns are discernible in An objective method is presented for determining : (a) the percentage of the variance of a given data field which is explainable using a statistical objective analysis technique on a specified observational network, (b) the principal wavelengths present in the data field, (c) statistically determined weight curves for the objective analysis of the field.Space autocorrelation shows a 1,700 nautical mile wavelength to be dominant in the tropospheric divergence fields and the noise level to be about lo+ sec-'. The case history of a developing storm is presented and the divergence patterns associated with various aspects of the development are shown to be in agreement with synoptic experience.fields of divergence values computed from the horizontal winds using the Bellamy triangle technique.