The problem of electromagnetic tomography and monitoring of cloud formations can be solved taking into account the size and parameters of the formation medium and the range of electromagnetic waves used. It is shown that for the analysis of large-scale weak formations it is necessary to use the range of ultra-long waves (wavelength of about 3 km) and conduct monitoring on the ground wave. Radio navigation systems of this range should be used, the choice of wavelength range of which is made taking into account the integral influence of formations on the phase structure of the electromagnetic field. The results of monitoring are proposed to be used as a set of expert assessments of the decision-making system.
