Abstract <p>The results of engineering calculation of basic electrophysical characteristics of a three-phase dispersed system of the Earth troposphere “storm cloud–earth,” in the cloud of which a bearing gaseous air phase contains fine liquid water drops and small solid dielectric particles, are presented. The obtained results will contribute to a possibility of predicting thunderstorm conditions in the Earth troposphere with the minimal initial meteorological information, the further development of the the physics of the linear lightning and solving the problem of the lightning protection of air and ground facilities and their personnel.</p>