1. A computer-implemented method of displaying a probability of cloud-to-ground lightning comprising: displaying on a visualization device the probability of cloud-to-ground lightning discharges in a predetermined geographic area with respect to a geographic map; and superimposing upon the visualization device geographic structures such that locations of the probability of cloud-to-ground lightning discharges may be visually compared to locations of structures, wherein the probability of cloud-to-ground lightning discharges is determined by receiving polarimetric radar data and executing a cloud-to-ground lightning probability module to compare a maximum height of graupel to a minimum height of ice crystals and to apply a probability density function.