In this paper, a thorough study of radiowave propagation phenomena in the presence of wildfires, is presented. Electrical modelling of a fire environment based on computational fluid dynamics is revisited. Modelling of the fire phenomena in terms of its refractive index and combustion of cold plasma lays the foundation for considering the fire environment as a propagation medium. Electrical models are formulated that are used to provide means of calculating propagation characteristics based on thermalionisation to create a plasma surface under fire environments and, thus, to determine of the excess loss arising in the burning area. The paper presents initial results for single trees under fire at 385 MHz, envisaged to assist in the identification of radio exclusion zones in real-time during wildfires, in mission critical applications.