Electric field impulses and radar echo signal from lightning were measured synchronously. The measured electric field was used to calculate currents in return strokes which were used in numerical modeling of lightning discharge. On the basis of this simulation the radiowave reflection from a lighting channel was calculated. From the comparison of measured and computed radar echo signals the validity of the lightning discharge and the radiowave reflection numerical model was stated. Also, a continuous current was found between the return strokes. ¿ American Geophysical Union 1994