A ten minute exposure, made in the darkness of a heavily overcast midnight, revealed details about a passing lightning storm. Two heavy active cloud cells created numerous lightning bolts. The electrical activity in the lower left of this photograph was mostly hidden from me. It just exposed the top of the cumulus column by silhouetting it with each flash. The three cloud-to-ground lightning bolts in the lower right corner displayed the filaments of energy pushing out from the main current. While these powerful forces were working, the thin cloud cover stretched across the center revealed wispy, ragged clouds being pulled and torn by the storm.