Hovering silent craft red and green lights flashing. 20 minutes in one spot weird lightning appearedRed and green flashing lights on craft. craft hovered_ stood still in the sky. no sounds heard. lower than an airplane designated flight path. hovered lower, than rose a bit. multiple lightning flashes that converged into one line appeared to its north side_very unusual pattern. no thunder followed lightning_this may have noting to do with craft. craft than slowly rose than disappeared from sight (unable to discern if it disappeared or moved father off/out of view) this was witnessed by several people over the course of a half hour or a bit less) craft simply sat in the sky...the word "drone" was used in conversation but it was larger than any conventional "drone". again, this was totally silent. no engine, propeller, turbine was heard at any time.