After arriving in Boulder, I noticed flashing light off to the east through the trees. I couldn’t hear the thunder, but lightning was striking every half second in the thunderstorm over the plains. I drove up the hill near the NCAR Mesa Lab and took a few 30-second exposures of this storm cloud before heading to bed.
Lightning Storm from South Boulder (#2), Boulder, CO (12″x18″)
Lightning Storm from South Boulder (#4), Boulder, CO (12″x18″)