The heat and humidity built throughout the day.  As evening approached the sun and blue skies gave way to towering white thunderhead clouds to the south.  Quickly the darker clouds moved in, the sky took on an eerie gun-metal gray and gold, and the wind grew still.  I wandered through the cornfields watching and listening.  In a short period of time there was lightning in the area.  I erred on the side of caution and decided a woman with a tripod in the middle of a cornfield with lightning around was not a good idea.  Within minutes of that decision, the winds picked up and the rain came down.