Thunderstorm Sky

When we had thunderstorms around recently, I was down at the water and saw these interesting cloud formations.  I was using the weather radar display on my iPhone, so knew that there were some thunderstorm cells to the west of me - the direction that I am looking in this picture.  I could see the storm moving south and the gray clouds started covering up the whole sky.  I jumped on my bike and got out of there before the storm hit.  But the clouds really were beautiful.