Clear Air

Taken at Lightning Ridge N.S.W. on the 24.10.07 at 8:49pm during a nice storm carrying an RFB on it's front which is always nice for lightning photography. The lower level cloud (near the ground) is known as a roll cloud and is very rare here. It was only that the humidity was freakishly high during this storm event that it appeared, luckily it did
I have never seen one before this, and subsequently haven't seen one since?