Comment Re:image lightning? you mean seed lightning (Score 4, Interesting) 49
Hardly. The field strength between thunder clouds and the earth alone is not enough for lightning.
Yes there are a million volts present. No that is not enough to arc over 1,5 km (1 mile) (distance bottom of an average thunder cloud to the ground). It is approximately enough for 100 meters (1/15th of the required distance) according to the 1 kV/cm rule of thumb.
Current theory states that high speed cosmic particles ionize the air so the lightning can arc.