Hello:
Early a.m. Saturday, about 4:30 Pacific Time (1@:30), I was observing the big rain storm when the sky lit up, a big wide swath of smooth white, no zig zag lightning and NO sound.
That was very similar to florescent lamp action, almost as if the rain cloud itself was florescing internally !
The white light extinguished in separate little falters with slow reduction to dark, again.
Next, another burst after about 5 minutes, this time straight overhead. Funny thing was, that overhead cloud seemed to be 'leaking' current down, down to around neighbor's chimney, crackling the whole time. Maybe 2 seconds total, and this time followed (soon), by a peal of thunder.
That seemingly ground-headed 'leader' thing was kinda scary, especially for anybody caught out in the electrical storm !
WTF ! Was this Ball Lightning ?