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better to look at this cloud minimized but what you see is a closer up of virga. virga is rain that doesn't hit the ground, so it evaporates before touching.
usually you see a couple signs before lightning
1) dark virga
2) cloud to cloud lightning or rumbling
If you are close enough to a cumulonimbus, use a radio that produces static when you aren't connected to any radio channel. Point the antenna at the cloud and if there is cloud to cloud you can't see, you will hear a spurt in the static that it picked up as feedback. Only works so close to a cloud and usually if you hear it you don't want to be outside, under a tree, or at the cat walk of the tower.
