Obvious thunder and lightning clearly mandates turning around, but one time up Whitney I reached Trailcrest to see a storm brewing around the Great Western Divide. I continued up to the summit, and after a few minutes on top, felt some faint electric shocks from the metal in my boots. There was no sign of lightning or thunder, not even around the Great Western Divide (where it was clearly raining at that point). Needless to say, I rushed down the mountain. I noticed a similar thing near the top of Forester Pass once. Does anyone know what causes this, and might this have been the prelude to some real electricity?