Positive CGs usually consist of only one return stroke, which is typically very bright and intense relative to other lightning activity in a storm. Most positive cloud-to-ground lightning strikes can be identified visually and in photographs by their distinctive lack of branching, especially close to the ground (positive CGs occasionally will have branching at higher altitudes, but rarely near the ground). Positive CGs are less common than negative CGs, and usually are associated with supercell thunderstorms and trailing stratiform precipitation regions behind squall lines. PHOTOS: Cloud-to-Ground Lightning GalleryĪ lightning discharge between cloud and ground where the positive end of an in-cloud bidirectional leader descends to the ground via a positively-charged leader. The first return stroke of a negative CG is usually the only branched one - the branches usually do not illuminate again in subsequent return strokes.ĪRTICLE: In-depth look at cloud-to-ground lightning Negative CGs commonly consist of multiple "return strokes", which are additional pulses of current that illuminate the channel again and again. Negative cloud-to-ground lightning strikes can be identified visually and in photographs by their distinctive downward branching (aside from the portion of the channel very close to the ground, where upward leaders can be branched upward). Most of the lightning you can see striking the ground in a storm is of the negative cloud-to-ground variety. Negative CGs are more common than positive CGs. A lightning discharge between cloud and ground where the negative end of an in-cloud bidirectional leader descends to the ground via a downward-moving, negatively-charged stepped leader.
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