This was one of the longest single lightning channels I’ve ever seen to extend outside cloud, stretching for tens of miles across the sky, taking a couple seconds to complete its circuit, and reaching a substantial fraction of the distance groundward along the way. The massive and beautiful spark shot out beneath and between two well-separated areas of a severe squall line’s trailing precipitation region. This, and a relative concentration of lesser flashes, seemed to originate above (and emerge from) a patch of mammatus clouds, where vertical circulations in the upper levels may have been enhanced compared to the rest of the rear cloud shield.
2 W Davis OK (15 May 22) Looking SSW
34.503, -97.155