Gall and Graves1 described a ground observation of a sudden brightening effect around the top of an active cumulonimbus cloud. Each brightening began concurrently with a lightning stroke in the main cloud mass and rippled upward and outward during a substantial fraction of a second.
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GRAVES, M., GALL, J. & VONNEGUT, B. Meteorological Phenomenon called Crown Flash. Nature 231, 258 (1971). https://doi.org/10.1038/231258a0