What is it about?
The new Geostationary Lightning Mapper on GOES 16/17 confirms that lightning “megaflashes” of >100 km horizontal extent may be rather common, including one presented here that extended to >500 km.
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Why is it important?
Some powerful lightning strikes can occur hundreds of kilometers from the active cores of the storms which spawn them,
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This page is a summary of: Megaflashes: Just How Long Can a Lightning Discharge Get?, Bulletin of the American Meteorological Society, January 2020, American Meteorological Society,
DOI: 10.1175/bams-d-19-0033.1.
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