A World Meteorological Organization (WMO) committee of experts has established two new world records for the longest reported distance and the longest reported duration for a single lightning flash in, respectively, Brazil and Argentina. The greatest duration for a single lightning flash is 16.73 seconds from a flash that developed continuously over northern Argentina on March 4, 2019. (WMO)These are extraordinary records from single lightning flash events. These new instruments include the Geostationary Lightning Mappers (GLMs) on the R-series Geostationary Operational Environmental Satellites (GOES-16 and 17) that recorded the new lightning records, and their orbiting counterparts from Europe (the Meteosat Third Generation (MTG) Lightning Imager) and China (FY-4 Lightning Mapping Imager). Other previously accepted WMO lightning extremes are: