September 15, 2009 A powerful lightning storm in Saturn's atmosphere that began in mid-January 2009 has become the solar system's longest continuously observed thunderstorm. Wiki User Answered . What was the longest lightning storm ever? Longest lightning storm on Saturn breaks Solar System record 15 September 2009 Image of a lightning storm on Saturn. Credit: NASA/JPL/Space Science Institute The two record-setting lightning flashes, one over Brazil that's the longest ever documented, and another over Argentina that persisted longer than any observed before. (Credit: WMO) "These are extraordinary records from single lightning flash events," says the WMO's Randall Cerveny, quoted in a WMO release about the episodes. 15 16 17. Catatumbo lightning (Spanish: Relámpago del Catatumbo) is an atmospheric phenomenon which occurs over the mouth of the Catatumbo River where it empties into Lake Maracaibo in Venezuela.It originates from a mass of storm clouds at a height of more than 1 km, and occurs during 140 to 160 nights a year, 10 hours per day and up to 280 times per hour. It broke the … 2011-03-16 17:17:50 2011-03-16 17:17:50. Asked by Wiki User. Top Answer. “It was the longest disappearance of the lightning in 104 years,” said Quiroga, who blamed a drought caused by 2009’s especially strong El Niño. Answer. A powerful lightning storm in Saturn’s atmosphere that began in mid-January 2009 has become the Solar System’s longest continuously observed thunderstorm.